Radio Shack HTX-400 Service Manual page 17

No. PIN NAME
1 VSS
2 XOUT
3 XIN
4 RESET
5 P22(XTOUT)
6 P21(XTIN)
7 TEST
8 P20(INT5/STOP)
9 P40(INT3/TC3)
10 P41(PWM/PDO)
11 P42(SCK1)
12 P43(SI1)
13 P44(SO1)
14 P45(SCK2)
15 P46(SI2)
16 P47(SO2)
17 P10(INT0)
18 P11(INT1)
19 P12(INT2/TC1)
20 P13(DVO)
21 P14(PPG)
22 P15(TC2)
23 P16
24 P17
25 P30
26 P31
27 P32
28 P33
29 P34
30 P50(AIN0)
31 P51(AIN1)
32 P52(AIN2)
33 P53(AIN3)
34 P54(AIN4)
35 P55(AIN5)
36 P56(AIN6)
37 P57(AIN7)
REMARKS
GROUND
HIGH FREQUENCY CLOCK OUT
HIGH FREQUENCY CLOCK IN
RESET input
OPEN DRAIN N.C
OPEN DRAIN CTCSS DEFAULT OPTION
Fixed to Low(GROUND)
OPEN DRAIN BUSY input
TRI STATE PLL(LV2105) CLOCK
TRI STATE ALERT TONE (PDO mode output) (OUT)
TRI STATE PLL(LV2105) DATA
TRI STATE PLL(LV2105) CE(CHIP ENABLE) (OUT)
TRI STATE ALIGNMENT MODE CONTROL
TRI STATE FX465 Serial Clock
TRI STATE FX465 Serial Data
TRI STATE FX465 Load Latch
TRI STATE FX465 RX Tone Decode
TRI STATE TX Enable 1
TRI STATE TX Enable 2
TRI STATE EEPROM SERIAL DATA
TRI STATE EEPROM SERIAL CLOCK
TRI STATE RX ENABLE
TRI STATE LAMP CONTROL
TRI STATE AUDIO MUTE
OPEN DRAIN KEY IN 1
OPEN DRAIN KEY IN 2
OPEN DRAIN KEY IN 4
OPEN DRAIN KEY IN 8
OPEN DRAIN *Reserved
TRI STATE SIGNAL LEVEL (A/D)
TRI STATE BATTERY LEVEL (A/D)
TRI STATE KEY OUTPUT 1
TRI STATE KEY OUTPUT 2
TRI STATE PLL LOCK DETECTOR
TRI STATE MONITOR KEY
TRI STATE FUNCTION KEY
TRI STATE MODEL SELECTOR
16
DESCRIPTION
(IN)
(OUT)
(OUT)
(OUT)
(OUT)
(OUT)
(IN)
(OUT)
(OUT)
(IN/OUT)
(OUT)
(OUT)
(OUT)
(OUT)
(IN)
(IN)
(IN)
(IN)
(IN)
(IN)
(IN)
(OUT)
(OUT)
(IN)
(IN)
(IN)
(OUT)
ACTIVE
LOW:CTSS
High:Busy
ACTIVE "H"
High pulse
OK:"L"
ENABLE:"L"
ENABLE:"L"
ENBALE:"L"
ON : "H"
MUTE : "H"
ACTIVE:"H"
ACTIVE:"H"
ACTIVE:"H"
ACTIVE:"H"
A/D
A/D
ACTIVE:"H"
ACTIVE:"H"
LOCK:"H"
PUSH:"L"
PUSH:"L"