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AT89C51ED2-RDTUM 数据表(PDF) 25 Page - ATMEL Corporation |
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AT89C51ED2-RDTUM 数据表(HTML) 25 Page - ATMEL Corporation |
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25 / 137 page ![]() 25 4235K–8051–05/08 AT89C51RD2/ED2 Reset Value = 0X00 1000 Not bit addressable 1 EXTRAM EXTRAM bit Cleared to access internal XRAM using movx @ Ri/ @ DPTR. Set to access external memory. Programmed by hardware after Power-up regarding Hardware Security Byte (HSB), default setting, XRAM selected. 0 AO ALE Output bit Cleared, ALE is emitted at a constant rate of 1/6 the oscillator frequency (or 1/3 if X2 mode is used). (default) Set, ALE is active only during a MOVX or MOVC instruction is used. Bit Number Bit Mnemonic Description |
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