Specifications

EPSON 7–17
SED1234/35 Series
SED1234/35
Series
COMMANDS
Table 4 shows a command list. In the SED1230 Series,
each data bus signal is identified by a combination of A0
and WR (E).
Command interpretation and execution are performed by
only internal timing. This permits high-speed process-
ing.
• Outline of Commands
The execution time of each instruction is determined by
the internal processing time of the SED1230 Series.
Accordingly, to execute instructions in succession, reserve
a time exceeding the cycle time (t
cyc) and execute the
next instruction.
• Outline of Commands
(1) Cursor Home
This command presets the address counter to 30H.
When the cursor is displayed, this command moves
it to column 1 of line 1.
(2) Display ON/OFF Control
This command performs display and cursor setting.
Note: Control the symbols that are driven by COMS1
and SEGS1, by the Static Display Control
command.
D = 0 : Display OFF
1 : Display ON
DC = 0 : Double cursor OFF
1 : Double cursor ON
A0 WR D7 D6 D5 D4 D3 D2 D1 D0
000011CBDCD
A0 WR D7 D6 D5 D4 D3 D2 D1 D0
000001****
* : Don't Care
B = 0 : Cursor blink OFF
1 : Cursor blink ON
In the blink state, display characters in normal
video and display characters in monochrome re-
verse video are displayed alternately.
The repetition cycle of alternate display is about 1
second.
C = 0 : Non-display of cursor
1 : Display of cursor
The relationship between C and B registers and
cursor display is shown in the following table.
The cursor display position corresponds to the
position indicated by address counter.
Accordingly, to move the cursor, change the address
counter value by the RAM Address Set command
or auto increment by writing RAM data.
If the address counter is set at the symbol register
position with (C, B) = (1, 0), symbols can be caused
to blink selectively.
(3) Power Save
This command is used to control the oscillating
circuit and set and reset sleep mode.
PS = 0 : Power save OFF (reset)
1 : Power save ON (set)
O = 0 : Oscillating circuit OFF (stop of
oscillation)
1 : Oscillating circuit ON (oscilla
tion)
Command type Command name A0 WR
Display control Cursor Home 0 0
instruction Display ON/OFF Control 00
Power control Power Save 0 0
Power Control 0 0
Electronic Volume 0 0
Register Set
Address control Address Set 0 0
instruction
Data input Data Write 1 0
instruction
C B Cursor display
0 0 Non-display
0 1 Non-display
1 0 Display in monochrome reverse
video
1 1 Alternate display of display charac
ters in normal video and display
characters in monochrome reverse
video
A0 WR D7 D6 D5 D4 D3 D2 D1 D0
000100**OPS
* : Don't Care