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AT83SND1CXXX-ROTIL Scheda tecnica(PDF) 23 Page - ATMEL Corporation |
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AT83SND1CXXX-ROTIL Scheda tecnica(HTML) 23 Page - ATMEL Corporation |
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23 / 212 page ![]() 7 4109J–8051–10/06 AT8xC51SND1C Reset Value = XXXX 00X0b Note: 1. ENBOOT bit is only available in AT89C51SND1C product. 6.8 Hardware Bytes Table 23. 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 deliv- ered with BLJB programmed. 3. Bits 0 to 3 (LSN) can only be programmed by hardware mode. 3GF3 General Flag This bit is a general-purpose user flag. 20 Always Zero This bit is stuck to logic 0 to allow INC AUXR1 instruction without affecting GF3 flag. 1- Reserved for Data Pointer Extension. 0DPS Data Pointer Select Bit Set to select second data pointer: DPTR1. Clear to select first data pointer: DPTR0. Bit Number Bit Mnemonic Description 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 24. SBV Byte – Software Boot Vector 7654 3210 ADD15 ADD14 ADD13 ADD12 ADD11 ADD10 ADD9 ADD8 |
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