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{3)
Functions of terminals
=
Pin
Pin
as
Code | Symbol
{
VSs
2
C011
Function
; Ground terminal
LW source controt output terminal, |
H teve!l output
,
MW source control output terminal,
H level output
FM source control. output terminal,
H level output
Function
Data output terminal for BCD driver
SN74LS42
Preset memory display
_LED (M1 — M8) and PHONO, AUX1
and AUX 2 source LED contro} terminal
Test terminal. Connected to ground
AC outlet output terminal, H tevel
output
Muting output terminal, H level
output
Data latch clock output terminal for
MN6147
Frequency display digit output and
switch and key matrix scan port,
The scan is low level,
COS..,G1,004...G2,C03... G3,
CO2...G4,C01...G5,Cc00..,
'GS1, GS2
Bi3
Switch and key matrix input terminal.
The input signal is always supplied
from the micro computer standard
routine.
;
;
Reset terminal.
When power is supplied
to the micro computer, the level is L.
in the norma! condition, the ijevel is
H..
:
To use the SNS? for counter mode,
connect to ground.
(For the models
| without clock, connect to ground.}
Lock detection input terminal for
; PLL system, The MN6147 ALDO
signal is applied to this termina! via
the filter. This terminal is used for
auto up/down station seek.
Lock mode — H fevel input
Unlock mode-— | level input
Reference clock {250 Hz) input
terminal. Input from MN6147 CK2.
For the models without clock, connect
Station detector signa! (tuning
detector signal) input terminal.
Checks the input only in the auto
up/down station seek.
Station detector signal — H level input
Non station detector signal — L ievel
input.
In the norma! condition, the muting
is released regardiess of the station
detector signal.
;
'
+ MN6i47 data output and display
° segment output terminal.
| The segment sean is iow.
Power supply terminal (+5V + 10%)
Bi2
detection terminal.
[n the battery
back-up mode, the output of the micro
computer becomes low and only the
clock is counted.
When the power is
recovered, the unit is set to GFF mode
(OFF key on condition} and display
indicates the current time.
| Battery back-up mode — L level input
Normal power supply — H level input
Micro computer clock (526.5 kHz)
input terminal.
Input from MN6147 CK1.
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