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AT89C51IC2-SLSCM Datasheet(PDF) 106 Page - ATMEL Corporation |
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AT89C51IC2-SLSCM Datasheet(HTML) 106 Page - ATMEL Corporation |
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106 / 146 page  106 AT89C51IC2 4301A–8051–01/04 Reduced EMI Mode The ALE signal is used to demultiplex address and data buses on port 0 when used with external program or data memory. Nevertheless, during internal code execution, ALE signal is still generated. In order to reduce EMI, ALE signal can be disabled by setting AO bit. The AO bit is located in AUXR register at bit location 0. As soon as AO is set, ALE is no longer output but remains active during MOVX and MOVC instructions and external fetches. During ALE disabling, ALE pin is weakly pulled high. Table 83. AUXR Register AUXR - Auxiliary Register (8Eh) 7654321 0 - - M0 - XRS1 XRS0 EXTRAM AO Bit Number Bit Mnemonic Description 7- Reserved The value read from this bit is indeterminate. Do not set this bit 6- Reserved The value read from this bit is indeterminate. Do not set this bit 5M0 Pulse length Cleared to stretch MOVX control: the RD/ and the WR/ pulse length is 6 clock periods (default). Set to stretch MOVX control: the RD/ and the WR/ pulse length is 30 clock periods. 4- Reserved The value read from this bit is indeterminate. Do not set this bit 3XRS1 XRAM Size XRS1XRS0XRAM size 0 0256 bytes (default) 0 1512 bytes 1 0768 bytes 1 11024 bytes 2XRS0 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. 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 during a MOVX or MOVC instructione is used. |
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