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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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AT80SND1C-ROTIL 데이터시트(PDF) 22 Page - ATMEL Corporation |
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AT80SND1C-ROTIL 데이터시트(HTML) 22 Page - ATMEL Corporation |
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22 / 210 page  22 AT8xC51SND1C 4109E–8051–06/03 Hardware Bytes Table 22. HSB Byte – Hardware Security Byte Reset Value = XXUU UXXX, UUUU UUUU after an hardware full chip erase. Note: 1. X2B initializes the X2 bit in CKCON during the reset phase. 2. In order to ensure boot loader activation at first power-up, AT89C51SND1C products are delivered with BLJB programmed. 3. Bits 0 to 3 (LSN) can only be programmed by hardware mode. Reset Value = XXXX XXXX, UUUU UUUU after an hardware full chip erase. Reset Value = XXXX XXXX, UUUU UUUU after an hardware full chip erase. 7654 3210 X2B BLJB - - - LB2 LB1 LB0 Bit Number Bit Mnemonic Description 7X2B(1) X2 Bit Program this bit to start in X2 mode. Unprogram (erase) this bit to start in standard mode. 6BLJB (2) Boot Loader Jump Bit Program this bit to execute the boot loader at address F000h on next reset. Unprogram (erase) this bit to execute user’s application at address 0000h on next reset. 5 - 4 - Reserved The value read from these bits is always unprogrammed. Do not program these bits. 3- Reserved The value read from this bit is always unprogrammed. Do not program this bit. 2 - 0 LB2:0 Hardware Lock Bits Refer to for bits description. Table 23. SBV Byte – Software Boot Vector 7654 3210 ADD15 ADD14 ADD13 ADD12 ADD11 ADD10 ADD9 ADD8 Bit Number Bit Mnemonic Description 7 - 0 ADD15:8 MSB of the user’s boot loader 16-bit address location Refer to the boot loader datasheet for usage information (boot loader dependent) Table 24. SSB Byte – Software Security Byte 7654 3210 SSB7 SSB6SSB5SSB4SSB3SSB2SSB1 SSB0 Bit Number Bit Mnemonic Description 7 - 0 SSB7:0 Software Security Byte Data Refer to the boot loader datasheet for usage information (boot loader dependent) |
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