Specifications

8–36 EPSON
SED1240 Series
RAM data write
Function: Writes data in the RAM areas of the DDRAM,
CGRAM, symbol register RAM, static icon
RAM, and electronic volume RAM.
Before this command, be sure to execute the
address set command.
After that, each time data is written, the
address will be automatically incremented.
(Regarding the RE bit, the contents set by the
command will be kept in memory.)
1 Data is written into the DDRAM, CGRAM, symbol
register RAM, static icon RAM, or electronic volume
RAM.
2 The address counter is automatically incremented by
1, so data can be written in succession. However, the
address counter advances from 00H to 7FH to 00H.
Accordingly, when writing data into the CGRAM,
take care not to write it at the addresses subsequent to
30H.
<Data write example>
An example of writing one line of data into the DDRAM continuously is shown below.
Write data
NO
YES
End of 1 line?
Set RAM address
Note: Before executing instructions in succession,
secure a time exceeding t
CYC and then
execute them.
NOP
Function: A no-operation command. No operation is
performed functionally. However, because
a test mode reset function exists inside, the
test mode can be reset if the IC is put into this
mode by an effect of noise.
It is recommended to add this command at
each breakpoint of the program.
Test mode
Function: An IC test mode set command. Don’t use it
in any case.
RE A0 WR D7 D6 D5 D4 D3 D2 D1 D0
0/1 1 0 DATA
RE A0 WR D7 D6 D5 D4 D3 D2 D1 D0
0/10000000000
RE A0 WR D7 D6 D5 D4 D3 D2 D1 D0
0/1000000****