What memory block to use (PFB01CR or PFB23CR)?

[markosiponen]

I'm using a MK10FN1M0VLQ12.

I must modify an old function from a previous project that writes to MCU flash (not the same MCU).

I have a lot of access to register PFB0CR in my old code.

But this register is doubled in MK10FN1M0VLQ12, called PFB01CR and PFB23CR.

I don't understand which one I should use. I must write to a region at address 0xFF000 to 0xFFFFF. What memory bank is this?

The reference manual says:

• For devices with program flash only: 4 blocks of program flash consisting of 4 KB

sectors

and

• FMC_PFB01CR controls the lower code addresses (blocks 0-1)

• FMC_PFB23CR controls the upper code addresses (blocks 2-3)

So is the flash memory (1MByte) divided in four parts so

block 0 = 0x00000000 - 0x001FFFFF

block 1 = 0x00200000 - 0x003FFFFF

block 2 = 0x00400000 - 0x005FFFFF

block 3 = 0x00600000 - 0x007FFFFF

And if this is correct I should use PFB23CR?

And one more question. Do I still need to invalidate the cache ways?

FMC->PFB01CR = PFB0CR_restore | FMC_PFB01CR_CINV_WAY(15);

[Jorge_Gonzalez]

Hello markosiponen:

We are sorry for the time with no response.

Your understanding is basically correct, but the addresses are wrong. They should be like this:

Block 0: 0x00000000 - 0x0003FFFF

Block 1: 0x00040000 - 0x0007FFFF

Block 2: 0x00080000 - 0x000BFFFF

Block 3: 0x000C0000 - 0x000FFFFF

So for the addresses 0xFF000 to 0xFFFFF you are correct to use PFB23CR.

And yes, it is recommended to invalidate the cache when reading/writing to flash.

Hope this helps clarifying.

Regards!,
Jorge Gonzalez

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