UPD16431AGC-7ET 查看數據表（PDF） - NEC => Renesas Technology

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UPD16431AGC-7ET

1/2, 1/3, 1/4-DUTY LCD CONTROLLER/DRIVER

NEC => Renesas Technology 

µPD16431A

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

the command/data being transferred is made invalid (the command/data that has been already transferred

remains valid, however).

(1) Display setting command

This command initializes the µPD16431A and sets a duty cycle, frame frequency, drive voltage supply

method, test mode, and whether the µPD16431A 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.

MSB

LSB

0 b6 b5 b4 b3 b2 b1 b0

Sets duty.

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

Sets frame frequency.

00: (fOSC/128) × n

01: (fOSC/256) × n

10: (fOSC/512) × n

11: (fOSC/1024) × n

n= duty (1/2, 1/3, 1/4)

Sets drive voltage supply method.

0: Internal

1: External

Sets master or slave.

0: Master

1: Slave

Sets test mode.

0: Normal operation

1: Test mode

Values when power is applied

0000000

9

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