HD66727 Datasheet, PDF (50/97 Pages) Hitachi Semiconductor – Low-Power Dot-Matrix Liquid Crystal Display Controller/Driver with Key Scan Function

HD66727
a) Basic Data-Transfer Timing through Clock-Synchronized Serial Bus Interface
Transfer start
CS*
(Input)
Transfer end
SCL
(Input)
SDA
(Input/
Output)
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
MSB
LSB
"0" "1" "1" "1" "0" ID0 RS R/W DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0
Device ID code
RS R/W
Start byte
Instruction, RAM data,
key-scanned data
b) Consecutive Data-Transfer Timing through Clock-Synchronized Serial Bus Interface
CS*
(Input)
SCL
(Input)
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32
SDA
(Input/
output)
Start
Start byte
Instruction 1
Instruction 2
Instruction 3
Instruction 1
Instruction 2
End
execution time
execution time
Adjust the transfer rate so that the HD66727 can complete
instruction 1 before the 8th bit of instruction 2 is transferred.
Figure 24 Clock-Synchronized Serial Interface Timing Sequence
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