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Other Interface - Sharp MZ-350C Service Manual

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M Z 3500
8. OTHER INTERFACES
8-1. Clock Circuit
1) Schematic
j;
10
M2
i i | U
fi?„
h
l I
l<h
~~
Vcc
*
J . 3 2 K H ,
< r
i
l
l
T E S T f
,
N
I
I
I
I
M.f.-*
2) Clock timing
READ
HOLD .
READ
,
SH1FTmode
y
mode
mode
j
mode
|
"
//
Cn(CO~C2)
0
X
HOLD
(Tsode
WRITE
HOLD
mode
mode
Tens digit of seconds
SHIFT mode
Tens digit of month '
SHIFT mode
Cn(CO~C2)
0
STB
^Ones digit of seconds
DI N
Don'tcare
X A>
X
t
CLK
\
i
I)OUT
J_
Tens digit of seconds
SET
i
HOLD
mode
mode
Don't care
XZHZXZ1
Tens digit of month''
- 81 -

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