diff --git a/locale/circuitpython.pot b/locale/circuitpython.pot
index 3b7e6227fa..fd6df1cafe 100644
--- a/locale/circuitpython.pot
+++ b/locale/circuitpython.pot
@@ -66,13 +66,16 @@ msgid ""
 "%d address pins, %d rgb pins and %d tiles indicate a height of %d, not %d"
 msgstr ""
 
+#: ports/atmel-samd/common-hal/alarm/__init__.c
 #: ports/cxd56/common-hal/analogio/AnalogOut.c ports/cxd56/common-hal/rtc/RTC.c
 #: ports/espressif/common-hal/rtc/RTC.c
 #: ports/mimxrt10xx/common-hal/analogio/AnalogOut.c
-#: ports/mimxrt10xx/common-hal/rtc/RTC.c
+#: ports/mimxrt10xx/common-hal/rtc/RTC.c ports/nrf/common-hal/alarm/__init__.c
 #: ports/nrf/common-hal/analogio/AnalogOut.c ports/nrf/common-hal/rtc/RTC.c
+#: ports/raspberrypi/common-hal/alarm/__init__.c
 #: ports/raspberrypi/common-hal/analogio/AnalogOut.c
-#: ports/raspberrypi/common-hal/rtc/RTC.c ports/stm/common-hal/rtc/RTC.c
+#: ports/raspberrypi/common-hal/rtc/RTC.c ports/stm/common-hal/alarm/__init__.c
+#: ports/stm/common-hal/rtc/RTC.c
 msgid "%q"
 msgstr ""
 
@@ -902,13 +905,14 @@ msgstr ""
 
 #: ports/raspberrypi/bindings/rp2pio/StateMachine.c py/enum.c
 #: shared-bindings/_bleio/__init__.c shared-bindings/aesio/aes.c
-#: shared-bindings/busio/SPI.c shared-bindings/microcontroller/Pin.c
+#: shared-bindings/alarm/__init__.c shared-bindings/busio/SPI.c
+#: shared-bindings/microcontroller/Pin.c
 #: shared-bindings/neopixel_write/__init__.c
 msgid "Expected a %q"
 msgstr ""
 
 #: shared-bindings/alarm/__init__.c
-msgid "Expected an alarm"
+msgid "Expected an %q"
 msgstr ""
 
 #: ports/espressif/common-hal/_bleio/Adapter.c
@@ -3798,6 +3802,7 @@ msgstr ""
 #: ports/espressif/boards/adafruit_qtpy_esp32c3/mpconfigboard.h
 #: ports/espressif/boards/beetle-esp32-c3/mpconfigboard.h
 #: ports/espressif/boards/lolin_c3_mini/mpconfigboard.h
+#: ports/espressif/boards/microdev_micro_c3/mpconfigboard.h
 #: supervisor/shared/safe_mode.c
 msgid "pressing boot button at start up.\n"
 msgstr ""
diff --git a/ports/atmel-samd/common-hal/alarm/__init__.c b/ports/atmel-samd/common-hal/alarm/__init__.c
index 405bf9d573..8f66b3a90c 100644
--- a/ports/atmel-samd/common-hal/alarm/__init__.c
+++ b/ports/atmel-samd/common-hal/alarm/__init__.c
@@ -142,7 +142,10 @@ mp_obj_t common_hal_alarm_light_sleep_until_alarms(size_t n_alarms, const mp_obj
     return wake_alarm;
 }
 
-void common_hal_alarm_set_deep_sleep_alarms(size_t n_alarms, const mp_obj_t *alarms) {
+void common_hal_alarm_set_deep_sleep_alarms(size_t n_alarms, const mp_obj_t *alarms, size_t n_dios, digitalio_digitalinout_obj_t **preserve_dios) {
+    if (n_dios > 0) {
+        mp_raise_NotImplementedError_varg(translate("%q"), MP_QSTR_preserve_dios);
+    }
     _setup_sleep_alarms(true, n_alarms, alarms);
 }
 
diff --git a/ports/espressif/boards/adafruit_feather_esp32_v2/board.c b/ports/espressif/boards/adafruit_feather_esp32_v2/board.c
index 22d51ef334..78341beb3b 100644
--- a/ports/espressif/boards/adafruit_feather_esp32_v2/board.c
+++ b/ports/espressif/boards/adafruit_feather_esp32_v2/board.c
@@ -31,17 +31,14 @@
 #include "components/hal/include/hal/gpio_hal.h"
 #include "common-hal/microcontroller/Pin.h"
 
