PM0020 datasheet(23/87 Pages) STMICROELECTRONICS

23 / 87 page

PM00020

STR91xFA Flash memory

23/87

Write a Program Set-up command (40h) to any word address in the bank to be

programmed.

Write the data halfword to be programmed to the destination address in the bank.The

address must be pointing to the halfword location where the data is programmed.

After writing the data, reading any address within the bank will return the Bank Status

–

While programming is in progress the PECS bit in the Bank Status Register is ‘0’.

When programming is completed the PECS bit is ‘1’.

–

The PS bit in the Bank Status Register returns ‘1’ if there has been a programming

error.

–

If the bank is protected, the program operation aborts and the SP bit in the Status

While programming is ongoing, the bank accepts only Read Status Register (70h) and

Program/Erase Suspend (B0h) commands.

At the end of the program operation:

–

Write a Clear Status Register (50h) command to the bank to reset the Status

–

Write a Read Array (FFh) command to return to normal operations.

Note:

Programming aborts if the MCU is powered down or a reset occurs. As data integrity cannot

be guaranteed when the program operation is aborted, the sector containing the memory

location must be erased and reprogrammed.

1.12.3

CLSR clear status register (50h)

Each bank has a Status Register which indicates when a program or erase operation is

complete and the success or error status. (see also Section 1.13.1: Bank status register).

To clear the Status Register:

Write a Clear Status Register command (50h) to any word address in the bank.

After the Clear Status Register command is executed, the bank returns automatically to

Read Array mode.

1.12.4

CR write Flash configuration register (60h)+(03h)

The Flash Configuration Register is located in the user configuration sector of Bank 1 which

you can read using the RSIG command.

To program the Flash Configuration Register:

Write a Write Flash Configuration Register command (60h) to any word address in

Bank 1.

Write a Write Flash Configuration Register Confirm command (03h) to an address in

Bank 1. The A[12:9] and A4 address bit values are written to the Flash Configuration

At the end of the command, the memory returns to Read mode as if a Read Array

command had been issued

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