Datasheet > BU9795AFV-LBE2

BU9795AFV-LBE2

更新时间： 2024-02-03 00:42:55

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罗姆 - ROHM		/
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描述
Standard LCD Segment Drivers

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数据手册

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BU9795AFV-LBE2 数据手册

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BU9795AFV-LB

MAX 108 segments (SEG27×COM4)

Function Description

Command and data transfer method

3-SPI (3wire Serial interface)

This device is controlled by 3-wire signal (CSB, SCL, and SD).

First, Interface counter is initialized with CSB=“H", and CSB=“L” makes SD and SCL input enable.

The protocol of 3-SPI transfer is as follows.

Each command starts with Command or Data judgment bit (D/C) as MSB data, followed by D6 to D0 during

CSB =“L”.

(Internal data is latched at the rising edge of SCL, it is converted to 8bits parallel data at the falling edge of 8th CLK.)

Command/Data

Command

CSB

SCL

D/C D6 D5 D4 D3 D2 D1 D0

D/C D6 D5 D4 D3 D2 D1 D0 D7 D6 D5 D4 D3 D2 D1 D0 D7 D6

D/C = “H” : Command

D/C = “L” : Data

Figure 7. 3-SPI Command/Data transfer format

Command transfer method

After CSB=“H”→”L”, 1st byte is always a command input.

MSB of the command input data will be judged that the next byte data, it is a command or display data (This bit is

called

“command or data judgment bit”).

When set “command or data judge bit”=‘1’, next byte will be (continuously) command.

When set “command or data judge bit”=‘0’, next byte data is display data.

Display Data

Command

…

Command

Once it becomes display data transfer condition, it will not be back to command input condition even if D/C=1.

So if you want to send command data again, please set CSB=“L”→”H”.

(CSB “L”→”H” will cancel data transfer condition.)

Command transfer is done by 8bits unit, so if CSB=“L”→”H” with less than 8bits data transfer, command will be

cancelled.

It will be able to transfer command with CSB=“L” again.

In Case Of Command Transfer

Command

CSB

SCL

Command Cancelled (Less Than 8bits)

STATUS

DISCTL Command Transfer

DISPON Command Transfer

Figure 8. Command transfer format

www.rohm.com

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26.Feb.2014 Rev.002

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