Kenwood TK-80 Service Manual page 23

TK-80
Pin No. Pin Name Port Name I/O
41 RD
42 WR
43~50 D7~D0
51 BSY
52 KEY
53 KYS
54 ODEN
55 TSI
56 TTI
57 ATI
58 THP
59 TXD
60 RXD
61 RTS
62 CTS
63 ABSL
64 FSD
65 P81
66 CTS0
67 Vcc
68 AVcc
69 Vref
70 AVss
71 Vss
72 POD1
73 POD2
74 VSRM
75 VCL
76 VSQL
77 VSFM
78 SM
79 VDLY
80 SS
I/O Port: UPD71055GB-3B4 (Control unit IC7)
Pin No. Pin Name Port Name I/O
1 NC
2 CS
3 GND
22
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SEMICONDUCTOR DATA
P21 O Expansion I/O RD signal. H: Normal, L: RD
P20 O Expansion I/O WR signal. H: Normal, L: WR
P17~P10 O False data path
P07 O Packet busy output. H: Busy, L: Normal
P06 I Key input. H: No input, L: Input
P05 I Key plug attachment decision. H: Attached, L: Not attached
P04 O Expansion I/O reset output. H: Reset, L: Normal
P03 I External AT control input
P02 I External AT control input
P01 I Internal AT attachment decision. H: Not attached, L: Attached
P00 I Power down request during temperature protection. H: Protection actuation, L: Normal
TXD1 O Uart data output
RXD1 I Uart data input
P85 O Uart reception authorization output. H: Reception not allowed, L: Reception allowed
CTS1 I Uart transmission authorization output. H: Transmission not allowed, L: Transmission allowed
TXD0 O Selective call code transmission uart data output
P83 O Local DDS, PLL register selection. H: Register B, latch V1, L: Register A, latch V2
RXD0 I Selective call uart data input
P81 I GND
CTS0 I Selective call transmission authorization input. H: Transmission not allowed, L: Transmission allowed
Vcc I Power supply
AVcc I A/D power supply
Vref I A/D reference power supply
AVss I A/D GND
Vss I GND
AN7 I Variable condenser 1 VR, A/D input
AN6 I Variable condenser 2 VR, A/D input
AN5 I Reflection wave voltage, A/D input
AN4 I Clarifier VR, A/D input
AN3 I Squelch VR, A/D input
AN2 I RF meter voltage (progression wave voltage), A/D input
AN1 I S-meter voltage, A/D input
AN0 I VOX delay VR, A/D input
P67 I Send switch input. H: No input, L: Input
NC - Not used
CS I Chip select input
GND I GND
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