Hitachi D-E99 Service Manual page 20

·E99
2. IC404 (µPDSSOC 062, for counter with stopwatch)
Pin
Pin Symbol
Function
No.
•
1
CLOCK 1
• The external resonance circuit is coupled with these pins to operate the built-in clock
oscillation circuit which is the reference of the microprocessor operation, and the oscil-
28 CLOCK 0
lation frequency is set to 400 kHz.
2
TIMER CLEAR
• Elapsed time indication timer (stopwatch indication) zero clear input pin. Inputs Lo
potential normally and outputs Hi potential during button operation.
3
a
• Fluorescent display tube plate segment drive output pins. The Hi potential output
l
l
segment is lit synchronized with the grid select signal.
9
g
~t
b
d
f
I c o
a c
e
9
0
1 1 1 1 1 1 0
1 0 1
1
0 0 0 0
2 1 1 0 1
1
0
1
a
3 1 1
1 1 0
0
1
4 0 1 1 0 0 1
1
'$t
e c
5
1
0
1 1 0 1 1
6 1 0 1
1 1 1 1
d g
t
7
1 1 1
0
0 0 0
8 1 1 1 1
1 1 1
9 1 1 1 1 0
1 1
- 0
0 0
0 0
0
1
•
10
9
• Fluorescent display tube dynamic drive grid select (for display digit scanning) data output
I
I pins, and the display of the Hi potential output digit is lit.
13
5
~
Tape counter
Elapsed time
16 4
3 rd 2 nd 1 st 10 1 -
10 sec
1
sec
l
I
n
digit
digit digit
minute minute
19
1
1(pin@)
0 0 0 0 0 0 0
1
2(pin@)
0
0
0 0 0
0
1 0
3(pin@) 0
0
0 0 0 1 0 0
4 (pin
(i6) )
0 0 0
0
1 0
0 0
5 (pin
@) )
0
0
0 1 0 0 0 0
7(pin@)
0 0 1 0 0 0
0 0
B(pin@)
0 1 0 0 0 0 0 0
9 (pin
@) }
1
0 0 0 0 0 0 0
14
Vss • Hi side power pin. Applies
+
10V.
15
TEST
• Microprocessor test pin. Connected to Vss pin because this is not used.
20
NC
·Blank pin.
21 FF SOL.
• Mechanism operation (solenoid operation) detection input pin. Addition/subtraction
22 REWIND SOL.
to/from the tape counter or addition of the elapsed timer is executed by inputting, and
displayed to the fluorescent display tube.
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