C8051F70X_0910 Datasheet, PDF (144/290 Pages) Silicon Laboratories – Mixed Signal ISP Flash MCU Family

C8051F70x/71x
SFR Definition 21.4. EEKEY: EEPROM Protect Key
Bit
7
6
5
4
3
2
1
0
Name
EEKEY
EEPSTATE/EEKEY
Type
W
R/W
Reset
0
0
0
0
0
0
0
0
SFR Address = 0xC6; SFR Page = F
Bit
Name
Description
7:0
EEKEY
EEPROM Key
Protects the EEPROM from
inadvertent writes and
erases.
1:0 EEPSTATE _{EEPROM Protection State}
These bytes show whether
Flash writes/erases have
been enabled, disabled, or
locked.
Write
The sequence 0x55
0xAA must be written to
enable EEPROM writes
and erases
Read
00: Write/Erase is not
enabled
01: The first key has
been written
10: Write/Erase is
enabled
11: EEPROM is locked
from further
writes/erases
144
Rev. 0.3