HT9B95B datasheet(17/32 Pages) HOLTEK

17 / 32 page

Rev. 1.10

November 25, 2015

HT9B95A/B/G

• Command Register Read Operation

The master reads the command register after setting

the slave address. Following the R/W bit (=”0”) is an

acknowledge bit and the register address byte which

is written to the internal address pointer. After the start

address of the read operation has been configured,

another START condition and the slave address

transferred on the bus followed by the R/W bit (=”1”).

Then the MSB of the data which was addressed

is transmitted first on the I2C bus. The C bit in the

All command setting values are put together into

two command registers with the register addresses

of 23H and 24H or 27H and 28H when the

Command Register Read Operation is executed.

Each time the Command Register Read Operation

is executed, only one command register can be

read. To read all command registers, execute the

Command Register Read Operation twice with the

respectively. The two command registers contents

are arranged in the following two registers and the

detailed definition are described in the “Command

Summary” section.

Part No.

Command

HT9B95A

23h

24h

HT9B95B

HT9B95G

27h

28h

Command Register Address

• Command Register 1

Bit

Name — DB SR LV4 LV3 LV2 LV1 LV0

Bit 6

DB: Duty and Bias setting

Bit 5

SR: Software Reset Operation

Bit 4~0

LV4~LV0: LCD Voltage Adjustment

setting

• Command Register 2

Bit

Name FR1 FR0 PS1 PS0 W

D AP1 AP0

Bit 7~6

FR1~FR0: Frame Frequency setting

Bit 5~4

PS1~PS0: Power Save Mode setting

Bit 3

W: LCD Drive Waveform setting

Bit 2

D: Display On/Off setting

Bit 1~0

AP1~AP0: All pixels On/Off setting

ACK

Slave Address

Command Data byte

1st data

ACK

Device Address

ACK

Command Register Address

NACK

C bit

Write

Read

Command Register Read Operation

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