8–24
EPSON
SED1240 Series
Command
Code
Function
RE
A0
WR
D7
D6
D5
D4
D3
D2
D1
D0
(3) Display
0/1
0
1
C
B
RE
D
Sets cursor ON/OFF, cursor blink ON/OFF (B),
ON/OFF/
display ON/OFF (D), use/no-use of extended register
Extended
(RE), and electronic volume LBS (RE).
Register
C= 1
(cursor ON)
C = 0
(cursor OFF)
ON/OFF
B = 1
(blink ON)
B = 0
(blink OFF)
Control
D = 1
(display ON)
D = 0
(display OFF)
RE = 1 (extended
RE = 0 (extended
register ON)
register OFF)
(4) Power
0/1
0
1
0
*
0
PS Sets power save ON/OFF (PS) and oscillating circuit
Save
ON/OFF (O).
Control
PS = 1 (power save ON) PS = 0 (power save OFF)
O = 1 (oscillation ON) O = 0 (oscillation OFF)
(5) Power
0
1
0
1
HPM VC
VF
P
Sets high power mode ON/OFF (HPM), voltage
Control
regulating circuit ON/OFF (VC), voltage follower ON/
OFF (VF), and boosting circuit ON/OFF (P).
HPM = 1 (high power
HPM = 0 (high power
mode ON)
mode OFF)
VC = 1 (voltage
VC = 0 (voltage
regulating
circuit ON)
circuit OFF)
VF = 1
(voltage
VF = 0
(voltage
follower ON)
follower OFF)
P = 1
(boosting
P = 0
(boosting
circuit ON)
circuit OFF)
1
0
1
0
1
IRS BAS IR1
IR0 Sets V5 voltage regulating resistor selection (IRS),
LCD bias set (BAS), and V5 voltage regulating built-in
resistor ratio set (IR1, IR0).
IRS = 1 (use of built-
IRS = 0 (no use of built-
in resistor)
BAS = 1 (1/4 bias)
BAS = 0 (1/5 bias)
(IR1, IR0) =
...
(Rb/Ra ratio
(11, 10, 01, 00)
large to small)
(6) System
0
1
0
R1
R0
CS
CG Sets ROM option (R1, R0), use/no use of CGRAM
Set
(CG), and COM shift direction (CS)
CG = 1 (use of
CG = 0 (no use of
CGRAM)
CS = 1 (right shift)
CS = 0 (left shift)
1
0
1
0
*
SS
*
Sets the normal/reverse display (SS) of each segment
character.
SS = 1 (reverse)
SS = 0 (normal)
(7) RAM
0
1
ADDRESS
Sets the address of DDRAM, static icon RAM or
Address
electronic volume RAM.
Set
1
0
1
ADDRESS
Sets the address of CGRAM or symbol register RAM.
R1
R0
Function
0
Standard ROM + OPTION ROM1
0
1
Standard ROM + OPTION ROM2
1
0
Standard ROM + OPTION ROM3
1
Standard ROM + OPTION ROM4