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AT89C51AC3-RDTUM 데이터시트(PDF) 59 Page - ATMEL Corporation

부품명 AT89C51AC3-RDTUM
상세설명  Enhanced 8-bit Microcontroller with 64KB Flash Memory
PDF  143 Pages
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제조업체  ATMEL [ATMEL Corporation]
홈페이지  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

AT89C51AC3-RDTUM 데이터시트(HTML) 59 Page - ATMEL Corporation

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59
AT89C51AC3
4383B–8051–01/05
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.
76
543
210
X2B
BLJB
-
-
-
LB2
LB1
LB0
Bit
Number
Bit
Mnemonic Description
7X2B
X2 Bit
Set this bit to start in standard mode
Clear this bit to start in X2 mode.
6BLJB
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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