Kenwood TK-285 Service Manual page 12

CIRCUIT DESCRIPTION / SEMICONDUCTOR DATA
9. Optional Board Terminal
Terminals for mounting the option board are provided at
the bottom edge of the TX-RX unit. The table below shows the
correspondence between the board and terminals. R37, R69,
R249, R258, R259, R304, R305 may have to be removed
depending on the type of option board being used.
Name
SB Battery (7.5V)
GND Ground
TXD Serial data
RXD Serial data
SQ Busy: high
LOK Link acquired : low (TX mode)
DI/ANI Modulation (ANI) input
DEO Detect output
TXAI/MUTE Modulation output from board or mic mute: low
TXAO Modulation input to board
RXAI Received signal input to board
RXAO Received signal output from board
D1 Binary 1
D2 Binary 2
OPT Scramble, Emergency:low
PTTIN PTT switch signal input to board (TX:low)
5CNS Battery (5V)
DI9 9600 bps data input
RXEMAO Received signal output from board (after de-
emphasis)
RXEMAI Received signal input to board (after de-
emphasis)
PTTOUT PTT switch signal output from board (TX:low)
MONI Busy:low
LAMP Busy:low
AAC Audio Amp Control signal output from board
(Busy:high)
Audio Beep Beep signal output from board.
AUX TXD Serial data
AUX RXD Serial data/Option switch port.
/EXT SW
Table 1 Terminal name and function
Function
SEMICONDUCTOR DATA
Microprocesser : 30620M8-394GP
(TX-RX UNIT : IC19)
Pin function
Pin Port
I/O
No. Name
1 LSDOUT O Low speed data output.
2 HSDOUT O High speed data output.
3 HSDIN I High speed data input.
4 DTMSTD I DTMF decode IC data detect input.
5 SELF I Self programming mode input.
6 BYTE I +5V.
7 CNVSS I GND.
8 SFTOE O Shift register output enable.
9 LCDCS O LCD driver chip select output.
10 RESET I Microcomputer reset input.
11 XOUT - 9.8304MHz (System clock).
12 VSS - GND.
13 XIN - 9.8304MHz (System clock).
14 VCC - +5V
15 AUX I AUX switch input.
16 AFTRD I FFSK modulation data output timing pulse
input.
17 AFRTM I FFSK demodulation data input timing pulse
input.
18 EN2 I Encoder pulse input 2.
19 PLLCLK O PLL IC clock output.
20 BEEP O Beep data output.
21 AFRDT I FFSK demodulation data input.
22 AFREG1 O AF IC register switching data output 1.
23 AFREG2 O AF IC register switching data output 2.
24 EEPDAT O EEPROM data output.
25 DACSTB O D/A converter IC data strobe output.
26 AFCLR O FFSK flame reset output.
27 SAVE O Battery save output.
28 LAMP I LAMP switch input.
29 AUXTXD O External Serial interface output.
30 AUXRXD I External Serial interface input.
31 PLLUL I PLL unlock detect input.
32 AFFFSKE O FFSK modulation enable (Enable active "H").
33 TXD O Serial interface output (ex. PC).
34 RXD I Serial interface input (ex. PC).
35 AFDAT O FFSK data output.
36 PTT I PTT switch input.
37 RDY - Not used.
38 ALE - Not used.
39 HOLD - Not used.
40 HLDA - Not used.
41 BLCK - Not used.
42 RD - Flash memory RD bus.
43 BHE - Not used.
44 WR - Flash memory WR bus.
45 DTMCLK O DTMF decode IC clock output.
46 CNTCLK O Common clock output.
47 PLLSTB O PLL IC data strobe output.
48 CS0 O Flash memory chip enable.
TK-285/(N)
Function
11