Casio CZ-1 Service Manual And Spare Parts List page 93

11-3.
Pin Functions of
Kty Touch
Control LSI
(MSM6200)
Pin No. Terminal
Name
In/Out Function
1-6
IR6
-
IC8
In/Out Exttfnil
RC
discharging
circuit
inputs
and
outputs.
10
REF
Raftranca voltage (+5V).
11
AG
Analog
ground.
*u
HI
Out
1
marmot
raauMt
tional
out out
Whan LOW, MSM6200
intarrupts tha
CPU.
26-28
29-32
02-05
101
—
104
Out
In/Out
Uppar
4-bit
data bus.
Lowtf
4-bit data bus.
Q2
03 04 OS
101
102 103 104
MSB
LSB
34
1
2 In
alb
I
mo
or 0ii
L#icn
cnwiii
sigmi inpui.
Whan HGIH.
addrass
in
MSM6200
is
assigned.
35
13
In
vVR
signal
input.
Whan LOW.
data
or
addrass can ba written
in
MSM6200.
36 14
In
TO
signal input.
Whan LOW, CPU
raads
data from
MSM6200.
37 16
In
GTiehip
salact) signal input.
Whan LOW,
communications batwaan tha
CPU
and
MSM6200
is
possibla.
38
1
10 In Rasat
signal input.
LOW:Actiwa.
At powar
on,
racaivas
a
rasat signal
to
initialize
MSM6200'*
intarnal
circuits.
40
VOO
6
volt sourca.
43 PCI
In
Clock
pulsa (2.47
MHz)
input.
46 VSS2 Ground
(0 volt) sourca.
46 VSS1 2.25
volt sourca.
47-60 KC2B-KC1A
Out Kay
common
signal outputs.
68-48 K8
-
K38
In
Kay
input
terminals.
91-100
IR1
-
IC6 In/Out
External
CR
circuits
inputs and
outputs.
11-4. Pin Functions of
Kay
Inttrfeco LSI (*iPD8049HC)
Pin No.
Terminal
Name
In/Out Function
1
TO
In Clock
pulsa input for
data read/write.
2
XTAL1
In
8.96
MH
dock
pulsa input.
4 RESET
In
At powar ON,
tha terminal stays
LOW
level for a while
in
order
to
initialize internal
circuits.
6
mr
In
Interrupt
signal
input from
MSM6200.
8 TO
Out
Read
signal output.
Key
Interface
LSI reads data
from
MSM6200
when
terminal
Is
LOW.
10
WR
Out
Write
signal output.
Kay
Interfeoa LSI write* data or address
in
MSM6200
when
terminal
to
LOW.
11
ALE
Out
ALE
(Addrass Latch Enable)
signal
output.
Address
in
MSM6200
Is
assigned
whan HIGH
level.
-32-