2-13
Seiko Epson Corporation
S1C31D50 TECHNICAL MANUAL
(Rev. 1.00)
When the oscillation startup control circuit in the OSC1 oscillator circuit is enabled by setting the
CLGOSC1.OS- C1BUP bit to 1, it uses the high-gain oscillation inverter for a set period of time (startup
boosting operation) after the oscillator circuit is enabled (by setting the CLGOSC.OSC1EN bit to 1) to
reduce oscillation start time. Note, however, that the oscillation operation may become unstable if
there is a large gain differential between normal operation and startup boosting operation.
Furthermore, the oscillation start time being actually reduced depends on the characteristics of the
resonator used. Figure 2.3.4.2 shows an operation example when the oscillation start-up control circuit
is used.
(1)
CLGOSC1.OSC1BUP bit = 0 (startup boosting operation disabled)
(2)
CLGOSC1.OSC1BUP bit = 1 (startup boosting operation enabled)
Figure 2.3.4.2 Operation Example when the Oscillation Startup Control Circuit is Used
Oscillator circuit enable
(CLGOSC.OSC1EN)
Oscillation inverter
INV1N[1:0] setting gain
Oscillation waveform
Normal operation
Oscillator circuit enable
(CLGOSC.OSC1EN)
Oscillation inverter
INV1N[1:0] setting gain
Oscillation waveform
Normal operation
INV1B[1:0] setting gain
Startup boosting
operation
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 ...