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TRC-70
16
¢
Terminal functions
1) CXD10950 : Control unit 1C300
CIRCUIT DESCRIPTION
Portname | Pin No.
Name
| 1/0
Function/operation
PAO
54
MU
O | AF mute.
During memory input.
PAI
55
Sas
O | Squelch contro!.
When squelch is closed.
PA2
56
HRL
O | HS relay control. When the speaker is switched to the external speaker.
PA3
59
TTO
O | Through instruction.
When through operation is instructed to AT.
PA4
60
DM2
O | Dimmer control.
See page 16.
PA5
61
DM1
e)
PA6
62
DMO
e)
PA7
63
O | Unused.
PBO
64
PTT
| | MIC PTT. When PTT SW is on.
PB1
3
| | Unused.
PB2
4
|
Unused.
PB3
5
KO
| | Key scan output. When SW is pressed.
PB4
6
Ki
I
PB5
7
K2
I
PB6
8
K3
{
PB7
9
K4
|
PCO
11
SO
O | Key scan output. When the key scan strobe pulse output.
PC1
12
$1
fe)
PC2
13
$2
0
PC3
14
$3
e)
PC4
15
$4
16)
PC5
16
$5
e)
PCE
17
sé
ie)
PC7
18
S7
e)
PDO
20
O | Tone D/A. When tone is output.
PD1
21
(@)
PD2
22
16)
PD3
23
fe)
PD4
24
O
PDS
27
(e)
PD6
28
ie)
PD7
29
ie)
PEO
49
DS
O | Serial data.
PE1
50
cS
O | Serial CK.
PE2
52
ES2
O | Enable.
PE3
53
ES1
oO
Vss
10
GND.
Vss
25
GND.
VDD
26
Power input pin.
DO
30
Bus pin.
D1
31
Bus pin.
D2
32
Bus pin.
D3
35
Bus pin.
D4
36
Bus pin.
D5
37
Bus pin.
D6
38
Bus pin.
D7
39
Bus pin.
CLR
40
Unused.
Fixed to H for data write.
ODEON
4)
Unused.
Fixed to H for data write.
Vss
42
GND.
WR
43
Strobe input for data write.
RD
44
Strobe input for data read.
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