Specifications

SED1230
Series
EPSON 6–21
SED1230 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, re-
serve 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) Static Display Control
This command selects display or non-display of
static display symbol, and blink ON or OFF. This
command is effective in the standby mode only.
SD1, SD2 = 0, 0 : Display OFF
0, 1 : Blink (1 ~ 2 Hz)
SD1, SD2 = 1, 0 : Blink (3 ~ 4 Hz)
1, 1 : All Display ON
Command type Command name A0 WR
Display control Cursor Home 0 0
instruction Static Display Control 0 0
Display ON/OFF Control 0 0
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
A0 WR D7 D6 D5 D4 D3 D2 D1 D0
00 0001****
* : Don't Care
(3) 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
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 ad-
dress 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.
A0 WR D7 D6 D5 D4 D3 D2 D1 D0
00 0010**
SD1 SD0
∗ : Don't Care
A0 WR D7 D6 D5 D4 D3 D2 D1 D0
000011CBDCD
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