UPD16431A NEC, UPD16431A Datasheet - Page 9

• Manufacturer Part Number: UPD16431A
• Description: 1/2/ 1/3/ 1/4-DUTY LCD CONTROLLER/DRIVER
• Manufacturer: NEC

COMMAND
the command/data being transferred is made invalid (the command/data that has been already transferred
remains valid, however).
(1) Display setting command
A command sets a display mode and a status.
The first 1 byte input after the STB pin has fallen is regarded as a command.
If the STB pin is made low while a command/data is transferred, serial communication is initialized, and
This command initializes the PD16431A and sets a duty cycle, frame frequency, drive voltage supply
method, test mode, and whether the PD16431A operates as the master or a slave.
When this command is executed, display is forcibly turned off and key scanning is stopped. To resume
the display, the normal operation of the “status command” must be executed. Note, however, that nothing
is executed if the same mode is selected.
Values when power is applied
MSB
0
b6
0
b5
0
b4
0
b3
0
b2
0
b1
0
LSB
b0
0
Sets duty.
Sets frame frequency.
Sets drive voltage supply method.
Sets master or slave.
Sets test mode.
00: 1/4 duty, 1/3 bias
01: 1/3 duty, 1/3 bias
10: 1/2 duty, 1/2 bias
11: 1/2 duty, 1/2 bias
00: (f
01: (f
10: (f
11: (f
0: Internal
1: External
0: Master
1: Slave
0: Normal operation
1: Test mode
n= duty (1/2, 1/3, 1/4)
OSC
OSC
OSC
OSC
/128)
/256)
/512)
/1024)
n
n
n
n
PD16431A
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