Casio CZ-1 Service Manual And Spare Parts List page 103

16.
PIN
FUNCTION OF MUSIC
LSI (jiPD933AC)
Pin
No. Ttrminal
Namt
In/Out
Function
1
wl
In
Writt tnabla ttrminal.
At
LOW,
tht LSI rtctivts data
from
SUB
CPU.
2
WS
In
Writa ttrobo
urmiral.
SUB CPU
writt* data into
Music LSI
at tht rising
tdgo of tht
signal.
3
RQ
Out Rtqutst
signal ttrminal.
At LOW.
4 10 In
Inttrrupt distnablt ttrminal.
At
LOW*
tht
LSI
rtotivts inttrrupt
mask
signal.
6
M/S
In
Masttr or Slave dtttrmination ttrminal.
Whan LOW,
tht LSI
btcomts
Slavt
LSI whilt
it
btoomts Mastar LSI
whtn
tht ttrminal
is
HIGH.
7
SYC
In/Out
Synchronous
signal input/output ttrminal.
Tht
synchronous
signal
is
stnt
from Masttr LSI
to Slavt LSI.
8
cue
In
4.48
MHi
clock pulst input.
10
GND
Ground
(OV) sourct.
11
RST
In
Rsstt
signal input.
Normally
tht ttrminal stays
LOW.
At powtr
ON,
tht
ttrminal
fists
to
HIGH
Itvtl
for
a
whilt and tht
inttrnal circuits
of tht
LSI art
initiallxtd.
12
OOE
In/Out Data output tnabla ttrminal.
At HIGH,
digital
sound
signals
art output
from
Mastar LSI whilt Slavt LSI outputs
sound
signal at
LOW
Itvtl.
13
SH Out 40
KHz
sampling
signal for
Samplt
&
Hold
circuit.
15*17
001*00?
Out
Control
signals for
Expander
circuit.
18*20
004*0015
Out
12-bit digital
sound
signals.
30
VOO
+5V powtr
sourct.
31-38
0B7
*
OBO
In/Out
8-bit data
bus bttwttn Music LSIs and SUB
CPU.
39 CS
In Chip
stltct ttrminal.
At
LOW,
tht LSI
is
dtsignatad by
SUB
CPU.
40
RD
In
Rtad
data ttrminal.
At LOW,
tht
LSI stnds data
to
SU8
CPU.
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