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4551 Datasheet(PDF) 85 Page - Renesas Technology Corp

Part # 4551
Description  4-BIT SINGLE-CHIP MICROCOMPUTER
PDF  155 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

4551 Datasheet(HTML) 85 Page - Renesas Technology Corp

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4551 Group User’s Manual
APPLICATION
2-7
2.1 I/O pins
Fig. 2.1.2 Input timing of key scan
High
Low
D0
High
Low
High
Low
High
Low
D1
D2
D3
IAP0
IAP0
IAP0
IAP0
Input of
SW13–SW16
IAP0
Switch of key input selection port (D0
→D1)
Waiting time for stabilizing until input
Reading of port (key input)
Key input cycle
Input of
SW1–SW4
Input of
SW9–SW12
Input of
SW5–SW8
Input of
SW1–SW4
Note: Output from port D is high-impedance state.



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