Specifications

4–2 EPSON
SED1220
BLOCK DIAGRAM
Input buffer
MPU interface
Address counter
Command
decoder
Cursor control
SEG driving circuit
Static icon drive circuit
COM driving circuit
Refresh address counter
DD RAM
symbol
register
CG ROM
CG RAM
Timing generatinon circuit
Oscillator
LCD power circuit
IF
RES
CS
WR (E)
P/S
A0
SEG1~60 SEGS1, 2, 4, 5
COMSA SEGSA, B, C, D, E SEGSA, B, C, D, E, F, G, H, I, J (SED122A)
COM1~24 (SED1220/1221) COM1~16 (SED1222/122A) COMS1, 2
V
1
V
2
V
3
V
4
V
5
CAP1+ CK CAP1– CAP2+ CAP2– V
R
V
OUT
V
S1
D6 (SCL)
D0 D1 D2 D3 D4 D5 D7 (SI)