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AT89C5132-ROTIL Datasheet(PDF) 8 Page - ATMEL Corporation |
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AT89C5132-ROTIL Datasheet(HTML) 8 Page - ATMEL Corporation |
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8 / 33 page  8 4256B–USB–03/06 AT89C5132 Registers Special Function Register Table 4. AUXR1 Register AUXR1 (S:A2h) – Auxiliary Register 1 Reset Value = XXXX 00X0b Note: 1. ENBOOT bit is only available in AT89C5132 product. Hardware Bytes Table 5. HSB Byte – Hardware Security Byte Reset Value = XXUU UXXX, UUUU UUUU after an hardware full chip erase. 7 6 5 4 3 2 1 0 - - ENBOOT - GF3 0 - DPS Bit Number Bit Mnemonic Description 7 - 6 - Reserved The value read from these bits are indeterminate. Do not set these bits. 5 ENBOOT(1) Enable Boot Flash Set this bit to map the boot Flash in the code space between at addresses F000h to FFFFh. Clear this bit to disable boot Flash. 4 - Reserved The value read from this bit is indeterminate. Do not set this bit. 3 GF3 General Flag This bit is a general-purpose user flag. 2 0 Always Zero This bit is stuck to logic 0 to allow INC AUXR1 instruction without affecting GF3 flag. 1 - Reserved for Data Pointer Extension. 0 DPS Data Pointer Select Bit Set to select second data pointer: DPTR1. Clear to select first data pointer: DPTR0. 7 6 5 4 3 2 1 0 X2B BLJB - - - LB2 LB1 LB0 Bit Number Bit Mnemonic Description 7 X2B(1) X2 Bit Program this bit to start in X2 mode. Unprogram (erase) this bit to start in standard mode. 6 BLJB (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 -(3) Reserved The value read from this bit is always unprogrammed. Do not program this bit. 2-0 LB2:0(3) Hardware Lock Bits Refer to for bits description. |
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