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Internal Oscillator Mode
The OSC3 oscillator circuit is equipped with an auto- trimming function that automatically adjusts the
frequency. This helps reduce frequency deviation due to unevenness in manufacturing quality,
temperature, and changes in voltage. For more information on the auto- trimming function and the
oscillation characteristics, refer to "OSC3 oscillation auto-trimming function" in this chapter and
"OSC3 oscillator circuit characteristics" in the "Electrical Characteristics" chapter, respectively.
EXOSC clock input
EXOSC is an external clock input circuit that supports square wave and sine wave clocks. Figure
2.3.3.4 shows the configuration of the EXOSC clock input circuit
.
EXOSC has no oscillation stabilization waiting circuit included, therefore, it must be enabled when a
stabilized clock is being supplied. For the input clock characteristics, refer to "EXOSC external clock
input characteristics" in the "Electrical Characteristics" chapter.
S1C31D50 TECHNICAL MANUAL
(Rev. 1.00)
EXOSC clock
input circuit
EXOSCEN
Input
EXOSC
control
circuit
Figure 2.3.3.4 EXOSC Clock Input Circuit
Seiko Epson Corporation
EXOSCCLK
2-11
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