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TS80C51RA2-VCKB Datasheet(PDF) 50 Page - ATMEL Corporation |
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TS80C51RA2-VCKB Datasheet(HTML) 50 Page - ATMEL Corporation |
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50 / 74 page  50 Rev. C - 06 March, 2001 TS80C51RA2/RD2 TS83C51RB2/RC2/RD2 TS87C51RB2/RC2/RD2 6.13. 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 27. AUXR Register AUXR - Auxiliary Register (8Eh) Reset Value = XXXX XX00b Not bit addressable 7 6 5 4 3 2 1 0 - - - - - - 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 5. 0 AO ALE Output bit Clear to restore ALE operation during internal fetches. Set to disable ALE operation during internal fetches. |
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