Cpu Port Allocation - Icom IC-PCR1500 Service Manual

4-5 CPU PORT ALLOCATION

4-5-1 CPU (LOGIC UNIT; IC18)
Pin PORT
No. NAME
Outputs strobe signal to the expander (MAIN-B
4 BMST2
UNIT; IC18, pin1).
Outputs clock signal to the expander (MAIN-B
5 BCK
UNIT; IC17, pin 3).
Outputs strobe signal to the expander (MAIN-B
8 BMST1
UNIT; IC3, pin1).
Outputs clock frequency shift signal to the
9 CSHIFT
clock shift circuit (D6).
Input port for "NOIS" signal from the IF IC
16 NOIS
(MAIN-A UNIT; IC24, pin 13).
Input port for "BNOISE" signal from the IF IC
17 BNOIS
(MAIN-B UNIT; IC24, pin 13).
Input port for power witch (CHASSIS; S1).
18 PWRSW
"Low"=While the power switch is turned.
Outputs strobe signal to the expander (MAIN-B
19 BMST3*
UNIT; IC17, pin 1).
Outputs optional unit select signal to the
20 CCS attached optional unit via the pin 20 of J2018.
"High"=While the optional unit is attached.
Outputs PLL strobe signla to the 1st PLL IC
21 BP1STB*
(MAIN-B UNIT; IC10, pin 11).
Outputs PLL strobe signla to the 2nd PLL IC
22 BP2STB*
(MAIN-B UNIT; IC13, pin 13).
Outputs strobe signal to the D/A converter
23 BDSTB*
(MAIN-B; IC8, pin 6).
27 PDIN Input port for USB data.
28 PDOUT Outputs USB data.
31 SCL Outputs clock signal to the EEPROM (IC14, pin 5).
Output serial data to the attached optional unit
33 OPSO
via the pin 18 of J2018.
Input port for serial data from the attached
34 OPSI
optional unit via the pin17 of J2018.
Outputs clock signal to the Attached optional
35 OPSCK
unit via the pin 16 of J2018.
Input port for data request signal from the
36 AIRQ
attached UT-122 via the pin 19 of the J2017.
Outputs strobe signal to the attached UT-122
37 ASTB
via the pin 20 of the J2017.
Input port for serial data from the attached
38 ASI
UT-122 via the pin 17 of the J2017.
Outputs serial data to the attached UT-122 via
39 ASO
the pin 18 of the J2017.
Outputs clock signal to the attached UT-122 via
40 ACK
the pin 16 of the J2017.
Outputs DSP select signal to the attached DSP
41 DSPS
unit via pin 7 of J15.
Outputs DSP strobe signal to the attached
42 IMST
DSP unit via pin 3 of J15.
Outputs busy signal to the attached optional
43 BUSY
unit via pin 7 of J7.
44 SDL I/O port for EEPROM (IC14, pin 6).
Outputs control signal to the AF switch (IC23,
45 OPAFSEL pin 5).
"High"=While the optional unit is activated.
Outputs control signal to the AF switch (IC23,
pin 2).
46 OPAFINH
"High"=The AF line for the optional unit is dis-
connected.
Outputs control signal to the AF switch
47 BOPAFSEL* (IC2031, pin 5).
"High"=While the optional unit is activated.
Outputs control signal to the AF switch
(IC2031, pin 2).
48 BOPAFINH*
"High"=The AF line for the optional unit is dis-
connected.
DESCRIPTION
Pin PORT
No. NAME
Input port for mute signal from the attached
49 RXMUTE optional unit via the pin 24 of J2018.
"High"=While the audio output is muted.
Outputs control signal to the AF switch (IC4,
53 APAFSEL pin 5).
"High"=While the UT-122 is in use.
Outputs control signal to the AF switch (IC4, pin
54 APAFINH 2).
"High"=While the attached UT-122 is inactivated.
Outputs serial data to the electric volume
57 VDAT
(IC17, pin 16).
Outputs clock signal to the electric volume
58 VCK
(IC17, pin 15).
Outputs strobe signal to the electric volume
59 VSTB
(IC17, pin 14).
Outputs strobe signal to the expander (IC34,
61 LSTB
pin 1).
Outputs control signal to the power controller
64 PWR (Q4, Q6).
"High"=While the receivers power is ON.
Input port for detecting signal from the DTMF
65 DTMSTD decoder (IC19, pin 14).
"High"=When the DTMF signal is detected.
Input port for DTMF signal from the DTMF
66 DTMSD
decoder (IC19, pin 9).
Outputs clock signal from the DTMF decoder
67 DTMCK
(IC19, pin 11).
Outputs strobe signal to the DDS IC (MAIN-A
70 PDSTB
UNIT; IC22, pin 41).
Input port for USB connection detecting signal
from the VBUS line.
73 VBUS
"High"=While a PC is connected through [USB] con-
Outputs strobe signal to the D/A converter
75 DSTB
(MAIN-A; IC8, pin 6).
Outputs strobe signal to the 2nd PLL IC
76 P2STB
(MAIN-A UNIT; IC13, pin 13).
Outputs strobe signal to the 1st PLL IC
77 P1STB
(MAIN-A UNIT; IC12, pin 11).
Outputs strobe signal to the down converter
78 DPSTB
PLL IC (MAIN-A UNIT; IC4, pin 11).
Outputs strobe signal to the expander (MAIN-A;
79 MST0
IC3, pin 1).
Outputs strobe signal to the expander (MAIN-A;
80 MST1
IC18, pin 1).
Outputs strobe signal to the expander (MAIN-A;
81 MST2
IC3, pin 1).
Input port for RSSI signal from the RSSI signal
82 BCMAD*
selector (MAIN-A; IC30, pin 1).
Input port for VSC signal from the tone filter
83 BVSCAF*
(IC2021, pin 7).
Input port for CTCSS signals from the tone
85 BRTONE*
fi lter (MAIN-B UNIT; IC21, pin 1).
Inputpor t for RSSI signal from the IF IC
86 BSMAD*
(MAIN-A/B UNITS; IC16, pin 13).
88 TEMP Input port for internal temperature detection.
Input port for RSSI signal from the IF IC (MAIN-A/
89 SCAD
B UNITS; IC20, pin 5) for band scope function.
Input por t for RSSI signal from the IF IC
90 CMAD
(MAIN-A UNIT; IC30, pin 1) for AFC function.
Input port for VSC signal from the tone filter
91 VSCAF
(IC21, pin 1).
Input port for CTCSS signals from the tone
93 RTONE
fi lter (MAIN-A UNIT; IC21, pin 7).
Outputs voltage line control signal to the 3.3V
98 USBPOW regulator (IC1, Q31, Q32, Q33).
"High"=During in the USB audio mode.
4 - 7
DESCRIPTION
nector on the receiver's main unit.
*PCR2500 only