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1-1.
CIRCUIT
DESCRIPTION
SECTION
1
OUTLINE
Pin Functions of IC6 (uPD7508HG)
Pin 3, 4, 28, 30, and 35 are not used on this set.
IN/OUT
|_XT-10
XT-10 |
Description
Jumper switch input. pin for setting the
| desired destination.
These switches are set as shown below.
Jswi
ISW2
Destination
E (including LW)
Select switch input pin of LW1 — LW4 when
JSW1 and JSW2 are in "L'"'.
These switches are not used in this model.
LOCAL/DX
SIGNAL OUTPUT
PIN
| Outputs ''H" for LOCAL and "L" for DX.
FM
MONO/STEREO
AGC CUT SIGNAL OUTPUT
PIN
MUTING
SIGNAL OUTPUT
PIN
FM MONO/STEREO
SELECT
SIGNAL
OUTPUT
PIN
Outputs '"'L" normally and ''H" during AUTO
SCAN.
Outputs ''H'"' when frequency or band changes.
Outputs "H"' at MONO, and "'L" at STEREO.
Effective for only FM.
STEREO
NC
(non connection) L
STEREO
SIGNAL
INPUT PIN
Inputs ''H" during STEREO.
Effective for only FM.
not used
NC
(non connection)
not used
ACC CHECK
ACC POWER
INPUT
PIN
Operation mode at ACC "H"'.
HALT mode at "L"'.
DISP SELECT
DISPLAY
SELECT
SIGNAL
INPUT PIN
Outputs display data to display microcomputer
when display select signal rises.
RESET
INPUT
PIN
High active.
RESET
=|
CLI
CRYSTAL
OSCILLATOR
PIN
4.19 MHz crystal oscillator pin.
VpD
POWER
SUPPLY
(+5V)
CL2
CRYSTAL
OSCILLATOR
PIN
4.19 MHz crystal oscillator pin.
DISP SELECT
DISPLAY
SELECT
SIGNAL
INPUT PIN
Outputs display data to display microcomputer
when display select signal reises.
Connected to GND.
SCK
ale
SERIAL
CLOCK
INPUT PIN
Serial clock input pin from display micro-
computer.
NC
(non connection)
not used
SI
SERIAL
DATA
INPUT PIN
Connected to GND.
Serial data (32 bit) input pin from display
microcomputer.
POWER
SIGNAL
OUTPUT
PIN
"xT a=
POWER ON/OFF OUTPUT PIN OF PLL IC
(CX7925).
Outputs "H" at power on, "'L"' at power off.
IN/OUT
Name
Description
OUT
FM OUTPUT
PIN
Output pin for FM band.
Outputs ""H" for FM band. Otherwise, outputs
"yp.
+
AM OUTPUT
PIN
Output pin for AM band.
Outputs "H" for AM band (except for LW).
Otherwise, outputs '"'L".
LW OUTPUT
PIN
Output pin for LW band.
Outputs ''H"' for LW band.
Otherwise, outputs
"pb".
Not used on this set.
JUMPER
SWITCH
5 INPUT PIN
Reference 10 kHz/9 kHz select switch for AM
band.
Becomes 9 kHz for '"'L'' level input and
10 kHz for "'H" level input.
AM
STEREO
STEREO
INPUT PIN FOR
AM
AM band (except for LW), stereo mode:
Inputs ''H" for stereo tuned.
Otherwise, in-
puts "L".
However, only when inputting "L" at JSW6
input pin.
Not used on this set.
UNLOCK
NC
(non connection)
AM
MONO/STEREO
COMPULSORY
MONO
SELECT
SWITCH
INPUT
PIN
UNLOCK
INPUT PIN
AM MONO/STEREO
SELECT
SIGNAL
OUTPUT
PIN
Compulsory mono select switch for FM or
FM/AM (except for LW).
'"*H": FM is compelled to mono.
"LL": FM and AM (except for LW) are com-
pelled to mono.
Input pin which distinguishes whether PLL IC
(CX7925) is in LOCK mode or in UNLOCK
mode.
Inputs '""H" in UNLOCK mode and ''L"'
in LOCK mode.
not used
Stereo mode output pin for AM band.
Outputs ''H" at MONO and "L" at STEREO.
However, only when inputting '""L" at JSW6
input pin.
NC
(non connection)
not used
LATCH
[LAToH SIGNAL
OUTPUT
PIN AFTER
TRANSMITTING
SERIAL
DATA
TO
PLL IC. ACTIVE
"H"
After transmitting data of standard frequency
and programable divider, outputs LATCH.
Active "H".
Vss
GND
Connected to GND.
NC
(non connection)
not used
PLL DATA
PLL DATA
OUTPUT
PIN
Serial data output pin to PLL IC (CX7925).
PLL CLK
PLL CLOCK
OUTPUT
PIN
Clock output pin to PLL IC (CX7925).
Outputs active ""H". (Clock for transmitting
serial data.)
SERIAL
DATA
OUTPUT
PIN
Serial data output pin to DISP microcomputer.
(For transmitting serial.)
Frame OUTPUT
PIN WHEN
TRANSMITTING
DATA
Clock output pin when transmitting data to
DISP microcomputer.
Outputs CLOCK when
transmitting data. Active ''L''.
NC
(non connection)
axKT a=
not used
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