NXP K32W0x

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The K32W0x device family from NXP are ultra-low power, high performance Cortex-M4 based wireless microcontrollers.

On-Chip Memory Regions

The K32W0x series devices have an internal flash of 640 KiB size. The K32W041AM device has an additional 1MiB internal QSPI flash built in.

Instance Name Size (bytes) Memory region Devices
Internal flash 655360 0x00000000 - 0x0009FFFF K32W041, K32W041A, K32W041AM, K32W061
Internal QSPI flash 1048576 0x00000000 - 0x000FFFFF K32W041AM

Internal Flash

Supported Regions

The internal flash is divided into 3 different regions:

  • Reserved by flash controller (0x9F000 - 0x9FFFF)
  • Reserved by boot code (0x9DE00 - 0x9EFFF)
  • Application space (0x00000 - 0x9DDFF)

For now, the J-Link supports the application space, only.

Vector Table Remap

The first 512 bytes of the device (0x0000 - 0x01FF) can be mapped to flash, ROM or RAM. When using the J-Link flashloader, this region is mapped to flash. This is done on purpose as the device does not provide a mirror address for the first 512 bytes of flash thus without remapping, the J-Link could not program the first 512 bytes.

ECC flash

The flash seems to be ECC protected. Read fails for sectors with invalid ECC (e.g. erased sectors). In order to prevent errors when reading empty sectors, the DLL do neither perform a blank check nor a compare of the flash content before programming.

Internal QSPI Flash

The built in internal QSPI flash of the K32W041AM has a size of 1 MiB. The K32W041AM supports SPI flashes of sizes up to 4 MiB.


The device has a ROM code which needs to be run after reset. The J-Link halts the MCU after executing the ROM code but before starting the application.

Evaluation Boards

Example Application