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EPSON
S1C63656 TECHNICAL MANUAL
CHAPTER 4: PERIPHERAL CIRCUITS AND OPERATION (Oscillation Circuit)
4.3.7 Programming notes
(1) It takes at least 5 msec from the time the OSC3 oscillation circuit goes on until the oscillation stabi-
lizes. Consequently, when switching the CPU operation clock from OSC1 to OSC3, do this after a
minimum of 5 msec have elapsed since the OSC3 oscillation went on.
Further, the oscillation stabilization time varies depending on the external oscillator characteristics
and conditions of use, so allow ample margin when setting the wait time.
(2) When switching the clock form OSC3 to OSC1, use a separate instruction for switching the OSC3
oscillation off. An error in the CPU operation can result if this processing is performed at the same
time by the one instruction.
(3) When selecting OSC3 for the time base counter clock of the R/f converter, the maximum frequency of
the OSC3 clock is limited to 2 MHz.
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