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CIRCUIT DESCRIPTION
To PLL
m
1OM
l M l o o k lOk
5 K
4bit 4bit 4bit
f
Micro-processor Q18
,NT
-
_
KEY. M.SEL Sw~tch C2-181
STEP swltch
C24Bo
C
E
D
P.0 swltch
Cz-62
P.A swltch
c2-63
-
REV, swltch
C~+BI
~2
I
-
f f l m s
2
st
-
.-
m
vr
J
c
r
>
Tone encoder
P
'E
Latch 0 1
7
Decoder driver
Q28
" ' v r
a
c
Q16
\
KEY BOARD
\ -
4 digit LED for F. display
Fig. 7 Control Unit block diagram
x
=
Don't care.
=
No change In state of latch.
Z
=
High impedance.
Qn
=
State of addressed latch.
Fig. 8 Function diagram of M C 1 4 5 9 9 B (Control unit: 0 1 7 )
Table 9. Truth table (Control Unit: 0 1 7 )
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