HD66727 Datasheet, PDF (47/97 Pages) Hitachi Semiconductor – Low-Power Dot-Matrix Liquid Crystal Display Controller/Driver with Key Scan Function

HD66727
Table 24 First Bytes of I²C Bus Interface Data
Transferred Bit String
First Byte of
S
Bit 1 Bit 2 Bit 3 Bit 4 Bit 5 Bit 6 Bit 7 Bit 8
I²C bus system *¹ Transfer A6
A5
A4
A3
A2
A1
A0
R/W
start
HD66727 *²
Transfer 0
1
1
1
ID1 ID0 RS R/W
start
Notes: 1. Bits 1 to 7 of the first byte of the I²C bus system indicate the I²C slave address.
2. Bits 1 to 6 of the first byte of the HD66727 indicate the device ID code.
Bit 9
ACK
ACK
Table 25 RS and R/W Bit Function of I²C Bus Interface Data
RS R/W Function
0
0
Writes instruction
0
1
Reads key scan data and BF flag
1
0
Writes RAM data
1
1
Reads RAM data
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