– 53 –
5-15.
IC PIN FUNCTION DESCRIPTION
•
BASE MAIN BOARD IC8 MB89174APF-G-288-BND (SYSTEM CONTROLLER)
Pin No.
Pin Name
I/O
Description
1
DTMF
O
DTMF tone signal output terminal
2
RESET
I
System reset signal input from the reset signal generator (Q18) “L”: reset
For several hundreds msec. after the power supply rises, “L” is input, then it changes to “H”
3, 4
MOD0, MOD1
I
Setting terminal for the CPU operational mode Fixed at “L” in this set
5
X0
I
Main system clock input terminal (3.583 MHz)
6
X1
O
Main system clock output terminal (3.583 MHz)
7
VCC
—
Power supply terminal (+5V)
8
X0A
I
Sub system clock input terminal Not used (fixed at “L”)
9
X1A
O
Sub system clock output terminal Not used (open)
10
PLL EN
O
Chip enable signal output to the M64884FP (IC302)
When PLL EN goes from “L” to “H”, it load data from PLL DATA
11
PLL DATA
O
PLL serial data output to the M64884FP (IC302)
12
PLL CLK
O
PLL serial data transfer clock signal output to the M64884FP (IC302)
13
CHG OUT
O
Charge on/off control signal output terminal “H”: charge on
14
CHG CNT
O
Charge on/off circuit control signal output terminal
15
RX MUTE
O
Muting control signal output to the IR3N74AN (IC1) “L”: muting on
At RX mode: After receiving premble bits from handset muting it until data sent finished
16
TX MUTE
O
Muting control signal output to the IR3N74AN (IC1) “L”: muting on
At TX mode: During sending data to handset, muting it
17
MIC MUTE
O
Microphone amplifier on/off control signal output terminal “L”: muting on
18
PWR OFF
I
Battery level detect signal input from the RH5VL43CA (IC7) “L”: battery off
19
GND
—
Ground terminal
20
PARAENB
I
Establish telephone detect signal input terminal “L”: off hook
21
BELL IN
I
Detect signal input of the ringer coming “L”: ringer coming
22
TONE/PULSE
I
DIAL MODE switch (S1) input terminal “L”: tone mode, “H”: pulse mode
23
TAD ACT
I
Operation status signal input form the DSP (IC202)
24
CHG IN
I
Charge detection signal input terminal “L”: charge on
25
SP MUTE
O
Speaker muting control signal output to the speaker amplifier(IC201) “H”: muting on
26
RLCONT
O
Relay drive signal output terminal “H”: hook on
27 to 29
ENB1 to ENB3
O
Telephone mode signal output to the DSP (IC202) *1
30
TBUSY
I
Busy signal input from the DSP (IC202) “H”: in the midst dialing
31
THOOK
I
Status signal input from the DSP (IC202) “L”: in the midst automatic response or line remote
32
SP LED
O
LED drive signal output of the SPEAKERPHONE indicator (D211) “L”: LED on
33
KEY IN1
I
Key on signal input of INTERCOM key (S207) is pressed from the DSP (IC202) “H”: key on
34
KEY IN2
I
Key on signal input of SPEAKERPHONE key (S232) is pressed from the DSP (IC202)
“H”: key on
35
BELL LOW
I
RINGER switch (S2) input terminal “L”: volume level is low
36
BELL HI
I
RINGER switch (S2) input terminal “L”: volume level is high
37
TX CNT
O
TX system power supply on/off control signal output “L”: TX system power on
38
BELL OUT
O
Bell output terminal to the speaker amplifier (IC201)
39
SQ IN
I
Squelch signal (carrier detection signal) input from the MC3361CDR2 (IC3)
“L”: carrier present, “H”: no carrier
40
DATA IN
I
Receive data input terminal
41
DATA OUT
O
Transmit data output terminal
42
INUSE LED
O
LED drive signal output of the IN USE indicator (D212) “L”: LED on
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