2-20
2.1.5.3
Parallel port interface circuit
The IT8673F is used as a parallel port control.
The parallel port of the IT8673F has a both-way function. When controlled by software, the data signals of the PD7-PD0 become
both-way signals.
The output signals (SLIN, INIT, AFD, STB) for parallel port control are pulled up with 4.7k
Ω
of open drain output. However, since
they are connected to the power supply terminal through diodes, Device 74LS07 is inserted at an external open collector buffer.
I/O address and interrupt of the parallel port are set up by the software.
+5V
4.7K
4.7K
22K
47K
LS07
PD7
105
106
107
108
109
110
111
112
113
114
116
117
115
100
102
101
103
PD6
PD5
PD4
PD3
PD2
PD1
PD0
SLIN
INIT
AFD
STB
ERR
S LCT
BUSY
PE
ACK
22K
22K
47K
M A 1 5 2 W A
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
9
8
7
6
5
4
3
2
17
16
14
1
15
13
11
12
10
18
19
20
21
22
23
24
25
D 7
D 6
D 5
D 4
D 3
D 2
D1
D 0
S L I N #
I N I T #
A F D #
S T B #
E R R #
S L C T #
B U S Y
P E
A C K #
G N D
IT8673F
Summary of Contents for JS-170FR Series
Page 2: ......
Page 10: ......
Page 30: ...1 20 ...
Page 80: ...2 50 ...
Page 101: ...3 17 LCD DISPLAY TEST 6 Video Test ENTER 1 OK or 2 NG ...
Page 134: ...4 JS 170FR PCB s 4 1 Main PCB 4 1 1 Main PCB Schematic Diagram 1 10 4 1 ...
Page 135: ...4 1 1 Main PCB Schematic Diagram 2 10 4 2 ...
Page 136: ...4 1 1 Main PCB Schematic Diagram 3 10 4 3 ...
Page 137: ...4 1 1 Main PCB Schematic Diagram 4 10 4 4 ...
Page 138: ...4 1 1 Main PCB Schematic Diagram 5 10 4 5 ...
Page 139: ...4 1 1 Main PCB Schematic Diagram 6 10 4 6 ...
Page 140: ...4 1 1 Main PCB Schematic Diagram 7 10 4 7 ...
Page 141: ...4 1 1 Main PCB Schematic Diagram 8 10 4 8 ...
Page 142: ...4 1 1 Main PCB Schematic Diagram 9 10 4 9 ...
Page 143: ...4 1 1 Main PCB Schematic Diagram 10 10 4 10 ...
Page 144: ...4 1 2 Main PCB Parts Location 4 11 ...
Page 145: ...4 2 MB PCB 4 2 1 MB PCB Schematic Diagram 4 17 ...
Page 146: ...4 18 4 2 2 MB PCB Parts Location ...
Page 148: ...4 3 Peripheral PCB 4 3 1 Peripheral PCB Schematic Diagram 4 20 ...
Page 149: ...4 21 4 3 2 Peripheral PCB Parts Location ...
Page 152: ...5 2 Main PCB 75 Peripherals ...
Page 153: ...5 3 Power Supply Peripherals ...
Page 154: ...5 4 Customer Display Peripherals ...
Page 155: ...5 5 LCD Peripherals ...
Page 156: ...5 6 Inverter PCB Peripherals ...
Page 161: ...Printed in Japan ...