PM0222 datasheet(16/33 Pages) STMICROELECTRONICS

16 / 33 page

Flash controller

PM0222

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contains a signature of the memory read, built according to the following polynomial:

x32 + x31 + x4 + x3 + x1 + 1 (seed value = 0xFFFF_FFFF).

MASSREAD sequence:

–

Write in the Flash Controller DATA register the expected value (if MASSREAD is

used in combination with the READOK flag).

–

Write the MASSREAD command (0x55) in the Flash Controller COMMAND

–

Wait for the CMDSTART flag in the IRQSTAT register (polling mode or interrupt

mode) indicating that the command has been taken into account and is under

execution.

–

Clear the CMDSTART flag by writing CMDSTART to ‘1’ in the Flash Controller

IRQSTAT register.

–

Then, wait for the CMDDONE flag in the IRQSTAT register (polling mode or

interrupt mode) indicating that the command is completed.

–

Check the READOK flag (expected high) in the IRQSTAT register or the LFSRVAL

–

Clear the CMDDONE flag by writing CMDDONE to ‘1’ in the Flash Controller

IRQSTAT register.

6.2.3

Erase function examples

The Flash controller allows erasing one page or the full main Flash.

ERASE sequence:

–

Write the page address to be erased by writing in the Flash Controller ADDRESS

ADDRESS[13:9] = XADR[7:3] = page address to erase

ADDRESS[8:0] = 9’b0 (row and word addresses at zero).

–

Write the ERASE command (0x11) in the Flash Controller COMMAND register.

–

Wait for the CMDSTART flag in the IRQSTAT register (polling mode or interrupt

mode) indicating command is taken into account and under execution.

–

Clear the CMDSTART flag by writing CMDSTART to ‘1’ in the Flash Controller

IRQSTAT register.

–

Wait for the CMDDONE flag in the IRQSTAT register (polling mode or interrupt

mode) indicating that the command is completed.

–

Clear the CMDDONE flag by writing CMDDONE to ‘1’ in the Flash Controller

IRQSTAT register.

–

After this command, the erased page will contain only bits set to ‘1’.

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