S1D1 Epson Electronics America, Inc., S1D1 Datasheet - Page 74

• Manufacturer Part Number: S1D1
• Description: LCD Controller-driver With Built-in Character ROM
• Manufacturer: Epson Electronics America, Inc.

S1D15210 Series
(10) Read-Modify-Write
This command defeats column address register auto-increment after data reads. The current conetents of the column
address register are saved. This mode remains active until an End command is received.
• Operation sequence during cursor display
When the End command is entered, the column address is returned to the one used during input of Read-Modify-Write
command. This function can reduce the load of MPU when data change is repeated at a specific display area (such as cursor
blinking).
* Any command other than Data Read or Write can be used in the Read-Modify-Write mode. However, the Column
Address Set command cannot be used.
(11) End
This command cancels read-modify-write mode and restores the contents of the column address register to their value prior
to the receipt of the Read-Modify-Write command.
3–16
A
A
Column address
0
0
0
0
RD
RD
(E)
(E)
1
1
(R/W)
(R/W)
WR
WR
0
0
D
D
1
1
7
7
D
D
1
1
N
6
6
Read-Modify-Write mode is selected.
D
D
N+1
1
1
5
5
EPSON
No
Set Column Address
Read-Modify-Write
Set Page Address
D
D
0
0
N+2
4
Dummy Read
4
Completed?
Read Data
Write Data
End
D
D
0
1
3
3
N+3
Yes
D
D
0
1
2
2
D
D
0
1
1
1
N+m
D
D
0
0
0
0
E0H
EEH
N
End
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Rev. 1.1