2-11
Seiko Epson Corporation
S1C31D50 TECHNICAL MANUAL
(Rev. 1.00)
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 “OSC
3 oscillation auto-
trimming function” in this chapter and
“OSC
3
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
.
Figure 2.3.3.4 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” chapte
r.
Input
control
circuit
EXOSCEN
EXOSC clock
input circuit
EXOSC
EXOSCCLK
Int
er
na
l dat
a b
us
Summary of Contents for S1C31D50
Page 461: ...25 1 Seiko Epson Corporation S1C31D50 TECHNICAL MANUAL Rev 1 00 25 Package TQFP12 48PIN ...
Page 462: ...25 2 Seiko Epson Corporation S1C31D50 TECHNICAL MANUAL Rev 1 00 QFP13 64PIN ...
Page 463: ...25 3 Seiko Epson Corporation S1C31D50 TECHNICAL MANUAL Rev 1 00 TQFP14 80PIN ...
Page 464: ...25 4 Seiko Epson Corporation S1C31D50 TECHNICAL MANUAL Rev 1 00 QFP15 100PIN ...