Specifications

10–2 EPSON
SED1280
Number Name Description
1VSS Ground
2 to 6 V1 to V5 LCD controller power supply inputs
7 LP Data latch pulse output
8 XSCL Data transfer clock
9VDD 5 V supply
10 FR LCD AC controller output
11 DO Serial data output
12 SCK 1 MHz system clock input
13 SID Serial data input
14 RST Reset input
15 to 24 SWC10 to SWC1 Key-scan inputs
25 to 30, 32, 33 SWS8 to SWS1 Multiplexed key-scan and LED output ports
34 to 36 EI3 to EI1 Expanded input ports
37 to 41 LE5 to LE1 LED controller outputs
42 SOD Key- and expanded-input port status serial data output
43, 44 EO2, EO1 Expanded output ports
45 to 60 COM1 to COM16 Common driver outputs
61 to 100 SEG40 to SEG1 Segment driver outputs
BLOCK DIAGRAM
Address
register
Timing
generator
Receive
buffer 1
Receive
buffer 2
Address
decoder
Input
controller
SOD
driver
1/4 driver
Test mode
register
Expansion output
port register
Expansion input
port register
Input buffer
Key input
buffer
Chatter
protection
Key register
LE driver
SWS
decoder
SWS1
to
SWS8
SID
SCK
SOD
LE1
to
LE5
SWC1
to
SWC10
EI1
to
EI3
EO1
EO2
SEG1
to
SEG40
COM1
to
COM16
Output buffer
Instruction
register
1278 core
8
Data
register
BUSY
detector
1278 write
control
LED register
SWS
generator
Address
counter
Key-scan
counter
SOD output
controller
PIN DESCRIPTION