Casio CZ-1 - 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
/-Sua
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