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T80C5112-RKSCL 数据表(PDF) 19 Page - ATMEL Corporation

部件名 T80C5112-RKSCL
功能描述  8-bit Microcontroller with A/D converter
PDF  97 Pages
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制造商  ATMEL [ATMEL Corporation]
网页  http://www.atmel.com
标志 ATMEL - ATMEL Corporation

T80C5112-RKSCL 数据表(HTML) 19 Page - ATMEL Corporation

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Rev. B - November 10, 2000
19
Preliminary
T80C5112
7.8. 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 6. AUXR Register
AUXR - Auxiliary Register (8Eh)
Reset Value = XXXX XXX0b
Not bit addressable
7
6
5
4
3
2
1
0
-
-
-
-
-
-
-
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
-
Reserved
The value read from this bit is indeterminate. Do not set this bit.
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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