Advertisement
OSC1 oscillator circuit configurations
The OSC1 oscillator circuit provides some configuration items to support various crystal resonators
with ranges from cylinder type through surface-mount type. These configurations trade off current
consumption for performance as shown below.
The lower oscillation inverter gain setting (CLGOSC1.INV1B[1:0]/INV1N[1:0] bits) decreases
•
current consumption.
The lower OSC1 internal gate capacitance setting (CLGOSC1.CGI1[2:0] bits) decreases current
•
consumption.
Using lower OSC1 external gate and drain capacitances decreases current consumption.
•
Using a crystal 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.
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.
A.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.
26-2
value decreases current consumption.
L
value decreases current consumption.
L
Seiko Epson Corporation
S1C31D50 TECHNICAL MANUAL
(Rev. 1.00)
Advertisement
