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"
(]1
()
o
.
171 OSCOUT
IS'
ALARM
Fig.13-2
RPSCOl
.
pin configuration
°The RPSCOI generates clock pulse internally by connecting th
e
32.768KHz
ceramic oscillator and the CR network between OSCIN and OSCOUT, and
divides it for the counter operation.
°The CS pin detects a power down, and then sets the circuit to
the power down condition.
When power is on to the personal computer, Tri
and Tt2 in Fig.2-l3-1 are active so that +SV is supplied to the RPSCOi and
the backup battery is being recharged.
When power is off, it makes Tri
gone inactive
f~rst,
then Tr2.
This isolates the circuit on the right of
Tr2.
Then the backup battery supplies power to the RP5COI, whi
c
h
ke
e
ps
th
p
.
time along with the internal RAH.
d
'i9
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