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ST-JX44L
@ CONTROLLER
IC TCP4621BP-6504/-6505
The terminal functions are as follows:
Main Functions:
e
Key input detection
e
Fluorescent
indicator
tube
(FL401)
indication
output
¢
Data transmission
to PLL frequency synthesizer
IC (IC401: CX778A) (16 bit serial data)
1C402 Terminal Functions
FL tube... Fluorescent Indicator Tube
+B
CLOCK
Signal input for "STEREO" indication
ee
ners
aera
LATCH
©
Signal input for external remote controller
Muting control signal output
MUT.
1
(L: mute)
Signal output for FM mode switch
MUT. 0
(L: "STE REO/MUTING" on)
Signal input for "LOCKED" indication
(H: "LOCKED")
FM/AM switching signal output
(H: FM, L: AM)
CPU operation stop signal input
(H: CPU operation stop)
Signal output
for
CLOCK (1700Hz}
g
h
Microcomputer clock input (360k Hz)
Grid 5
Digit signal output
Grid 4
ee
:
ey inpu
tor FL tube grid
Grid 3
drive
Grid 2
Grid 1
Digit signal output
for FL tube grid drive
—12—
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