Specifications

8–22 EPSON
SED1240 Series
pulses at least for 10 µs as described in DC Characteristics.
The ordinary operation will be started in 1 µs or more
after the rising edge of the RES signal. When the RES pin
becomes active, each register will be cleared and set to
the above setup status.
If initialization is not executed by the RES pin when the
supply voltage is applied, a clear disable status may
appear.
In case the built-in liquid crystal power circuit is not
used, the RES input must be active when the external
liquid crystal power supply is turned on.
DESCRIPTION OF COMMANDS
Table 7 shows a command table. The SED1240 series
identifies each data/command by a combination of A0
and WR (E).
An extended command can be selected by the RE bit in
the command.
Interpreting and executing commands are performed
only at the internal timing. This permits high-speed
processing.
Overview of Commands
The execution time of each instruction is determined by
the internal processing time of the SED1240 series.
Accordingly, for executing an instruction, secure a time
exceeding the cycle time (tcyc) and then execute the
instruction.
Table 7
Command type Command name RE A0 WR
Display control instructions Cursor Home 0 0 0
Display ON/OFF Control 0/1 0 0
Line Blink Control 0 0 0
Line Scroll Control 1 0 0
Static Icon Display Control 0 1 0
Static Icon Display Blink Control 0 1 0
Vertical Double-size Display Control 1 0 0
Power control Power Save 0/1 0 0
Power Control (1) 0 0 0
Power Control (2) 1 0 0
Electronic Volume Control 0 1 0
System set System Set (1) 0 0 0
System Set (2) 1 0 0
Address control instructions DDRAM, Symbol Register 0 0 0
CGRAM 1 0 0
Data input instruction Data Write 0/1 1 0