Power Supply Circuits; Port Allocations - Icom IC-UR8050 Service Manual

2-4 POWER SUPPLY CIRCUIT
2-4-1 VOLTAGE LINES
LINE
The voltage from the connected DC power sup-
ply. The output voltage is applied to the CPU
13.8 V
(LOGIC unit; IC1, pin 45) via the V.DET circuit
(LOGIC unit; IC21, pin 3 and 5).
The same voltage as the 13.8 V line which is
controlled by the power switch (FRONT unit; S1).
S13.8 V
The output voltage is applied to the AF amplifier
(LOGIC unit; IC15, pin 5) via the "V13" line.
Common 9 V converted from the DC power sup-
ply by the + 9 V regulator circuit (REG unit; IC1).
+ 9 V
The output voltage is applied to TX switch, + 5 V
regulator, ripple filter on TX unit and + 5 V regu-
lator, ripple filter on RX unit.
Common 5 V converted from the + 9 V regulator
circuit (REG unit; IC1) by the + 5 V regulator cir-
+ 5 V cuit (LOGIC unit; IC9).
The output voltage is applied to RESET circuit
(LOGIC unit).
• PLL CIRCUITS
Ref.
TX unit
LOGIC unit
Ref.
RX unit
DESCRIPTION
CHARGE
PUMP
VCO
PLL IC
N–DATA (TX)
CPU
IC5
N–DATA (RX)
PLL IC
CHARGE
PUMP
VCO

2-5 PORT ALLOCATIONS

2-5-1 CPU (LOGIC UNIT IC1)
Pin Port
number name
3 P62 / A18
4 P61 / A17
5 P60 / A16
P21 /
29
INTP0
P22 /
30
INTP1
P23 /
31
INTP2 / C1
P24 /
32
INTP3
45 P74 / AN4
46 P73 / AN3
47 P72 / AN2
48 P71 / AN1
49 P70 / AN0
54 P00
55 P01
56 P02
57 P03
58 P04
TX signal to PA unit
Buff.
Buff.
RX signal to LOGIC unit
Buff.
Buff.
2 - 4
Description
Outputs LOCAL INHIBIT LED control
signal .
Outputs COR SIMURATE LED control
singal.
Outputs RESET LED control signal.
Input port for the transmitting mode
from the outside signal.
Input port for the STB signal to switch
the outside frequency.
Input port for the LOCAL mode from
the outside signal.
Input port for the RESET signal from
the outside signal.
Input port for the VD, H signal from the
DC power supply voltage detecting
circuit.
Input port for the VD, L signal from the
DC power supply voltage detecting
circuit.
Input port for the TX unlock signal.
Input port for the RX unlock signal.
Input port for the squelch signal.
Outputs clock signal to TX and RX
PLL IC.
Outputs data signal to TX and RX PLL
IC.
Outputs LE signal to TX PLL IC.
Outputs LE signal to RX PLL IC.
Outputs control signal for transmitting.