AT89C5132
Bit
Bit Number Mnemonic Description
Hardware Lock Bits
Refer to for bits description.
2 - 0
LB2:0
Reset Value = XXUU UXXX, UUUU UUUU after an hardware full chip erase.
1. X2B initializes the X2 bit in CKCON during the reset phase.
Note:
2. In order to ensure boot loader activation at first power-up, AT89C5132 products are delivered
with BLJB programmed.
3. Bits 0 to 3 (LSN) can only be programmed by hardware mode.
Table 8. SBV Byte – Software Boot Vector
7
6
5
4
3
2
1
0
ADD15
ADD14
ADD13
ADD12
ADD11
ADD10
ADD9
ADD8
Bit
Bit Number Mnemonic Description
MSB of the user’s bootloader 16-bit address location
Refer to the bootloader datasheet for usage information (bootloader dependent).
7 - 0
ADD15:8
Reset Value = XXXX XXXX, UUUU UUUU after an hardware full chip erase.
Table 9. SSB Byte – Software Security Byte
7
6
5
4
3
2
1
0
SSB7
SSB6
SSB5
SSB4
SSB3
SSB2
SSB1
SSB0
Bit
Bit Number Mnemonic Description
Software Security Byte Data
Refer to the bootloader datasheet for usage information (bootloader dependent).
7 - 0
SSB7:0
Reset Value = XXXX XXXX, UUUU UUUU after an hardware full chip erase.
21
4173E–USB–09/07
ATMEL [ ATMEL ]
