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T89C51AC2-RLSI-M 数据表(PDF) 50 Page - ATMEL Corporation |
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T89C51AC2-RLSI-M 数据表(HTML) 50 Page - ATMEL Corporation |
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50 / 117 page  50 Draft.A - March 30, 2001 Preview - Confidential T89C51AC2 10.7. Hardware Byte Default value after erasing chip: FFh NOTE: Only the 4 MSB bits can be access by software. The 4 LSB bits can only be access by parallel mode. Figure 32. Hardware byte 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 Clear (=1)this bit to start the user’s application on next RESET (@0000h) located in FM0, Set (=0)this bit 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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