HD66727 Datasheet, PDF(54/97 Page) Hitachi Semiconductor – Low-Power Dot-Matrix Liquid Crystal Display Controller/Driver with Key Scan Function

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HD66727 Datasheet, PDF (54/97 Pages) Hitachi Semiconductor – Low-Power Dot-Matrix Liquid Crystal Display Controller/Driver with Key Scan Function

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HD66727

a) Scan Data Read Timing through Clock-Synchronized Serial Bus Interface

Transfer start

CS*

(Input)

Transfer end

SCL

(Input)

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16

SDA

(Input/

output)

0 1 1 1 0 ID0 RS R/W BF SF1 SF0 TF SD3 SD2 SD1SD0

Device ID code

RS R/W Busy

Scan

flag

Scan

data

Start byte

SCAN0 data transmission

b) Scan Data Read Timing through I2C Bus Interface

Transfer start

Transfer end

SCL

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18

(Input)

SDA

(Input/

output)

0 1 1 1 ID1 ID0 RS R/W Ack BF SF1 SF0 TF SD3 SD2 SD1 SD0 Ack

Device ID code

1st byte

RS R/W

Busy

Scan

flag

Scan

data

Acknowledge SCAN0 data transmission

Acknowledge

c) Consecutive Scan Data Read Timing

SCL

(Input)

SDA

(Input/

output)

Start

byte

Wait

SCAN0

data

SCAN1

data

SCAN2

data

SCAN3

data

Wait

SCAN7

data

SCAN0

data

Figure 28 Scan Data Serial Transfer Timing

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