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TRC-70
18
CIRCUIT DESCRIPTION
Portname | Pin No.
Name
0
Function/Operation
PB3
12
cP
O | Serial CK for PLL IC.
PB4
13
DP
O | Serial data for PLL IC.
PB5
14
STR
O | RX 8R switching. In RX mode.
PB6
15
O | Unused.
PB7
16
TSI
© | AT through response.
MODE 1
27
| | Specify the size of the external memory.
Fixed to H level.
RESET
28
| | Reset input. Usually H.
MODE 0
29
| | Specify the size of the external memory.
Fixed to H level.
X2
30
| | Crystal connection pin for internal clock generation.
x1
31
|
Crystal connection pin for internal clock generation.
Vss
32
1 | GND.
A Vss
33
{ | A/D converter GND pin.
VAREF
42
| | AVD converter reference voltage input pin.
A Vop
43
| | A/D converter power pin.
RD
44
O | Strobe signal output for external memory read operation.
WR
45
© | Strobe signal output for external memory write operation.
ALE
46
© | Strobe signal to externally latch the low-order address output to pins PDO to PD7 to access
the external memory.
STOP
63
{ | Control input pin in the hardware stop mode.
Vop
64
| | Go L for backup.
3) TC9174F : TX-RX unit IC9
Portname | Pin No.
Name
i/o
Function/Operation
OP1
2
B8
Q | BPF switching signal.
OP2
3
B7
(e)
OP3
4
B6
io)
OP4
5
BS
6)
OP5
6
B4
oO
OP6
7
B3
ie)
OP7
8
B2
ie)
OP8
9
Bi
's)
OPg
10
O + Unused.
OP10
11
TUNE
O | Power control at AT. During tune transmission,
4) TC9174F : TX-RX unit IC10
Portname | Pin No.
Name
/0
Function/Operation
OP1
2
O | Unused.
OP2
3
AM
O | In H3E mode.
OP3
4
CW
O | In CW mode.
OP4
5
ALS
OQ | Tone mute. When tone is output.
OP5
6
FL3
O | LPF switching signal.
OP6
7
FL2
oO
OP7
8
FLA
O
OP8
9
O | Unused.
OPS
10
M-POW | O | Power control.
OP10
11
L-POW
| O
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