MSM82C51A-2 데이터 시트보기 (PDF) - Oki Electric Industry
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MSM82C51A-2 Datasheet PDF : 27 Pages
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¡ Semiconductor
MSM82C51A-2RS/GS/JS
FUNCTION
Outline
The MSM82C51A-2's functional configuration is programed by software.
Operation between the MSM82C51A-2 and a CPU is executed by program control. Table 1
shows the operation between a CPU and the device.
Table 1 Operation between MSM82C51A and CPU
CS C/D RD WR
1
¥
¥
¥
0
¥
1
1
0
1
0
1
0
1
1
0
0
0
0
1
0
0
1
0
Data Bus 3-State
Data Bus 3-State
Status Æ CPU
Control Word ¨ CPU
Data Æ CPU
Data ¨ CPU
It is necessary to execute a function-setting sequence after resetting the MSM82C51A-2. Fig. 1
shows the function-setting sequence.
If the function was set, the device is ready to receive a command, thus enabling the transfer of
data by setting a necessary command, reading a status and reading/writing data.
Internal Reset
External Reset
Write Mode Instruction
yes
Asynchronous
no
Write First Sync
Charactor
Single
yes
Sync Mode
no
Write Second Sync
Charactor
End of Mode Setting
Fig. 1 Function-setting Sequence (Mode Instruction Sequence)
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