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AT80C51RA2-RLSIV 데이터시트(PDF) 50 Page - ATMEL Corporation

부품명 AT80C51RA2-RLSIV
상세설명  High Performance 8-bit Microcontroller
PDF  86 Pages
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제조업체  ATMEL [ATMEL Corporation]
홈페이지  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

AT80C51RA2-RLSIV 데이터시트(HTML) 50 Page - ATMEL Corporation

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50
4188F–8051–01/08
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
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 6-1.
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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