-2-
Pin Signal
In
/
Out
Function
standby=
power
off
No. name
1
V1
In
LCD
driv
i
ng power
2
V2 In
LCD driving power
3
V3
In
LCD driving Power
4 V4 In
LCD
d
r
iving Power
5
V5 Out
E
x
pansion RAM chip
enable
,
normally high, (Not used
w
i
th the PC-1246.)
6 VDD Out
LCD drive power, high during standby.
7
GND
In
Power supply
8
VGG
In
Power supply, normally low
9 X1 Out
System clock oscillation
output
10
X2 In
System clock oscillation
input
11
X3 Out
D
i
splay clock oscillation
output
12 X4
In
Display clock oscillation
input
13
K1
In
Key
input,
normally low
14 K2 In
Key
input
,
normally low
15 K3
In
Key
input
,
normally low
16 K4 In
Key
input,
normally low
17
K5
Out
(SEL2) Select signal
output
18
K6
Out (SEL
1)
Select signal
output
19 K7
In
ACK
s
i
gnal. Enables the
1
/
0
(PCU)
to
read data
from
the
CPU
.
20
KB
In
Data
in
.
Serial data input
from
the PCU
(bit
-
to-bit
serial handshake)
21
RESET
I
n
Reset
input,
normally pulled down to low level. Reset when high.
22
Cl
In
Option cassette tape recorder interface
input
23
co
Out
Option cassette tape recorder interface
signal
/
buzzer signal
output
24
R
/
W
Out
Write clock, normally high
25
DI01
In
/
Out
Data bus, normally low
I I
2
2
32
DIOB
In
/
Out
Data bus,
normally
low
33
B1
Out
Address
bus
,
low during
standby
.
Also
,
used
for
periphe
r
al
data
output port
(Dout).
2
2
2
2
43
B11 Out
Address
bus
,
low during
standby
.
Also, used
for
peripheral data
output port
(Dout)
.
44 B12 Out
Basic RAM chip enable
45 B13 Out
Busy interface
output port
46 S40
Out
LCD segment
signal
/
key
strobe
,
low or high during standby and 4-level pulse during
d
i
splay.
2
'
2
I
2
85
S1
Out
LCD segment
signal
/
key
strobe
,
low or high during stnadby and 4-level pulse during
display
.
86 H16 Out
LCD backplate
s
i
gnal
,
low or high during standby and 4-level pulse during display.
2
2
2
2
100
H1
Out
LCD backplate
signal
,
low or high during standby and 4-level pulse during display.
•
CPU signal
descr
i
ption
A
100
-
pin
,
4-bit, microprocessor
used
in this model
has
a
17KB ROM and display chip
within
the
chip
.
What
it
differs
from
the
conventional microprocessor
is
that
i
t
has
no iternal RAM but
uses
an external RAM
for
execut
i
on.
4.CPU(SC61720D03)
-
PC-1246
PC-1247
To Next Page
Loading...
Need help?
General
