RM0312 datasheet(37/275 Pages) STMICROELECTRONICS

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RM0312

Flash program memory and data EEPROM

4.8.2

Flash control register 2 (FLASH_CR2)

Address offset: 0x01

Reset value: 0x00

4.8.3

Flash program memory unprotecting key register (FLASH_PUKR)

Address offset: 0x02

Reset value: 0x00

654

3210

OPT

WPRG

ERASE

FPRG

Reserved

PRG

Bit 7 OPT: Write option bytes

This bit is set and cleared by software.

0: Write access to option bytes disabled

1: Write access to option bytes enabled

Bit 6 WPRG: Word programming

This bit is set by software and cleared by hardware when the operation is completed.

0: Word program operation disabled

1: Word program operation enabled

Bit 5 ERASE(1): Block erasing

This bit is set by software and cleared by hardware when the operation is completed.

0: Block erase operation disabled

1: Block erase operation enabled

Bit 4 FPRG(1): Fast block programming

This bit is set by software and cleared by hardware when the operation is completed.

0: Fast block program operation disabled

1: Fast block program operation enabled

Bits 3:1 Reserved

Bit 0 PRG: Standard block programming

This bit is set by software and cleared by hardware when the operation is completed.

0: Standard block programming operation disabled

1: Standard block programming operation enabled (automatically first erasing)

1. The ERASE and FPRG bits are locked when the memory is busy.

654

3210

MASS_PRG KEYS

Bits 7:0 PUK [7:0]: Main program memory unlock keys

This byte is written by software (all modes). It returns 0x00 when read.

Refer to Enabling write access to the main program memory on page 29 for the description

of main program area write unprotection mechanism.

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