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AT89C51CC03U-RDTIM データシート(PDF) 62 Page - ATMEL Corporation

部品番号 AT89C51CC03U-RDTIM
部品情報  Enhanced 8-bit MCU with CAN Controller and Flash Memory
PDF  197 Pages
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メーカー  ATMEL [ATMEL Corporation]
ホームページ  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

AT89C51CC03U-RDTIM データシート(HTML) 62 Page - ATMEL Corporation

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62
AT89C51CC03
4182K–CAN–05/06
Hardware Security Byte
Table 24. Hardware Security Byte
After erasing the chip in parallel mode, the default value is : FFh
The erasing in ISP mode (from bootloader) does not modify this byte.
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
54
32
1
0
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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