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2-1. hPD75217 Terminal signal
No.|[
Name
Description
T/o
T
ss
Kéy
strobe/Display
tube
segment
signal
(d)
out
2]
s2
Key
strobe/Display
tube
segment
signal
(c)
out
3]
$2
Key
strobe/Display
tube
segment
signai
(b)
out
4|
so
Key
strobe/Display
tube
segment
signal
(a)
out
5 | POO
Power
off
signal
in
6 | Pol
Print
data
shift
clock
output
out
7 | Boz
Print
data
output
out
8 | Po3
Key
return
signal
in
3]
a
Printer
timing
signal
input
in
10]
P11
Key
return
signal
in
Ir | Piz
Key
return
signal
in
12 | P13
Key
return
signal
in
13 |. -cs1
RAM
chip.
select
signal
out
14 [° -wE
RAM
write
signal
out
15 | P22
Printer
motor
on
signal
out
16 | P23
Drawer
open
signal
out
17 | P30
Mode
switch
return
in
18]
P31
Key
return
signal
in
19 | P32
Address
latch
enable
for
RAM
out
20 | A12
RAM
Address
bus
Al2
out.
21
AB
RAM
Address
bus
Aé
out
22
AD
RAM
Address
bus
A9
out
23
All
RAM
Address
bus
All
out
24
ALO
RAM
Address
bus
Al0
out
25
DI/A0
Data
bus
D2/Address
bus
_Al0
in/out,
26
D6/A:
Data
bus
Dl/Address
bus
Al
in7out
27
DS/A4
Data
bus
DO/Address
bus
A4
in/out
28
D4/A2
Data
bus
D7/Address
bus
A2
in/out
29
PPO
Buzzer
signal
out
30
XL
X'tal
terminal
4.19MHz
in
31
X2
X'tal
terminal
4. 19MHz
in
32
vss
GND
in
33
xTL
Timer
X'tal
terminal
32.768KHz
in
34
XT2
Timer
X'tal
terminal
32.768KHz
in
35
DO/A7
Data
bus
DO/Address
bus
A7
in/out.
6
DIZA'
Data
bus
Di/Address
bus
A6
in/out
37
D2/A5
Data
bus
D2/Address
bus
AS
in/out
38
D3/A3
Data
bus..D3/Address.
bus
A3
in/out
39
~RESET
Reset
signal
input
in
40
TO
Display
tube
1st
digit
drive
signal
out
Hitt}
bisslay tubs and digit drive signal ———
out
a2 | T2
Display
tube
3rd
digit
drive
signal
out
43 | T3
Display
tube
4th
digit
drive
signal
out
44]
T4
Display
tube
5th
digit
drive
signal
out
45 | TS
Display
tube
6th
digit
drive
signal
out
a6
TS
|—
Display
tube
7th
digit
drive
Signal
out
47 | 17
Display
tube
8th
digit
drive
signal
out
48}
T8
Display
tube
9th
digit
drive
signal
out
a9 | T9
NU
50 | PH3
NU
Si | PHZ
Wo
2 | PHL
Printer
magnet
data
output
enable
signal
out
53 | PHO
Printer
magnet
data
strobe
signal
out
54]
Sil
Key
strobe
signal
out
55.|
S10
Key
strobe
signal
out
[se
+ Vioad
Power
(-20V)
for
display
in
57 | Vpre
Power
(-4V)
for
display
in
58]
59
Key
strobe
signal
out
59]
58
Key
strobe
signal,
Display
tube
segment
(¥)
out
60 | S87
Key
strobe/Display
tube
segment
(DP)
signal
out
ei | 56
Kéy
strobe/Display
tube
Segment
signal
(9)
out
62 | s5
Key
strobe/Display
tube
segment
signal
(f)
out
63;
S4
Key
strobe/Display
tube
segment
signal
(e)
out
64 | vpDD
Power
(+5V)
in
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