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AT89C51AC3-RDTIM Datasheet(PDF) 59 Page - ATMEL Corporation

Part # AT89C51AC3-RDTIM
Description  Enhanced 8-bit Microcontroller with 64KB Flash Memory
PDF  140 Pages
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Manufacturer  ATMEL [ATMEL Corporation]
Direct Link  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

AT89C51AC3-RDTIM Datasheet(HTML) 59 Page - ATMEL Corporation

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59
AT89C51AC3
4383D–8051–02/08
Hardware Security Byte
Table 24. Hardware Security Byte
Default value after erasing chip: FFh
Notes:
1. Only the 4 MSB bits can be accessed by software.
2. The 4 LSB bits can only be accessed by parallel mode.
7
6
5
4
3
2
1
0
X2B
BLJB
-
-
-
LB2
LB1
LB0
Bit
Number
Bit
Mnemonic Description
7
X2B
X2 Bit
Set this bit to start in standard mode
Clear this bit to start in X2 mode.
6
BLJB
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.
5-3
-
Reserved
The value read from these bits are indeterminate.
2-0
LB2:0
Lock Bits



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