Icom IC-2200H Service Manual page 16

4-8-2 CPU (IC2)
Pin Port
number name
Input port for the reset signal from the
7 RES reset IC (IC203, pin 1).
Low :The CPU is reset.
10 OSC2 Outputs 9.8304 MHz reference signal.
Input port for 9.8304 MHz reference
11 OSC1
signal.
Outputs 3.2V regulator circuit (IC2,
16 APWR
pin 3) control signal.
Outputs receive AF mute control signal
to the connected transceiver via the
29 RMUTE_C
J301 (pin 24).
High :While muting.
Outputs PTT signal to the connected
31 PTTOUT_C transceiver via the J301 (pin 2).
High :While transmitting.
Outputs transmit data signal to the
33 ATXD
CPU (IC151, pin 32).
Outputs clock signal to the CPU
34 ACLK
(IC151, pins 28 and 34).
Outputs strobe signal to the CPU
36 ASTB
(IC151, pins 30 and 38).
Input port for receive data signal from
37 ARXD
the CPU (IC151, pin 42).
Outputs reset signal to the linear
38 ARES
CODEC IC (IC50, pin 13).
Output power save control signal to
58 the +3V controller circuit (Q400 and
PSAVE
59 Q401).
Low :Power save is ON.
Input port for the BUSY signal from the
connected transceiver via the J301
61 BUSY
(pin 6).
High :While receiving signals.
Input port for the PTT signal from the
connected transceiver via the J301
62 PTTIN
(pin 1).
High :While transmitting.
Description
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