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CIRCUIT DESCRIPTION
TRC-70
CS
45
Chip select input.
Vop
58
Power input pin.
2) uPD78C10AG-36 : Control unit IC302
Port name | Pin No.
Name
0
Function/Operation
PCO
17
DL
O | Serial data for LCD.
PC1
18
EN2
| | Encoder CK2.
PC2
19
CL
O | Serial CK for LCD.
PC3
20
EN1
{ | Encoder CK1.
PC4
21
EL
O | LCD enable.
PCS
22
KEY
| | Key. When marked.
PC6
23
BZ
O | Buzzer.
PC7
24
NB2
O | NB switching. When NB2 operates.
PDO
55
DO
YO | Bus.
PD1
56
D1
VO | Bus.
PD2
57
D2
/O | Bus.
PD3
58
D3
/O | Bus.
PD4
59
D4
YO}
Bus.
PDS
60
D5
VO | Bus.
PD6
61
D6
(0 | Bus.
PD7
62
D7
1/0 | Bus.
PFO
47
A8
O | Address.
PF1
48
AQ
O | Address.
PF2
49
A10
O | Address.
PF3
50
Alt
O | Address.
PF4
51
Al2
O | Address.
PF5
52
Al3
O | Address.
PF6
53
Ai4
O | Address.
PF7
54
A158
O | Address.
MNI
25
l
Unused.
INT1
26
EN1
| | Encoder CK1.
ANO
34
CL2
| | Clarifier.
AN1
35
M
|
Level meter.
AN2
36
PLSB
| | LSB correction.
AN3
37
PUSB
{ | USB correction.
AN4
38
DLY
| | Delay VR.
AN5
39
|
Unused.
AN6
40
UP
| | MIC UP, When SW is on.
AN7
Aj
DW
| | MIC DOWN.
When SW is on.
PAO
1
STT
O | TX 8T switching.
In TX mode.
PA1
2
BLK
O | RF mute. When PLL is switched.
PA2
3
VSQ
| | Audio squelch.
When an audio signal is present.
PA3
4
NB1
O | NB switching. When NB1 and NB2 operate.
PA4
5
TSO
O | AT tune start.
PA5
6
TTI
| | AT tune end.
PAS
7
V2
O | VCO switching.
PA?
8
V1
0)
PBO
9
EP2
O j PLLIC enable.
PBI
10
EP3
fe)
PB2
11
EP1
ie)
17
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