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AT89C51AC3-RDTIM 数据表(PDF) 59 Page - ATMEL Corporation |
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AT89C51AC3-RDTIM 数据表(HTML) 59 Page - ATMEL Corporation |
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59 / 143 page ![]() 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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