Samsung VP-L900 Training Manual page 96

Circuit Operating Descriptions
(4) Oscillation frequency regulation of Clock IC
1. Oscillation frequency regulation
2. Calculation of regulation value
%Oscillation frequency: INTRB(32KOUT)Measure value,
Standard frequency:CLOCK Standard frequency of micom
regulation value =
(Oscillation frequency - Standard frequency) 5 10 +1
* example
(1) Oscillation frequency = 32.77076KHz ; Standard frequency = 32.76805KHz
regulation value = (32770.76 - 32768.05) 5 10+1 = 28.1
(2) Oscillation frequency = 32.76395KHz ; Standard frequency = 32.76805KHz
regulation value = (32763.95 - 32768.05) 5 10+1 = -41.015
* The clock frequency output from of the INTRB(32KHz) pin does not change to after the regulation due to
clock regulation circuit.
Samsung Electronics
RS5C372A
VDD
OSCIN
INTRB (32KOUT)
VSS
(Oscillation frequency - Standard frequency + 0.1)
Oscillation frequency 5 3.051 5 10
32.768KHz
Fig. 6-15
-6
28(1C:Hex)
-41
Frequency
counter
6-17