Casio CZ-1 Service Manual And Spare Parts List page 102

15.
MUSIC LSU ACCESSES
CZ-1
employs
two Music
LSIs,
Master LSI
and
Slave LSI.
which
are controlled
by
SUB
CPU.
Matttf LSI
X o
Q
a.
&
CO
D
in
(1)
SUB CPU
c{>
Music LSI
worTiTISTL—
To
OAC
To
othtr
circuit
-MutklSl
chip wtMti<
P84|wl)
|*
SU1 CPU
wriui
aiu
into
ow
ol
Munc LSU -
VOIWSI
/-Su a CPU
writs* data
«t
nut
i_^~i_r~L_r
—
_ _ _
Ow
unit of
oau ccmmi
of 3-bytt
tioiwjtt.
D
*
MtM
'
"")
(
CommnT"y
Upptfd»tT"y Lowr <Hu
^
(2)
Music LSI ={>
SUB CPU
PC2(a5T"
By
rocoivina •
iignot
Irom
PBO
or
P81
,
SUB CPU
dMCfimintCM
wnicft LSI roquttu mitrrupt.
T—
Muiic LSI
interrupt!
SUB CPU
»J
PB2
»f
PB3
iGTl
ire
1:
Upon
rtcglpt of incorrupt tionol,
SUB CPU
t»)ostt LSI
SUB CPU
rto*
dm
from
Mm
tic
LSI