diff --git a/ports/mimxrt10xx/boards/imxrt1010_evk/board.c b/ports/mimxrt10xx/boards/imxrt1010_evk/board.c
index c5237c8a8e..9c7f4a256f 100644
--- a/ports/mimxrt10xx/boards/imxrt1010_evk/board.c
+++ b/ports/mimxrt10xx/boards/imxrt1010_evk/board.c
@@ -41,9 +41,6 @@ const mcu_pin_obj_t *mimxrt10xx_reset_forbidden_pins[] = {
     &pin_GPIO_SD_08,
     &pin_GPIO_SD_07,
     &pin_GPIO_SD_06,
-    // USB Pins
-    &pin_USB_OTG1_DN,
-    &pin_USB_OTG1_DP,
     NULL,                       // Must end in NULL.
 };
 
diff --git a/ports/mimxrt10xx/boards/imxrt1015_evk/board.c b/ports/mimxrt10xx/boards/imxrt1015_evk/board.c
index 568945a3eb..06b3dd22d5 100644
--- a/ports/mimxrt10xx/boards/imxrt1015_evk/board.c
+++ b/ports/mimxrt10xx/boards/imxrt1015_evk/board.c
@@ -40,9 +40,6 @@ const mcu_pin_obj_t *mimxrt10xx_reset_forbidden_pins[] = {
     &pin_GPIO_SD_B1_09,
     &pin_GPIO_SD_B1_10,
     &pin_GPIO_SD_B1_11,
-    // USB Pins
-    &pin_USB_OTG1_DN,
-    &pin_USB_OTG1_DP,
     NULL,                       // Must end in NULL.
 };
 
diff --git a/ports/mimxrt10xx/boards/imxrt1020_evk/board.c b/ports/mimxrt10xx/boards/imxrt1020_evk/board.c
index f814afd956..540e416525 100644
--- a/ports/mimxrt10xx/boards/imxrt1020_evk/board.c
+++ b/ports/mimxrt10xx/boards/imxrt1020_evk/board.c
@@ -42,10 +42,6 @@ const mcu_pin_obj_t *mimxrt10xx_reset_forbidden_pins[] = {
     &pin_GPIO_SD_B1_09,
     &pin_GPIO_SD_B1_10,
     &pin_GPIO_SD_B1_11,
-
-    // USB Pins
-    &pin_USB_OTG1_DN,
-    &pin_USB_OTG1_DP,
     NULL,                       // Must end in NULL.
 };
 
diff --git a/ports/mimxrt10xx/boards/imxrt1040_evk/board.c b/ports/mimxrt10xx/boards/imxrt1040_evk/board.c
index 0e97d87b60..6ab54be8a6 100644
--- a/ports/mimxrt10xx/boards/imxrt1040_evk/board.c
+++ b/ports/mimxrt10xx/boards/imxrt1040_evk/board.c
@@ -44,9 +44,6 @@ const mcu_pin_obj_t *mimxrt10xx_reset_forbidden_pins[] = {
     &pin_GPIO_SD_B1_10,
     &pin_GPIO_SD_B1_11,
 
-    &pin_USB_OTG1_DN,
-    &pin_USB_OTG1_DP,
-
     NULL,                       // Must end in NULL.
 };
 
diff --git a/ports/mimxrt10xx/boards/imxrt1050_evkb/board.c b/ports/mimxrt10xx/boards/imxrt1050_evkb/board.c
index 8a34fc4210..6e31888c53 100644
--- a/ports/mimxrt10xx/boards/imxrt1050_evkb/board.c
+++ b/ports/mimxrt10xx/boards/imxrt1050_evkb/board.c
@@ -45,8 +45,8 @@ const mcu_pin_obj_t *mimxrt10xx_reset_forbidden_pins[] = {
     &pin_GPIO_SD_B1_11,
 
     // USB Pins
-    &pin_GPIO_AD_B0_01,
-    &pin_GPIO_AD_B0_03,
+    &pin_GPIO_AD_B0_01, // ID Pin
+    &pin_GPIO_AD_B0_03, // OC/Fault Pin
     NULL,                       // Must end in NULL.
 };
 
diff --git a/ports/mimxrt10xx/boards/imxrt1060_evk/board.c b/ports/mimxrt10xx/boards/imxrt1060_evk/board.c
index f27f549c64..4a2e6e0913 100644
--- a/ports/mimxrt10xx/boards/imxrt1060_evk/board.c
+++ b/ports/mimxrt10xx/boards/imxrt1060_evk/board.c
@@ -50,8 +50,8 @@ const mcu_pin_obj_t *mimxrt10xx_reset_forbidden_pins[] = {
     &pin_GPIO_SD_B1_11,
 
     // USB Pins
-    &pin_GPIO_AD_B0_01,
-    &pin_GPIO_AD_B0_03,
+    &pin_GPIO_AD_B0_01, // ID Pin
+    &pin_GPIO_AD_B0_03, // OC/Fault Pin
     NULL,                       // Must end in NULL.
 };
 
diff --git a/ports/mimxrt10xx/common-hal/microcontroller/Pin.c b/ports/mimxrt10xx/common-hal/microcontroller/Pin.c
index 9f9e306dd9..2cd53e9560 100644
--- a/ports/mimxrt10xx/common-hal/microcontroller/Pin.c
+++ b/ports/mimxrt10xx/common-hal/microcontroller/Pin.c
@@ -31,8 +31,8 @@
 