-void board_init(void) {
-    reset_board();
-}
-
-void reset_board(void) {
-    // Turn on NeoPixel and I2C power by default.
-    gpio_set_direction(2, GPIO_MODE_DEF_OUTPUT);
-    gpio_set_level(2, true);
-}
-
 bool espressif_board_reset_pin_number(gpio_num_t pin_number) {
+    if (pin_number == 2) {
+        // Turn on NeoPixel and I2C power by default.
+        gpio_set_direction(pin_number, GPIO_MODE_DEF_OUTPUT);
+        gpio_set_level(pin_number, true);
+        return true;
+    }
+
     return false;
 }
 
diff --git a/ports/espressif/common-hal/alarm/SleepMemory.c b/ports/espressif/common-hal/alarm/SleepMemory.c
index 764125ddb2..d375fdc778 100644
--- a/ports/espressif/common-hal/alarm/SleepMemory.c
+++ b/ports/espressif/common-hal/alarm/SleepMemory.c
@@ -31,7 +31,6 @@
 #include "common-hal/alarm/SleepMemory.h"
 #include "shared-bindings/alarm/SleepMemory.h"
 
-#include "esp_log.h"
 #include "esp_sleep.h"
 
 // Data storage for singleton instance of SleepMemory.
@@ -39,7 +38,7 @@
 static RTC_DATA_ATTR uint8_t _sleep_mem[SLEEP_MEMORY_LENGTH];
 
 void alarm_sleep_memory_reset(void) {
-    // ESP-IDF build system takes care of doing esp_sleep_pd_config() or the equivalentwith
+    // ESP-IDF build system takes care of doing esp_sleep_pd_config() or the equivalent with
     // the correct settings, depending on which RTC mem we are using.
     // https://docs.espressif.com/projects/esp-idf/en/latest/esp32s2/api-reference/system/sleep_modes.html#power-down-of-rtc-peripherals-and-memories
 }
diff --git a/ports/espressif/common-hal/alarm/__init__.c b/ports/espressif/common-hal/alarm/__init__.c
index d65ab0bbb2..a47930850d 100644
--- a/ports/espressif/common-hal/alarm/__init__.c
+++ b/ports/espressif/common-hal/alarm/__init__.c
@@ -39,12 +39,15 @@
 #include "shared-bindings/wifi/__init__.h"
 #include "shared-bindings/microcontroller/__init__.h"
 
+#include "common-hal/digitalio/DigitalInOut.h"
+
 #include "supervisor/port.h"
 #include "supervisor/shared/workflow.h"
 
 #include "esp_sleep.h"
 
 #include "soc/rtc_cntl_reg.h"
+#include "components/driver/include/driver/gpio.h"
 #include "components/driver/include/driver/uart.h"
 
 // Singleton instance of SleepMemory.
@@ -158,7 +161,8 @@ mp_obj_t common_hal_alarm_light_sleep_until_alarms(size_t n_alarms, const mp_obj
     return wake_alarm;
 }
 
-void common_hal_alarm_set_deep_sleep_alarms(size_t n_alarms, const mp_obj_t *alarms) {
+void common_hal_alarm_set_deep_sleep_alarms(size_t n_alarms, const mp_obj_t *alarms, size_t n_dios, digitalio_digitalinout_obj_t *preserve_dios[]) {
+    digitalio_digitalinout_preserve_for_deep_sleep(n_dios, preserve_dios);
     _setup_sleep_alarms(true, n_alarms, alarms);
 }
 
@@ -166,6 +170,12 @@ void NORETURN common_hal_alarm_enter_deep_sleep(void) {
     alarm_pin_pinalarm_prepare_for_deep_sleep();
     alarm_touch_touchalarm_prepare_for_deep_sleep();
 
+    // We no longer need to remember the pin preservations, since any pin resets are all done.
+    clear_pin_preservations();
+
+    // Allow pin holds to work during deep sleep.
+    gpio_deep_sleep_hold_en();
+
     // The ESP-IDF caches the deep sleep settings and applies them before sleep.
     // We don't need to worry about resetting them in the interim.
     esp_deep_sleep_start();
diff --git a/ports/espressif/common-hal/digitalio/DigitalInOut.c b/ports/espressif/common-hal/digitalio/DigitalInOut.c
index a3e8f41147..63c8ec1a41 100644
--- a/ports/espressif/common-hal/digitalio/DigitalInOut.c
+++ b/ports/espressif/common-hal/digitalio/DigitalInOut.c
@@ -32,6 +32,20 @@
 
