STM8S datasheet(55/467 Pages) STMICROELECTRONICS

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RM0016

Flash program memory and data EEPROM

4.8.7

Data EEPROM unprotection key register (FLASH_DUKR)

Address offset: 0x0A

Reset value: 0x00

4.8.8

Flash status register (FLASH_IAPSR)

Address offset: 0x05

Reset value: 0x40

654

3210

MASS_DATA KEYS

Bits 7:0 DUK[7:0]: Data EEPROM write unlock keys

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

Refer to Enabling write access to the DATA area on page 45 for the description of main

program area write unprotection mechanism.

654

3210

Reserved

HVOFF

Reserved

DUL

EOP

PUL

WR_PG_DIS

res.

rc_w0

rc_r

rc_w0

rc_r

Bit 7 Reserved.

Bit 6 HVOFF: End of high voltage flag

This bit is set and cleared by hardware.

0: HV ON, start of actual programming

1: HV OFF, end of high voltage

Bits 5:4 Reserved, forced by hardware to 0.

Bit 3 DUL: Data EEPROM area unlocked flag

This bit is set by hardware and cleared by software by programming it to 0.

0: Data EEPROM area write protection enabled

1: Data EEPROM area write protection has been disabled by writing the correct MASS

keys

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