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APPENDIX B POWER SAVING
OSC3 (crystal/ceramic) oscillator circuit configurations
The OSC3 (crystal/ceramic) oscillator circuit provides some configuration items to support various crystal and
ceramic resonators. These configurations trade off current consumption for performance as shown below.
• The lower oscillation inverter gain setting (CLGOSC3.OSC3INV[1:0] bits) decreases current consumption.
• Using lower OSC3 external gate and drain capacitances decreases current consumption.
• Using a resonator with lower C
However, these configurations may reduce the oscillation margin and increase the frequency error, therefore, be
sure to perform matching evaluation using the actual printed circuit board.
B.2 Other Power Saving Methods
Supply voltage detector configuration
Continuous operation mode (SVD3CTL.SVDMD[1:0] bits = 0x0) always detects the power supply voltage,
therefore, it increases current consumption. Set the supply voltage detector to intermittent operation mode or
turn it on only when required.
AP-B-2
value decreases current consumption.
L
Seiko Epson Corporation
S1C31D50/D51 TECHNICAL MANUAL
(Rev. 2.00)
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