 #include "components/hal/include/hal/gpio_hal.h"
 
+STATIC bool _pin_is_input(uint8_t pin_number) {
+    const uint32_t iomux = READ_PERI_REG(GPIO_PIN_MUX_REG[pin_number]);
+    return (iomux & FUN_IE) != 0;
+}
+
+void digitalio_digitalinout_preserve_for_deep_sleep(size_t n_dios, digitalio_digitalinout_obj_t *preserve_dios[]) {
+    // Mark the pin states of the given DigitalInOuts for preservation during deep sleep
+    for (size_t i = 0; i < n_dios; i++) {
+        if (!common_hal_digitalio_digitalinout_deinited(preserve_dios[i])) {
+            preserve_pin_number(preserve_dios[i]->pin->number);
+        }
+    }
+}
+
 void common_hal_digitalio_digitalinout_never_reset(
     digitalio_digitalinout_obj_t *self) {
     never_reset_pin_number(self->pin->number);
@@ -83,8 +97,7 @@ digitalinout_result_t common_hal_digitalio_digitalinout_switch_to_output(
 
 digitalio_direction_t common_hal_digitalio_digitalinout_get_direction(
     digitalio_digitalinout_obj_t *self) {
-    uint32_t iomux = READ_PERI_REG(GPIO_PIN_MUX_REG[self->pin->number]);
-    if ((iomux & FUN_IE) != 0) {
+    if (_pin_is_input(self->pin->number)) {
         return DIRECTION_INPUT;
     }
     return DIRECTION_OUTPUT;
diff --git a/ports/espressif/common-hal/digitalio/DigitalInOut.h b/ports/espressif/common-hal/digitalio/DigitalInOut.h
index 2d42e79809..793d2a0986 100644
--- a/ports/espressif/common-hal/digitalio/DigitalInOut.h
+++ b/ports/espressif/common-hal/digitalio/DigitalInOut.h
@@ -36,4 +36,6 @@ typedef struct {
     bool output_value;
 } digitalio_digitalinout_obj_t;
 
+extern void digitalio_digitalinout_preserve_for_deep_sleep(size_t n_dios, digitalio_digitalinout_obj_t *preserve_dios[]);
+
 #endif // MICROPY_INCLUDED_ESPRESSIF_COMMON_HAL_DIGITALIO_DIGITALINOUT_H
diff --git a/ports/espressif/common-hal/esp32_camera/Camera.c b/ports/espressif/common-hal/esp32_camera/Camera.c
index 97300a639c..5ee112a911 100644
--- a/ports/espressif/common-hal/esp32_camera/Camera.c
+++ b/ports/espressif/common-hal/esp32_camera/Camera.c
@@ -191,8 +191,6 @@ framesize_t common_hal_esp32_camera_camera_get_frame_size(esp32_camera_camera_ob
     return self->camera_config.frame_size;
 }
 
-#include "esp_log.h"
-
 void common_hal_esp32_camera_camera_reconfigure(esp32_camera_camera_obj_t *self, framesize_t frame_size, pixformat_t pixel_format, camera_grab_mode_t grab_mode, mp_int_t framebuffer_count) {
     sensor_t *sensor = esp_camera_sensor_get();
     camera_sensor_info_t *sensor_info = esp_camera_sensor_get_info(&sensor->id);
diff --git a/ports/espressif/common-hal/microcontroller/Pin.c b/ports/espressif/common-hal/microcontroller/Pin.c
index 127505f0e9..adc1e8b918 100644
--- a/ports/espressif/common-hal/microcontroller/Pin.c
+++ b/ports/espressif/common-hal/microcontroller/Pin.c
@@ -33,14 +33,13 @@
 #include "components/driver/include/driver/gpio.h"
 #include "components/hal/include/hal/gpio_hal.h"
 
-STATIC uint64_t never_reset_pins;
-STATIC uint64_t in_use;
+STATIC uint64_t _never_reset_pin_mask;
+STATIC uint64_t _preserved_pin_mask;
+STATIC uint64_t _in_use_pin_mask;
 
