Specifications

EPSON 5–13
SED1225 Series
SED1225
Series
The following provides the relationship between the C
and B registers and cursor display.
(C, B) = (0, 0) (1, 0) (1, 1)
fBLNK
The cursor display position is indicated by the address
counter. Accordingly, to move the cursor, change the
address counter value by automatic increment by writing
the RAM address set command or RAM data.
The following shows the relationship between the DC
resistor and display:
(1) N=0 (1/26 duty)
. . . . . .
. . .
. . .
. . .
DC=0 DC=1
1st column 1st column12th column 12th column
COM1–
1st line
2nd line
3rd line
COM24–
COMMAND
Table 4 lists the supported commands. The SED1225
identifies a data bus by a combination of A0, XWR and
E signals. It features high-speed processing as the
commands are analyzed and executed in the internal
timing only.
• Command outline
Command type Command name A0 XWR
Display control Cursor Home 0 0
instruction Display On/Off Control 0 0
Power control
Power Save 0 0
Power Control 0 0
System setup System Setup 0 0
Address control
Address Setup 0 0
instruction
Data input
Data Write 1 0
instruction
Table 4
As the execution time of each instruction depends on the
internal processing time of the SED1225, an enough time
greater than the system cycle time (
tcyc) must be assigned
for continuous instruction execution.
• Explanation of commands
(1) Cursor Home
The Cursor Home command presets the Address
counter to 30H, and shifts the cursor to column 1
of line 1 if Cursor Display is ON.
(2) Display On/Off Control
The Display On/Off Control command sets the
LCD character and cursor display.
D=0: Turns the display off.
D=1: Turns the display on.
DC=0: Selects the standard size display.
DC=1: Selects the double-height vertical display.
B=0: Turns cursor blinking off.
B=1: Turns cursor blinking on.
During blinking, the cursor character is alternately
displayed normally and reversely. The normal and
reverse display is repeated approximately every one
second.
C=0: Does not display the cursor.
C=1: Displays the cursor.
A0 XWR D7 D0
000001✽✽✽✽
✽ : Don’t Care
A0 XWR D7 D0
000011CBDCD
✽ : Don’t Care
C B Cursor display
0 0 Not displayed
0 1 Not displayed
1 0 Underbar cursor
11
Alternate character display
normally and reversely