UPD17202AGF-011 Просмотр технического описания (PDF) - NEC => Renesas Technology

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UPD17202AGF-011

4-BIT SINGLE-CHIP MICROCONTROLLER WITH LCD CONTROLLER/DRIVER AND KEY SCAN CIRCUIT FOR FPC (FRONT PANEL CONTROLLER)

NEC => Renesas Technology 

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

50 - 60 µs

KS0

KS1

KS2

KS3

KS4

1.6 - 1.9 ms

(2.8 - 3.4 ms)Note

INT

Key data output

command

Scanning ends

LOAD pin rises

Key data output

command

Note The value in brackets ( ) is when “display data input + key data output” is executed.

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