-// 64-bit pin mask for a single bit
-#define PIN_BIT(pin_number) (((uint64_t)1) << pin_number)
-
-// Bit mask of all pins that should never ever be reset.
+// Bit mask of all pins that should never EVER be reset.
 // Typically these are SPI flash and PSRAM control pins, and communication pins.
+// "Reset forbidden" is stronger than "never reset" below, which may only be temporary.
 static const uint64_t pin_mask_reset_forbidden =
     #if defined(CONFIG_IDF_TARGET_ESP32)
     // Never ever reset serial pins for bootloader and possibly USB-serial converter.
@@ -105,7 +104,7 @@ void never_reset_pin_number(gpio_num_t pin_number) {
     if (pin_number == NO_PIN || pin_number == (uint8_t)NO_PIN) {
         return;
     }
-    never_reset_pins |= PIN_BIT(pin_number);
+    _never_reset_pin_mask |= PIN_BIT(pin_number);
 }
 
 void common_hal_never_reset_pin(const mcu_pin_obj_t *pin) {
@@ -119,12 +118,29 @@ MP_WEAK bool espressif_board_reset_pin_number(gpio_num_t pin_number) {
     return false;
 }
 
+STATIC bool _reset_forbidden(gpio_num_t pin_number) {
+    return pin_mask_reset_forbidden & PIN_BIT(pin_number);
+}
+
+STATIC bool _never_reset(gpio_num_t pin_number) {
+    return _never_reset_pin_mask & PIN_BIT(pin_number);
+}
+
+STATIC bool _preserved_pin(gpio_num_t pin_number) {
+    return _preserved_pin_mask & PIN_BIT(pin_number);
+}
+
 STATIC void _reset_pin(gpio_num_t pin_number) {
     // Never ever reset pins used for flash, RAM, and basic communication.
-    if (pin_mask_reset_forbidden & PIN_BIT(pin_number)) {
+    if (_reset_forbidden(pin_number)) {
         return;
     }
 
+    // Disable any existing hold on this pin,
+    if (GPIO_IS_VALID_OUTPUT_GPIO(pin_number)) {
+        gpio_hold_dis(pin_number);
+    }
+
     // Give the board a chance to reset the pin in a particular way.
     if (espressif_board_reset_pin_number(pin_number)) {
         return;
@@ -152,6 +168,18 @@ STATIC void _reset_pin(gpio_num_t pin_number) {
     }
 }
 
+void preserve_pin_number(gpio_num_t pin_number) {
+    if (GPIO_IS_VALID_OUTPUT_GPIO(pin_number)) {
+        gpio_hold_en(pin_number);
+        _preserved_pin_mask |= PIN_BIT(pin_number);
+    }
+}
+
+void clear_pin_preservations(void) {
+    _preserved_pin_mask = 0;
+}
+
+
 // Mark pin as free and return it to a quiescent state.
 void reset_pin_number(gpio_num_t pin_number) {
     // Some CircuitPython APIs deal in uint8_t pin numbers, but NO_PIN is -1.
@@ -159,8 +187,8 @@ void reset_pin_number(gpio_num_t pin_number) {
     if (pin_number == NO_PIN || pin_number == (uint8_t)NO_PIN) {
         return;
     }
-    never_reset_pins &= ~PIN_BIT(pin_number);
-    in_use &= ~PIN_BIT(pin_number);
+    _never_reset_pin_mask &= ~PIN_BIT(pin_number);
+    _in_use_pin_mask &= ~PIN_BIT(pin_number);
 
     _reset_pin(pin_number);
 }
@@ -177,15 +205,20 @@ void common_hal_reset_pin(const mcu_pin_obj_t *pin) {
 }
 
 void reset_all_pins(void) {
+    // Undo deep sleep holds in case we woke up from deep sleep.
+    // We still need to unhold individual pins, which is done by _reset_pin.
+    gpio_deep_sleep_hold_dis();
+
     for (uint8_t i = 0; i < GPIO_PIN_COUNT; i++) {
         uint32_t iomux_address = GPIO_PIN_MUX_REG[i];
         if (iomux_address == 0 ||
-            (never_reset_pins & PIN_BIT(i))) {
+            _never_reset(i) ||
+            _preserved_pin(i)) {
             continue;
         }
         _reset_pin(i);
     }
-    in_use = never_reset_pins;
+    _in_use_pin_mask = _never_reset_pin_mask;
 }
 
 void claim_pin_number(gpio_num_t pin_number) {
@@ -194,7 +227,7 @@ void claim_pin_number(gpio_num_t pin_number) {
     if (pin_number == NO_PIN || pin_number == (uint8_t)NO_PIN) {
         return;
     }
-    in_use |= PIN_BIT(pin_number);
+    _in_use_pin_mask |= PIN_BIT(pin_number);
 }
 
 void claim_pin(const mcu_pin_obj_t *pin) {
@@ -206,7 +239,7 @@ void common_hal_mcu_pin_claim(const mcu_pin_obj_t *pin) {
 }
 
