T89C51CC01 Atmel, T89C51CC01 Datasheet - Page 54

• Manufacturer Part Number: T89C51CC01
• Description: Enhanced 8-Bit Microcontroller
• Manufacturer: Atmel

Hardware Security Byte
54
T89C51CC01
Table 34. Hardware Security Byte
Default value after erasing chip: FFh
Notes:
Number
X2B
Bit
5-3
2-0
7
7
6
2. The 4 LSB bits can only be accessed by parallel mode.
1. Only the 4 MSB bits can be accessed by software.
Mnemonic Description
BLJB
LB2:0
BLJB
X2B
Bit
6
-
X2 Bit
Set this bit to start in standard mode.
Clear this bit to start in X2 mode.
Boot Loader JumpBit
- 1: To start the user’s application on next RESET (@0000h) located in FM0,
- 0: To start the boot loader(@F800h) located in FM1.
Reserved
The value read from these bits are indeterminate.
Lock Bits
5
-
4
-
3
-
LB2
2
LB1
1
4129K–CAN–01/05
LB0
0