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SC802A
VER2.1
Akihabara Inc. www.akiba-tech.com
Page 6 of 6
TIMING CHARACTERISICS
DB 0 ~ DB 7
R/ W
RS
tr
th 1
ts u 2
tc
Va l i d Da t a
th 2
tw
tf
th 1
E
ts u 1
Write Timing
ts u
E
DB 0 ~ DB 7
R/ W
RS
tr
th
tc
V a lid D a ta
td
td h
tw
tf
th
Read Timing
5. Operating Principles
a) Pin description
Pin NO.
Symbol
Level
Function
1
VSS
0V
Ground
2
VDD
2.7V~5.5V
Supply voltage for logic
3
V0
Variable voltage for LCD
4
RS
H/L
H: Instruction code
L: Data
5
R/W
H/L
H: Read signal L: Write signal
6
E
H→L
enable signal
7
DB0
H/L
8
DB1
H/L
9
DB2
H/L
10
DB3
H/L
11
DB4
H/L
12
DB5
H/L
13
DB6
H/L
14
DB7
H/L
Data bits
In case of
4 bits instruction, data is
transferred by twice using only 4 buses of D4
– D7 ,and D0 – D3 are not used
,
first
operation is higher order
4 bits and
second
is
lower
4
bits of
8 bits ,
but in case
of
8
bits
instruction
, data
is
transferred by
data by
data bus
of
D0 –
D7
15
16
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