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LED OUTPUT
KEYSCAN signals (P50-P57) are latched by external latch ICs(IC952,IC953 /TC74HC273),and
the port is expound then LED is used.
LED PORT
KS
0
LED
LINE1 LINE2 LINE3
LATCH1
LED
CONF DND
LATCH2
DATA "1" : turn on
"0" : turn off
OUTPUT TIMING for LED extension port
note : Do not make LED OUTPUT and KEY SCAN at same time.
1
2
3
LINE4
LOWER MUTE
4
5
INTER
NEW
COM
CALL
VISUAL
MESSAGE
WAITING
6
7
SPEKER
BUSY
PHONE
REDIAL
23
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