UPD16432BGC-001-9EU Просмотр технического описания (PDF) - NEC => Renesas Technology

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UPD16432BGC-001-9EU

1/8, 1/15 DUTY LCD CONTROLLER/DRIVER

NEC => Renesas Technology 

µPD16432B

(2) Using KEYn

If any key is set to the ON state, the standby mode is released and OSC oscillation starts. Also, KEY REQ is set

to “H”, informing the microcomputer that a key has been pressed and standby mode has been released. In this

state, the key data is not memorized, and therefore it is necessary to set key scanning to the normal state after

the standby transition time, and fetch the key data.

Example of Use of KEYn

Item

Standby mode

Key data present

Standby transition time

Status command

Key scan

Data setting command

Key data

Key data

Key data

Key data

End

Command/Data

STB

b7 b6 b5 b4 b3 b2 b1 b0

Description

L

L

Standby release (KEY REQ = H,

OSC oscillation start)

L

10 µsNote

H 1 1 0 0 1 0 0 1 LCD forced off (unselected waveform),

LED forced off, key scan operation

L

1 frame or more

H 0 1 0 0 0 1 0 0 Key data read, address increment

H

* * * * * * * * For KS8, KS7

H

* * * * * * * * For KS6, KS5

H

* * * * * * * * For KS4, KS3

H

* * * * * * * * For KS2, KS1

L

Key distinction

Note If LCD normal operation or key scan operation is initiated within the standby transition time, the LCD

may flicker.

15

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