 #include "py/gc.h"
 
-STATIC bool claimed_pins[IOMUXC_SW_PAD_CTL_PAD_COUNT];
-STATIC bool never_reset_pins[IOMUXC_SW_PAD_CTL_PAD_COUNT];
+STATIC bool claimed_pins[PAD_COUNT];
+STATIC bool never_reset_pins[PAD_COUNT];
 
 // Default is that no pins are forbidden to reset.
 MP_WEAK const mcu_pin_obj_t *mimxrt10xx_reset_forbidden_pins[] = {
@@ -55,10 +55,10 @@ STATIC bool _reset_forbidden(const mcu_pin_obj_t *pin) {
 // and GPIO port and number, used to store claimed and reset tagging. The two number
 // systems are not related and one cannot determine the other without a pin object
 void reset_all_pins(void) {
-    for (uint8_t i = 0; i < IOMUXC_SW_PAD_CTL_PAD_COUNT; i++) {
+    for (uint8_t i = 0; i < PAD_COUNT; i++) {
         claimed_pins[i] = never_reset_pins[i];
     }
-    for (uint8_t i = 0; i < IOMUXC_SW_PAD_CTL_PAD_COUNT; i++) {
+    for (uint8_t i = 0; i < PAD_COUNT; i++) {
         mcu_pin_obj_t *pin = mcu_pin_globals.map.table[i].value;
         if (never_reset_pins[pin->mux_idx]) {
             continue;
@@ -90,6 +90,11 @@ void common_hal_reset_pin(const mcu_pin_obj_t *pin) {
     disable_pin_change_interrupt(pin);
     never_reset_pins[pin->mux_idx] = false;
     claimed_pins[pin->mux_idx] = false;
+
+    // This should never be true, but protect against it anyway.
+    if (pin->mux_reg == 0) {
+        return;
+    }
     *(uint32_t *)pin->mux_reg = pin->mux_reset;
     *(uint32_t *)pin->cfg_reg = pin->pad_reset;
 }
diff --git a/ports/mimxrt10xx/peripherals/mimxrt10xx/MIMXRT1011/pins.h b/ports/mimxrt10xx/peripherals/mimxrt10xx/MIMXRT1011/pins.h
index 8e901f0980..2b63b84ecb 100644
--- a/ports/mimxrt10xx/peripherals/mimxrt10xx/MIMXRT1011/pins.h
+++ b/ports/mimxrt10xx/peripherals/mimxrt10xx/MIMXRT1011/pins.h
@@ -40,5 +40,7 @@
 #include "pin_names.h"
 #undef FORMAT_PIN
 
-#define PIN_COUNT (IOMUXC_SW_PAD_CTL_PAD_COUNT + 2)
+// Pads can be reset. Other pins like USB cannot be.
+#define PAD_COUNT (43)
+#define PIN_COUNT (PAD_COUNT + 2)
 extern const mcu_pin_obj_t mcu_pin_list[PIN_COUNT];
diff --git a/ports/mimxrt10xx/peripherals/mimxrt10xx/MIMXRT1015/pins.h b/ports/mimxrt10xx/peripherals/mimxrt10xx/MIMXRT1015/pins.h
index 8655bf872f..9c66fc82f3 100644
--- a/ports/mimxrt10xx/peripherals/mimxrt10xx/MIMXRT1015/pins.h
+++ b/ports/mimxrt10xx/peripherals/mimxrt10xx/MIMXRT1015/pins.h
@@ -40,5 +40,7 @@
 #include "pin_names.h"
 #undef FORMAT_PIN
 
-#define PIN_COUNT (IOMUXC_SW_PAD_CTL_PAD_COUNT + 2)
+// Pads can be reset. Other pins like USB cannot be.
+#define PAD_COUNT (56)
+#define PIN_COUNT (PAD_COUNT + 2)
 extern const mcu_pin_obj_t mcu_pin_list[PIN_COUNT];
diff --git a/ports/mimxrt10xx/peripherals/mimxrt10xx/MIMXRT1021/pins.h b/ports/mimxrt10xx/peripherals/mimxrt10xx/MIMXRT1021/pins.h
index b4f991a879..5d4f992e89 100644
--- a/ports/mimxrt10xx/peripherals/mimxrt10xx/MIMXRT1021/pins.h
+++ b/ports/mimxrt10xx/peripherals/mimxrt10xx/MIMXRT1021/pins.h
@@ -40,5 +40,7 @@
 #include "pin_names.h"
 #undef FORMAT_PIN
 
