Specifications

8–32 EPSON
SED1240 Series
Power control (1)
Function: Controls the operation of the built-in power
circuit.
• Boosting circuit ON/OFF is specified by setting P.
For operating the boosting circuit, the oscillating
circuit must be in operation.
P = 0 : Boosting circuit OFF
P = 1 : Boosting circuit ON
• Voltage follower ON/OFF is specified by setting VF.
VF = 0 : Voltage follower OFF
VF = 1 : Voltage follower ON
• Voltage regulating circuit ON/OFF is specified by
setting VC.
VC = 0 : Voltage regulating circuit OFF
VC = 1 : Voltage regulating circuit ON.
• High power mode ON/OFF is specified by setting
HPM.
HPM = 0 : High power mode OFF
HPM = 1 : High power mode ON
Power control (2)
Function: Controls the operation of the built-in power
circuit.
• The relation of IR0 and option combinations is shown
in the following table.
• Bias selection is performed by setting BAS.
BAS = 0 : 1/5 bias
BAS = 1 : 1/4 bias
• Either built-in V5 voltage regulating resistor or external
resistor (no use of built-in resistor) is selected by
setting IRS.
IRS = 0 : No use of built-in resistor
IRS = 1 : Use of built-in resistor
System set (1)
Function: Selects an option ROM and sets the common
shift direction and the use/no use of CGRAM.
• The relation of R1 and R0 combinations is shown in
the following figure.
• The COM shift direction is specified by setting CS.
CS = 0 : COM left shift
(COM1 → COM32 →
COMS1 → COMS2)
CS = 1 : COM right shift
(COM32 → COM1 →
COMS1 → COMS2)
• The use/no use of CGRAM is specified by setting CG.
CG = 0 : No use of CGRAM
CG = 1 : Use of CGRAM
System set (1)
Function: sets the normal/reverse display of SEG
characters.
This function operates for each character.
• The normal/reverse display of SEG is specified by
setting SS.
SS = 0 : Normal display of SEG
SS = 1 : Reverse display of SEG
• For the symbol register RAM output, only the normal
display is available.
IR1 IR0 (1 + Rb/Ra)
0 0 Small
01
↓
10
1 1 Large
R1 R0 ROM combination
0 0 Standard ROM (160 characters or
154 characters)
+ option ROM1 (96 characters)
0 1 Standard ROM (160 characters or
154 characters)
+ option ROM2 (96 characters)
1 0 Standard ROM (160 characters or
154 characters)
+ option ROM3 (96 characters)
1 1 Standard ROM (160 characters or
154 characters)
+ option ROM4 (96 characters)
RE A0 WR D7 D6 D5 D4 D3 D2 D1 D0
0000101
HPM VC VF P
∗ : Don't Care
RE A0 WR D7 D6 D5 D4 D3 D2 D1 D0
1 0 0 0 1 0 1 IRSBAS IR1 IR0
∗ : Don't Care
RE A0 WR D7 D6 D5 D4 D3 D2 D1 D0
0000110R1R0CSCG
RE A0 WR D7 D6 D5 D4 D3 D2 D1 D0
1000110**SS*
∗ : Don't Care