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PD17202AGF-011 Arkusz danych(PDF) 10 Page - Renesas Technology Corp

Numer części PD17202AGF-011
Szczegółowy opis  4-BIT SINGLE-CHIP MICROCONTROLLER WITH LCD CONTROLLER/DRIVER AND KEY SCAN CIRCUIT FOR FPC (FRONT PANEL CONTROLLER)
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Producent  RENESAS [Renesas Technology Corp]
Strona internetowa  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

PD17202AGF-011 Arkusz danych(HTML) 10 Page - Renesas Technology Corp

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8
µPD17202AGF-011
3.
KEY SCAN
3.1 Key Scan Function
Key scanning is started when a key data output command is executed.
The INT pin (pin 35) goes high when key scanning has ended.
The INT pin goes low when the LOAD pin (pin 28) goes high.
Figure 3-1. Timing Chart of Key Scanning
KS0
KS1
KS2
KS3
KS4
INT
Key data output
command
Scanning ends
LOAD pin rises
Key data output
command
1.6 - 1.9 ms
(2.8 - 3.4 ms)
Note
50 - 60 s
µ
Note The value in brackets ( ) is when “display data input + key data output” is executed.


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