UPD16432B NEC, UPD16432B Datasheet - Page 15

• Manufacturer Part Number: UPD16432B
• Description: 1/8/ 1/15 DUTY LCD CONTROLLER/DRIVER
• Manufacturer: NEC

(2) Using KEY
Standby mode
Key data present
Standby transition time
Status command
Key scan
Data setting command
Key data
Key data
Key data
Key data
End
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.
Note If LCD normal operation or key scan operation is initiated within the standby transition time, the LCD
Item
may flicker.
n
STB
H
H
H
H
H
H
L
L
L
L
L
b7
1
0
*
*
*
*
b6
1
1
*
*
*
*
b5
0
0
*
*
*
*
Command/Data
Example of Use of KEY
b4
0
0
*
*
*
*
b3
1
0
*
*
*
*
b2
0
1
*
*
*
*
b1
0
0
*
*
*
*
b0
1
0
*
*
*
*
n
Standby release (KEY REQ = H,
OSC oscillation start)
10 s
LCD forced off (unselected waveform),
LED forced off, key scan operation
1 frame or more
Key data read, address increment
For KS
For KS
For KS
For KS
Key distinction
Note
8
6
4
2
, KS
, KS
, KS
, KS
7
5
3
1
Description
PD16432B
15