 bool pin_number_is_free(gpio_num_t pin_number) {
-    return !(in_use & PIN_BIT(pin_number));
+    return !(_in_use_pin_mask & PIN_BIT(pin_number));
 }
 
 bool common_hal_mcu_pin_is_free(const mcu_pin_obj_t *pin) {
diff --git a/ports/espressif/common-hal/microcontroller/Pin.h b/ports/espressif/common-hal/microcontroller/Pin.h
index e74346ef65..55927fe068 100644
--- a/ports/espressif/common-hal/microcontroller/Pin.h
+++ b/ports/espressif/common-hal/microcontroller/Pin.h
@@ -31,21 +31,28 @@
 
 #include "peripherals/pins.h"
 
-void reset_all_pins(void);
+// 64-bit pin mask for a single bit
+#define PIN_BIT(pin_number) (((uint64_t)1) << pin_number)
+
+extern void common_hal_reset_pin(const mcu_pin_obj_t *pin);
+extern void common_hal_never_reset_pin(const mcu_pin_obj_t *pin);
+
+extern void reset_all_pins(void);
 // reset_pin_number takes the pin number instead of the pointer so that objects don't
 // need to store a full pointer.
-void reset_pin_number(gpio_num_t pin_number);
-void common_hal_reset_pin(const mcu_pin_obj_t *pin);
-void common_hal_never_reset_pin(const mcu_pin_obj_t *pin);
-void claim_pin(const mcu_pin_obj_t *pin);
-void claim_pin_number(gpio_num_t pin_number);
-bool pin_number_is_free(gpio_num_t pin_number);
-void never_reset_pin_number(gpio_num_t pin_number);
+extern void reset_pin_number(gpio_num_t pin_number);
+extern void claim_pin(const mcu_pin_obj_t *pin);
+extern void claim_pin_number(gpio_num_t pin_number);
+extern bool pin_number_is_free(gpio_num_t pin_number);
+extern void never_reset_pin_number(gpio_num_t pin_number);
+
+extern void preserve_pin_number(gpio_num_t pin_number);
+extern void clear_pin_preservations(void);
 
 // Allow the board to reset a pin in a board-specific way. This can be used
 // for LEDs or enable pins to put them in a state beside the default pull-up.
 // Return true to indicate that the pin was reset. Returning false will lead to
 // the port-default reset behavior.
-bool espressif_board_reset_pin_number(gpio_num_t pin_number);
+extern bool espressif_board_reset_pin_number(gpio_num_t pin_number);
 
 #endif // MICROPY_INCLUDED_ESPRESSIF_COMMON_HAL_MICROCONTROLLER_PIN_H
diff --git a/ports/nrf/common-hal/alarm/__init__.c b/ports/nrf/common-hal/alarm/__init__.c
index 043be0b319..75f616c805 100644
--- a/ports/nrf/common-hal/alarm/__init__.c
+++ b/ports/nrf/common-hal/alarm/__init__.c
@@ -247,7 +247,10 @@ mp_obj_t common_hal_alarm_light_sleep_until_alarms(size_t n_alarms, const mp_obj
     return wake_alarm;
 }
 
-void common_hal_alarm_set_deep_sleep_alarms(size_t n_alarms, const mp_obj_t *alarms) {
+void common_hal_alarm_set_deep_sleep_alarms(size_t n_alarms, const mp_obj_t *alarms, size_t n_dios, digitalio_digitalinout_obj_t **preserve_dios) {
+    if (n_dios > 0) {
+        mp_raise_NotImplementedError_varg(translate("%q"), MP_QSTR_preserve_dios);
+    }
     _setup_sleep_alarms(true, n_alarms, alarms);
 }
 
diff --git a/ports/raspberrypi/common-hal/alarm/__init__.c b/ports/raspberrypi/common-hal/alarm/__init__.c
index 0d6734568b..31fa58aab3 100644
--- a/ports/raspberrypi/common-hal/alarm/__init__.c
+++ b/ports/raspberrypi/common-hal/alarm/__init__.c
@@ -194,7 +194,10 @@ mp_obj_t common_hal_alarm_light_sleep_until_alarms(size_t n_alarms, const mp_obj
     return wake_alarm;
 }
 
