PM0222 datasheet(17/33 Pages) STMICROELECTRONICS

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PM0222

Flash controller

MASSERASE sequence:

–

Write the MASSERASE command (0x22) 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.

–

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 full main Flash will contain only bits set to ‘1’.

6.2.4

Write function examples

The Flash Controller allows writing / programming one word or the full main Flash memory

(with a single fixed word).

Note:

As a write can only program to ‘0’ on bits already set to ‘1’, it is necessary to erase the page

and request that the bits be set to ‘1’ (instead of ‘0’) in order to re-write to ‘0’.

WRITE sequence:

–

Indicate the location to write by filling the Flash Controller ADDRESS register with

the targeted address (page, row and word number)

–

Write the value to program in the Flash Controller DATA register.

–

Write the WRITE command (0x33) in the Flash Controller COMMAND register.

–

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.

–

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.

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