topic internal flash execution in Kinetis Microcontrollers

internal flash execution

alex_br — Thu, 24 Mar 2011 04:12:13 GMT

Hi,

We are considering to use Kinetis part with flex memory of 128K. I would like to partition our flexNVM:

sector 1) 48 K program code

sector 2) 48 K program code

sector 3) 32 K Eprom data storage.

If my program is executing from internal flash flexNVM in sector 1, can this program write into sector 2 or sector 3.

Thank you for your help,

Alex B.

dani85 — Fri, 25 Mar 2011 16:06:54 GMT

Hi,

Because sector 1 and 2 are on the same flexNVM block, read data cannot be guaranteed from a Flash block that is being writen.

alex_br — Wed, 30 Mar 2011 23:42:57 GMT

Thanks for respose,

Can you please explain in more details why read data is not garantee during writing to the same block? Is it just protection issue?

alex_br — Fri, 01 Apr 2011 21:56:54 GMT

I found the explanation in the K60 manual:

Flash Reads and Ignored Writes

The FTFL module requires only the flash address to execute a flash memory read. MCU

read access is available to all flash blocks.

The MCU must not read from the flash memory while commands are running (as

evidenced by CCIF=0) on that block. Read data cannot be guaranteed from a flash block

while any command is processing within that block. The block arbitration logic detects

any simultaneous access and reports this as a read collision error (see the

FSTAT[RDCOLERR] bit).