-void common_hal_alarm_set_deep_sleep_alarms(size_t n_alarms, const mp_obj_t *alarms) {
+void common_hal_alarm_set_deep_sleep_alarms(size_t n_alarms, const mp_obj_t *alarms, size_t n_dios, digitalio_digitalinout_obj_t **preserve_dios) {
+    if (n_dios > 0) {
+        mp_raise_NotImplementedError_varg(translate("%q"), MP_QSTR_preserve_dios);
+    }
     _setup_sleep_alarms(true, n_alarms, alarms);
 }
 
diff --git a/ports/stm/common-hal/alarm/__init__.c b/ports/stm/common-hal/alarm/__init__.c
index 466c2d5199..26099b0503 100644
--- a/ports/stm/common-hal/alarm/__init__.c
+++ b/ports/stm/common-hal/alarm/__init__.c
@@ -144,7 +144,10 @@ mp_obj_t common_hal_alarm_light_sleep_until_alarms(size_t n_alarms, const mp_obj
     return wake_alarm;
 }
 
-void common_hal_alarm_set_deep_sleep_alarms(size_t n_alarms, const mp_obj_t *alarms) {
+void common_hal_alarm_set_deep_sleep_alarms(size_t n_alarms, const mp_obj_t *alarms, size_t n_dios, digitalio_digitalinout_obj_t **preserve_dios) {
+    if (n_dios > 0) {
+        mp_raise_NotImplementedError_varg(translate("%q"), MP_QSTR_preserve_dios);
+    }
     _setup_sleep_alarms(true, n_alarms, alarms);
 }
 
diff --git a/ports/stm/supervisor/port.c b/ports/stm/supervisor/port.c
index b15d81611e..c3f1fee190 100644
--- a/ports/stm/supervisor/port.c
+++ b/ports/stm/supervisor/port.c
@@ -244,6 +244,7 @@ void SysTick_Handler(void) {
 
 void reset_port(void) {
     reset_all_pins();
+
     #if CIRCUITPY_RTC
     rtc_reset();
     #endif
diff --git a/shared-bindings/alarm/__init__.c b/shared-bindings/alarm/__init__.c
index 7fd14b7641..3b81dd479f 100644
--- a/shared-bindings/alarm/__init__.c
+++ b/shared-bindings/alarm/__init__.c
@@ -32,6 +32,7 @@
 #include "shared-bindings/alarm/pin/PinAlarm.h"
 #include "shared-bindings/alarm/time/TimeAlarm.h"
 #include "shared-bindings/alarm/touch/TouchAlarm.h"
+#include "shared-bindings/digitalio/DigitalInOut.h"
 #include "shared-bindings/supervisor/Runtime.h"
 #include "shared-bindings/time/__init__.h"
 #include "supervisor/shared/workflow.h"
@@ -80,7 +81,7 @@ STATIC void validate_objs_are_alarms(size_t n_args, const mp_obj_t *objs) {
             mp_obj_is_type(objs[i], &alarm_touch_touchalarm_type)) {
             continue;
         }
-        mp_raise_TypeError_varg(translate("Expected an alarm"));
+        mp_raise_TypeError_varg(translate("Expected an %q"), MP_QSTR_Alarm);
     }
 }
 
@@ -112,7 +113,7 @@ STATIC mp_obj_t alarm_light_sleep_until_alarms(size_t n_args, const mp_obj_t *ar
 }
 MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(alarm_light_sleep_until_alarms_obj, 1, MP_OBJ_FUN_ARGS_MAX, alarm_light_sleep_until_alarms);
 