-#define PIN_COUNT (IOMUXC_SW_PAD_CTL_PAD_COUNT + 2)
+// Pads can be reset. Other pins like USB cannot be.
+#define PAD_COUNT (93)
+#define PIN_COUNT (PAD_COUNT + 2)
 extern const mcu_pin_obj_t mcu_pin_list[PIN_COUNT];
diff --git a/ports/mimxrt10xx/peripherals/mimxrt10xx/MIMXRT1042/pins.h b/ports/mimxrt10xx/peripherals/mimxrt10xx/MIMXRT1042/pins.h
index f666962907..c62c0ecaa0 100644
--- a/ports/mimxrt10xx/peripherals/mimxrt10xx/MIMXRT1042/pins.h
+++ b/ports/mimxrt10xx/peripherals/mimxrt10xx/MIMXRT1042/pins.h
@@ -40,5 +40,7 @@
 #include "pin_names.h"
 #undef FORMAT_PIN
 
-#define PIN_COUNT (IOMUXC_SW_PAD_CTL_PAD_COUNT + 2)
+// Pads can be reset. Other pins like USB cannot be.
+#define PAD_COUNT (112)
+#define PIN_COUNT (PAD_COUNT + 2)
 extern const mcu_pin_obj_t mcu_pin_list[PIN_COUNT];
diff --git a/ports/mimxrt10xx/peripherals/mimxrt10xx/MIMXRT1052/pins.h b/ports/mimxrt10xx/peripherals/mimxrt10xx/MIMXRT1052/pins.h
index 4ee8d2ae28..e02f1208bd 100644
--- a/ports/mimxrt10xx/peripherals/mimxrt10xx/MIMXRT1052/pins.h
+++ b/ports/mimxrt10xx/peripherals/mimxrt10xx/MIMXRT1052/pins.h
@@ -40,5 +40,7 @@
 #include "pin_names.h"
 #undef FORMAT_PIN
 
-#define PIN_COUNT (IOMUXC_SW_PAD_CTL_PAD_COUNT + 4)
+// Pads can be reset. Other pins like USB cannot be.
+#define PAD_COUNT (124)
+#define PIN_COUNT (PAD_COUNT + 4)
 extern const mcu_pin_obj_t mcu_pin_list[PIN_COUNT];
diff --git a/ports/mimxrt10xx/peripherals/mimxrt10xx/MIMXRT1062/pins.h b/ports/mimxrt10xx/peripherals/mimxrt10xx/MIMXRT1062/pins.h
index 6f746f3b4c..135d9f9565 100644
--- a/ports/mimxrt10xx/peripherals/mimxrt10xx/MIMXRT1062/pins.h
+++ b/ports/mimxrt10xx/peripherals/mimxrt10xx/MIMXRT1062/pins.h
@@ -40,5 +40,7 @@
 #include "pin_names.h"
 #undef FORMAT_PIN
 
-#define PIN_COUNT (IOMUXC_SW_PAD_CTL_PAD_COUNT + 4)
+// Pads can be reset. Other pins like USB cannot be.
+#define PAD_COUNT (124)
+#define PIN_COUNT (PAD_COUNT + 4)
 extern const mcu_pin_obj_t mcu_pin_list[PIN_COUNT];
diff --git a/ports/mimxrt10xx/peripherals/mimxrt10xx/MIMXRT1176/pins.h b/ports/mimxrt10xx/peripherals/mimxrt10xx/MIMXRT1176/pins.h
index 35be6dd36e..786b0a248c 100644
--- a/ports/mimxrt10xx/peripherals/mimxrt10xx/MIMXRT1176/pins.h
+++ b/ports/mimxrt10xx/peripherals/mimxrt10xx/MIMXRT1176/pins.h
@@ -40,5 +40,7 @@
 #include "pin_names.h"
 #undef FORMAT_PIN
 
-#define PIN_COUNT (IOMUXC_SW_PAD_CTL_PAD_COUNT + 0)
+// Pads can be reset. Other pins like USB cannot be.
+#define PAD_COUNT (145)
+#define PIN_COUNT (PAD_COUNT + 0)
 extern const mcu_pin_obj_t mcu_pin_list[PIN_COUNT];
diff --git a/ports/mimxrt10xx/tools/gen_peripherals_data.py b/ports/mimxrt10xx/tools/gen_peripherals_data.py
index 4193ae7228..d87e9022b2 100644
--- a/ports/mimxrt10xx/tools/gen_peripherals_data.py
+++ b/ports/mimxrt10xx/tools/gen_peripherals_data.py
@@ -190,6 +190,7 @@ for device in devices:
             split_pin = name.split("_")
             pin_name = "_".join(split_pin[4:])
             if pin_name not in all_pins:
+                print("skip", pin_name)
                 continue
             gpio_base = "_".join(split_pin[4:-1])
 
@@ -278,7 +279,10 @@ for device in devices:
     pins_c.append("")
 
     pins_h.append("")
-    pins_h.append(f"#define PIN_COUNT (IOMUXC_SW_PAD_CTL_PAD_COUNT + {len(usb_pins)})")
+
+    pins_h.append("// Pads can be reset. Other pins like USB cannot be.")
+    pins_h.append(f"#define PAD_COUNT ({pin_number})")
+    pins_h.append(f"#define PIN_COUNT (PAD_COUNT + {len(usb_pins)})")
     pins_h.append(f"extern const mcu_pin_obj_t mcu_pin_list[PIN_COUNT];")
     pins_h.append("")