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Datenblatt-Suchmaschine für elektronische Bauteile |
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Datenblatt-Suchmaschine für elektronische Bauteile |
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AT80C51RA2-RLSIV Datenblatt(PDF) 50 Page - International Rectifier |
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AT80C51RA2-RLSIV Datenblatt(HTML) 50 Page - International Rectifier |
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50 / 85 page  50 4188E–8051–08/06 AT/TS8xC51Rx2 7.1 Reduced EMI Mode The ALE signal is used to demultiplex address and data buses on port 0 when used with exter- nal 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 7-2. AUXR Register AUXR - Auxiliary Register (8Eh) Reset Value = XXXX XX00b Not bit addressable 76 543 210 --- --- 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. 5- Reserved The value read from this bit is indeterminate. Do not set this bit. 4- Reserved The value read from this bit is indeterminate. Do not set this bit. 3- Reserved The value read from this bit is indeterminate. Do not set this bit. 2- Reserved The value read from this bit is indeterminate. Do not set this bit. 1 EXTRAM EXTRAM bit See Table 6-1. 0AO ALE Output bit Clear to restore ALE operation during internal fetches. Set to disable ALE operation during internal fetches. |
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