-//| def exit_and_deep_sleep_until_alarms(*alarms: circuitpython_typing.Alarm) -> None:
+//| def exit_and_deep_sleep_until_alarms(*alarms: circuitpython_typing.Alarm, preserve_dios: Sequence[digitalio.DigitalInOut] = ()) -> None:
 //|     """Exit the program and go into a deep sleep, until awakened by one of the alarms.
 //|     This function does not return.
 //|
@@ -126,6 +127,22 @@ MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(alarm_light_sleep_until_alarms_obj, 1, MP_OB
 //|
 //|     If no alarms are specified, the microcontroller will deep sleep until reset.
 //|
+//|     :param circuitpython_typing.Alarm alarms: the alarms that can wake the microcontroller.
+//|     :param Sequence[digitalio.DigitalInOut] preserve_dios: A sequence of `DigitalInOut` objects
+//|       whose state should be preserved during deep sleep.
+//|       If a `DigitalInOut` in the sequence is set to be an output,
+//|       its current `DigitalInOut.value` (``True`` or ``False``)
+//|       will be preserved during the deep sleep.
+//|       If a `DigitalInOut` in the sequence is set to be an input,
+//|       its current `DigitalInOut.pull` value (``DOWN``, ``UP``, or ``None``)
+//|       will be preserved during deep sleep.
+//|
+//|     Preserving `DigitalInOut` states during deep sleep can be used to ensure that
+//|     external or on-board devices are powered or unpowered during sleep, among other purposes.
+//|
+//|     On some microcontrollers, some pins cannot remain in their original state for hardware reasons.
+//|
+//|
 //|     **If CircuitPython is connected to a host computer via USB or BLE
 //|     the first time a deep sleep is requested,
 //|     the connection will be maintained and the system will not go into deep sleep.**
@@ -136,28 +153,50 @@ MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(alarm_light_sleep_until_alarms_obj, 1, MP_OB
 //|     the next deep sleep will still be a true deep sleep. You must do a hard reset
 //|     or power-cycle to exit a true deep sleep loop.
 //|
-//|     Here is skeletal example that deep-sleeps and restarts every 60 seconds:
+//|     Here is a skeletal example:
 //|
 //|     .. code-block:: python
 //|
 //|         import alarm
 //|         import time
+//|         import board
 //|
 //|         print("Waking up")
 //|
-//|         # Set an alarm for 60 seconds from now.
+//|         # Create an alarm for 60 seconds from now, and also a pin alarm.
 //|         time_alarm = alarm.time.TimeAlarm(monotonic_time=time.monotonic() + 60)
+//|         pin_alarm = alarm.pin.PinAlarm(board.D7, False)
 //|
-//|         # Deep sleep until the alarm goes off. Then restart the program.
-//|         alarm.exit_and_deep_sleep_until_alarms(time_alarm)
+//|         # Deep sleep until one of the alarm goes off. Then restart the program.
+//|         alarm.exit_and_deep_sleep_until_alarms(time_alarm, pin_alarm)
 //|     """
 //|     ...
 //|
-STATIC mp_obj_t alarm_exit_and_deep_sleep_until_alarms(size_t n_args, const mp_obj_t *args) {
-    validate_objs_are_alarms(n_args, args);
+STATIC mp_obj_t alarm_exit_and_deep_sleep_until_alarms(size_t n_args, const mp_obj_t *pos_args, mp_map_t *kw_args) {
+    enum { ARG_preserve_dios };
+    static const mp_arg_t allowed_args[] = {
+        { MP_QSTR_preserve_dios, MP_ARG_KW_ONLY | MP_ARG_OBJ, {.u_obj = mp_const_empty_tuple} },
+    };
 
-    // Validate the alarms and set them.
-    common_hal_alarm_set_deep_sleep_alarms(n_args, args);
+    // args will contain only the value for preserve_dios. The *alarms args are in pos_args.
+    mp_arg_val_t args[MP_ARRAY_SIZE(allowed_args)];
+    mp_arg_parse_all(0, pos_args, kw_args, MP_ARRAY_SIZE(allowed_args), allowed_args, args);
+
+    validate_objs_are_alarms(n_args, pos_args);
+
+    mp_obj_t preserve_dios = args[ARG_preserve_dios].u_obj;
+    const size_t num_dios = (size_t)MP_OBJ_SMALL_INT_VALUE(mp_obj_len(preserve_dios));
+    digitalio_digitalinout_obj_t *dios_array[num_dios];
+
+    for (mp_uint_t i = 0; i < num_dios; i++) {
+        mp_obj_t dio = mp_obj_subscr(preserve_dios, MP_OBJ_NEW_SMALL_INT(i), MP_OBJ_SENTINEL);
+        if (!mp_obj_is_type(dio, &digitalio_digitalinout_type)) {
+            mp_raise_TypeError_varg(translate("Expected a %q"), MP_QSTR_DigitalInOut);
+        }
+        dios_array[i] = MP_OBJ_TO_PTR(dio);
+    }
+
+    common_hal_alarm_set_deep_sleep_alarms(n_args, pos_args, num_dios, dios_array);
 
     // Raise an exception, which will be processed in main.c.
     mp_raise_type_arg(&mp_type_DeepSleepRequest, NULL);
@@ -165,7 +204,7 @@ STATIC mp_obj_t alarm_exit_and_deep_sleep_until_alarms(size_t n_args, const mp_o
     // Doesn't get here.
     return mp_const_none;
 }
-MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(alarm_exit_and_deep_sleep_until_alarms_obj, 1, MP_OBJ_FUN_ARGS_MAX, alarm_exit_and_deep_sleep_until_alarms);
+MP_DEFINE_CONST_FUN_OBJ_KW(alarm_exit_and_deep_sleep_until_alarms_obj, 0, alarm_exit_and_deep_sleep_until_alarms);
 
