K32W

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The K32W series device is a 32 bit dual core device with a Cortex-M4 core and a Cortex-M0 core. The default boot core (after reset) can be selected / configured in the so called "Flash Option" register (FOPT) which is part of the flash memory module (FTFE). The flash memory module can be accessed through both cores. Per default, all bits in the FOPT are set to 1 which means that the Cortex-M4 core is selected as boot core (BOOT_CORE) and the boot source (BOOT_SRC) is set to boot from Boot ROM.

Supported Devices

The J-Link software package includes full debug support, including flash programming support and thus support for the unlimited breakpoints in flash feature for the following devices from the Kinetis K32W series:

Part number Flash (MB) SRAM (KB)
K32W022S1M2VPJAT 1.25 384
K32W022S1M2VPJAR 1.25 384
K32W032S1M2VPJAT 1.25 384
K32W032S1M2VPJAR 1.25 384
K32W042S1M2VPJAT 1.25 384
K32W042S1M2VPJAR 1.25 384
K32W032S1M2CAVAR 1.25 384
K32W032S1M2CAVAZ 1.25 384
K32W042S1M2CAVAR 1.25 384
K32W042S1M2CAVAZ 1.25 384

Boot ROM

By default, MCU will boot from Boot ROM, in this case, it will take about 30 seconds to execute ROM code before jump to application code, this will make user think the application code can’t be executed while indeed just need some patient to wait. Alternatively, the MCU can be configured to boot from the internal flash directly instead of executing the boot ROM prior. To do so, the two BOOT_SRC bits in the FTFE_FOPT register needs to be set to 0 (boot from internal flash). This can be done by issuing the Program Index command (0x43) with the index of the FOPT register (0x84) as parameter. The register needs to be set to 0xFFFFF3FF. Below, an example how to access (program, read, erase) the FOPT register through the flash module using the J-Link Commander, is given:

Program the FOPT register

//
// Program the FOPT register to 0xFFFFF3FF in order to set boot source to boot from internal flash (Cortex-M4)
// Please note that the new configuration will become active after power-on-reset, only
//
w1 0x40023007 0x43  // FCCOB0: CMD_PROGRAM_ONCE (IFR)
w1 0x40023006 0x84  // FCCOB1: IFR Index of the FOPT
w1 0x40023005 0x00  // FCCOB2: Not used
w1 0x40023004 0x00  // FCCOB3: Not used
w1 0x4002300B 0xFF  // FCCOB4: Record byte 0 value --> FOPT (Bit31:Bit24)
w1 0x4002300A 0xFF  // FCCOB5: Record byte 1 value --> FOPT (Bit23:Bit16)
w1 0x40023009 0xF3  // FCCOB6: Record byte 2 value --> FOPT (Bit15:Bit8)
w1 0x40023008 0xFF  // FCCOB7: Record byte 3 value --> FOPT (Bit7:Bit0)
w1 0x40023000 0x80  // Trigger operation

Read the FOPT register

w1 0x40023007 0x41  // FCCOB0: CMD_READ_IFR
w1 0x40023006 0x84  // FCCOB1: IFR Index of the FOPT
w1 0x40023000 0x80  // Trigger operation
mem8 0x4002300B 1   // FCCOB4: Record byte 0 value --> FOPT (Bit31:Bit24)
mem8 0x4002300A 1   // FCCOB5: Record byte 1 value --> FOPT (Bit23:Bit16)
mem8 0x40023009 1   // FCCOB6: Record byte 2 value --> FOPT (Bit15:Bit8)
mem8 0x40023008 1   // FCCOB7: Record byte 3 value --> FOPT (Bit7:Bit0)

Erase FOPT register (and flash content)

w1 0x40023007 0x44  // FCCOB0: CMD_ERASE_CHIP
w1 0x40023000 0x80  // Trigger operation