M80C85 データシートの表示（PDF） - Oki Electric Industry
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M80C85 Datasheet PDF : 19 Pages
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¡ Semiconductor
MSM82C53-2RS/GS/JS
DESCRIPTION OF BASIC OPERATIONS
Data transfers between the internal registers and the external data bus is outlined in the
following table.
CS RD WR A1 A0
0
1
0
0
0
0
1
0
0
1
0
1
0
1
0
0
1
0
1
1
0
0
1
0
0
0
0
1
0
1
0
0
1
1
0
Function
Data Bus to Counter #0 Writing
Data Bus to Counter #1 Writing
Data Bus to Counter #2 Writing
Data Bus to Control Word Register Writing
Data Bus from Counter #0 Reading
Data Bus from Counter #1 Reading
Data Bus from Counter #2 Reading
0
0
1
1
1
1
¥
¥
¥
¥
0
1
1¥
¥
Data Bus High Impedance Status
¥ denotes "not specified".
DESCRIPTION OF OPERATION
MSM82C53-2 functions are selected by a control word from the CPU. In the required program
sequence, the control word setting is followed by the count value setting and execution of the
desired timer operation.
Control Word and Count Value Program
Each counter operation mode is set by control word programming. The control word format
is out-lined below.
D7
D6
SC1 SC0
Select Counter
D5
D4
RL1 RL0
Read/Load
D3
D2
D1
D0
M2
M1
M0
BCD
Mode
BCD
(CS=0, A0, A1=1, 1, RD=1, WR=0)
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