 STATIC const mp_map_elem_t alarm_pin_globals_table[] = {
     { MP_ROM_QSTR(MP_QSTR___name__), MP_ROM_QSTR(MP_QSTR_pin) },
diff --git a/shared-bindings/alarm/__init__.h b/shared-bindings/alarm/__init__.h
index eb67917dce..ea86e44f2f 100644
--- a/shared-bindings/alarm/__init__.h
+++ b/shared-bindings/alarm/__init__.h
@@ -30,6 +30,7 @@
 #include "py/obj.h"
 
 #include "common-hal/alarm/__init__.h"
+#include "common-hal/digitalio/DigitalInOut.h"
 
 // Light sleep fully self-contained and does not exit user code. It will return
 // the same alarm object that was orignally passed in, unlike deep sleep, which
@@ -42,7 +43,7 @@ extern mp_obj_t common_hal_alarm_light_sleep_until_alarms(size_t n_alarms, const
 // supervisor will idle using `port_wait_for_interrupt`. After each call, it will
 // call alarm_woken_from_sleep to see if we've been woken by an alarm and if so,
 // it will exit idle as if deep sleep was exited
-extern void common_hal_alarm_set_deep_sleep_alarms(size_t n_alarms, const mp_obj_t *alarms);
+extern void common_hal_alarm_set_deep_sleep_alarms(size_t n_alarms, const mp_obj_t *alarms, size_t n_dios, digitalio_digitalinout_obj_t **preserve_dios);
 
 extern NORETURN void common_hal_alarm_enter_deep_sleep(void);
 
diff --git a/shared-bindings/dualbank/__init__.c b/shared-bindings/dualbank/__init__.c
index f907c91e0e..fa4c2af691 100644
--- a/shared-bindings/dualbank/__init__.c
+++ b/shared-bindings/dualbank/__init__.c
@@ -56,7 +56,7 @@
 //| ...
 //|
 
-//| def flash(*buffer: ReadableBuffer, offset: int=0) -> None:
+//| def flash(buffer: ReadableBuffer, offset: int=0) -> None:
 //|     """Writes one of two app partitions at the given offset.
 //|
 //|     This can be called multiple times when flashing the firmware
diff --git a/shared/runtime/pyexec.c b/shared/runtime/pyexec.c
index 72714b9a2b..87219d18f5 100644
--- a/shared/runtime/pyexec.c
+++ b/shared/runtime/pyexec.c
@@ -168,17 +168,21 @@ STATIC int parse_compile_execute(const void *source, mp_parse_input_kind_t input
         }
 
         // check for SystemExit
-        if (mp_obj_is_subclass_fast(MP_OBJ_FROM_PTR(mp_obj_get_type((mp_obj_t)nlr.ret_val)), MP_OBJ_FROM_PTR(&mp_type_SystemExit))) {
+
+        // nlr.ret_val is an exception object.
+        mp_obj_t exception_obj = (mp_obj_t)nlr.ret_val;
+
+        if (mp_obj_is_subclass_fast(MP_OBJ_FROM_PTR(mp_obj_get_type(exception_obj)), MP_OBJ_FROM_PTR(&mp_type_SystemExit))) {
             // at the moment, the value of SystemExit is unused
             ret = pyexec_system_exit;
         #if CIRCUITPY_ALARM
-        } else if (mp_obj_is_subclass_fast(MP_OBJ_FROM_PTR(mp_obj_get_type((mp_obj_t)nlr.ret_val)), &mp_type_DeepSleepRequest)) {
+        } else if (mp_obj_is_subclass_fast(MP_OBJ_FROM_PTR(mp_obj_get_type(exception_obj)), MP_OBJ_FROM_PTR(&mp_type_DeepSleepRequest))) {
             ret = PYEXEC_DEEP_SLEEP;
         #endif
-        } else if ((mp_obj_t)nlr.ret_val == MP_OBJ_FROM_PTR(&MP_STATE_VM(mp_reload_exception))) {
+        } else if (exception_obj == MP_OBJ_FROM_PTR(&MP_STATE_VM(mp_reload_exception))) {
             ret = PYEXEC_RELOAD;
         } else {
-            mp_obj_print_exception(&mp_plat_print, MP_OBJ_FROM_PTR(nlr.ret_val));
+            mp_obj_print_exception(&mp_plat_print, exception_obj);
             ret = PYEXEC_EXCEPTION;
         }