Specifications
8–24 EPSON
SED1240 Series
Command
Code
Function
RE A0 WR D7 D6 D5 D4 D3 D2 D1 D0
(3) Display 0/1 0 0 0 0 1 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 0 0 1 0 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 0 0 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 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 0 0 1 0 1 IRS BAS IR1 IR0 Sets V
5
voltage regulating resistor selection (IRS),
LCD bias set (BAS), and V
5
voltage regulating built-in
resistor ratio set (IR1, IR0).
IRS = 1 (use of built- IRS = 0 (no use of built-
in resistor) 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 0 0 0 1 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) CGRAM)
CS = 1 (right shift) CS = 0 (left shift)
1 0 0 0 1 1 0 * * SS * Sets the normal/reverse display (SS) of each segment
character.
SS = 1 (reverse) SS = 0 (normal)
(7) RAM 0 0 0 1 ADDRESS Sets the address of DDRAM, static icon RAM or
Address electronic volume RAM.
Set 1 0 0 1 ADDRESS Sets the address of CGRAM or symbol register RAM.
R1 R0 Function
0 0 Standard ROM + OPTION ROM1
0 1 Standard ROM + OPTION ROM2
1 0 Standard ROM + OPTION ROM3
1 1 Standard ROM + OPTION ROM4