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AT89C5122D-RDRUM 数据表(PDF) 22 Page - ATMEL Corporation |
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AT89C5122D-RDRUM 数据表(HTML) 22 Page - ATMEL Corporation |
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22 / 208 page  22 AT83R5122, AT8xC5122/23 4202F–SCR–07/2008 Registers Reset Value = 0XXX X000b Table 5. Auxiliary Register - AUXR (8Eh) 7654 3210 DPU - - - XRS0 EXTRAM AO Bit Number Bit Mnemonic Description 7DPU Disable weak Pull-up 0 weak pull-up is enabled 1 weak pull-up is disabled 6-3 - Reserved The value read from this bit is indeterminate. Do not change these bits. 2XRS0 XRAM Size 0 256 bytes (default) 1 512 bytes 1EXTRAM 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. 0AO 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 when a MOVX or MOVC instruction is used. |
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