S1D15715 Epson Electronics America, Inc., S1D15715 Datasheet - Page 40

• Manufacturer Part Number: S1D15715
• Description: Liquid Crystal Display =lcd Driver
• Manufacturer: Epson Electronics America, Inc.

S1D15715 Series Technical Manual
7.10 Display data write
This command writes 8-bit data to the specified DDRAM address.
Since the column address is automatically incremented after each write, the MPU can continuously write
multiple-word data.
See the function explanation in “DDRAM and page/column address circuit”, for details.
7.11 Read modify write
This command is used paired with end command.
Once this command is issued, the column address is not incremented by display data read command but is
incremented by display data write command. This mode is maintained until end command is issued.
When end command is issued, the column address returns to the address it was at when read modify write
command was issued.
This function makes it possible to reduce the MPU load when there are data to change repeatedly in a specified
display region, such as blinking cursor.
• The sequence for cursor display
34
*
*
A0
A0
1
0
When end command is issued, only column address returns to the address.
Consequently, Read modify write mode cannot be used over pages.
Since the page address is automatically incremented for this IC, when end command is executed after
the data is written to the last column address (65H), it does not return to the original location in the
display.
When you want to maintain the current page address after a read modify write operation done on a
column address between the start and the final column address (65H), you must specify the page address
again.
Even if in Read modify write mode, other commands besides display data read/write can also be used.
However, column address set command cannot be used.
___
___
RD
RD
E
E
1
1
R/
R/
___
WR
___
WR
0
0
__
__
W
W
D7
D7
1
D6
D6
1
No
D5
D5
1
Column address set
Read modify write
Page address set
Write Data
Dummy read
D4
D4
Completed?
0
Data write
Data read
Fig.15
EPSON
End
D3
D3
0
Yes
D2
D2
0
D1
D1
0
Data processing
D0
D0
0
Rev.1.0