Casio CZ-1 Service Manual And Spare Parts List page 94

Pin
No. Tarminal
Nam*
In/Out
Function
12-10
DB0~DB7
In/Out Data but
(DO
~
D7) batwaan
MSM6200.
20
Vtt
Ground
(0V) touroa.
26
voo
+6V
sourca.
27-34 P10-P17 Out
Dm
but (00
~
07) batwaan Main CPU.
36
P25 (CNT49)
In
Control
signal
input
from CPU.
37
P26 (INT49)
Out
Inttrrupt signal
output to
CPU.
38
P27 (WR49) Out Timing
pulsa
output
for
data raad/writa.
39 T1 (TST) In
Ttst
signal
input.
Kay
intarfaca
LSI dots salfchack of intarnal
RAM/ROM
at
LOW.
40
VCC
|
5V
sourca.
11-6.
Kay Touch
Data
Communication
(1)
Block Diagram
<3d
02
03
55
04
KC1A
-J 06
KC2B
§
^
101
103
103
104
«
11
01
12
* s
14
13
16
I/O
RESE
From
rasat circuit
Kay
touch
control LSI fatchas tha data of
kay
antry
and kay touch
spaed
from
keyboard, than
the data are transmitted to Main
CPU
via
Kay
interlace LSI
which
is
a buffer.
The Key
interface LSI quicken
the data
communication between
the
Key
touch
control LSI
and
the CPU.
.33-