Kenwood TK-250 Service Manual page 25

• Pin function
SEMICONDUCTOR DATA
TK-250
Pin No.
Pin Name
Port Name
110 Function
P06 EN1
0
D/Aconverter enable output.
P07
KEY
0
'TIR (Transmit Active "Low").
P10 DKEY1
110
Key Pad Row-1 .
P11
DKEY2
110
Key Pad Row-2.
P12
DKEY3
110
Key Pad Row-3.
P13
DKEY4
110
Key Pad Row-4.
P14
DKEY5 I
Key Pad Column-4/DTMF Decode data-O.
P15 DKEY6 I
Key Pad Column-3/DTMF Decode data-1 .
P16
DKEY7
I
Key Pad Column-2/DTMF Decode data-2.
P17
DKEY8
I
Key Pad Column-1/DTMF Decode data-3.
P20 NMI I
GND.P21/1NTO DRXD I
For display serial (RX) data input.
P22/1NT1 HSDIN I
High speed decode deta input.
P23/1NT2
DFDV
I
DTMF decode detect input.
P24
TEST
110 Data output with programming.
P25/PTT PTT I
PTT/program RXD.
P26/D.TXD D TXD
0
For display serial (TX) data output.
P27 I
GND.RFSH SHIFT
0
System clock shift contral output.
P30 SOL
I
Noise pulse input.
P31
MON
I
MONI switch input.
P32
UL
1
PLL unlock detect input.
P33 LAMP
I
LAMP switch input.
X1
-
12.000MHz (system clock).
X2
-
12.000MHz (system clock).
Vss
-
GND. ANO
LSDIN I
Low speed data input.
AN1 I
Open (not used).
AN2
BATT I
BATT check input.
-
AN3
SELF
I
SELF programming prat eet input.
AVREF
-
+5V. AVss
-
GND. P34
OT/DOT
0
Low speed data (signalling) output.
P35
0
Open (not used).
P36 DATA2
110
Serial E2PROM data output I input I Tone generater data output.
P37 WRPRO
0
Parallel E2PROM write proteet output.
A8-A15
-
A8-A15 address bus.
EA
-
Extemal access.
RESET
-
Power on reset.
RD
-
Read [bus].
WR
-
Write [bus].
ALE
-
Address lateh.
ADO -AD7
-
ADO-AD7 address/data bus.
VOD
-
GND. POO
PEN
0
PLL enable output.
P01 SCL
0
Serial clock output.
P02 DATA1
0
PLL data output / Shift register data output / D/Aconverter data output.
P03 STB
0
Shift register strobe output.
P04
CT (DO)
0
Voice scrambler data output.
P05
DATA (D1)
0
Voice scrambler data output.
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