aPPenDiX C POWeR SaVinG
S1C63003/004/008/016 TeChniCal Manual
Seiko epson Corporation
aP-C-1
(Rev. 1.1)
Appendix C Power Saving
Current consumption will vary dramatically, depending on CPU operating mode, operation clock frequency, and the
peripheral circuits being operated. Listed below are the control methods for saving power.
Power Saving by Clock Control
C.1
Figure C.1.1 illustrates the S1C63003/004/008/016 clock system.
OSC3
oscillation circuit
OSC1
oscillation circuit
(32.768 kHz)
S1C63000 CPU
Internal logic
System clock
f
OSC1
•1/128
f
OSC1
•1/1–1/256
f
OSC3
•1/1–1/256
SLEEP
On/Off
HALT
Gate
FOUT
Clock timer
f
OSC1
•1/128
Watchdog timer
Gate
f
OSC1
or f
OSC3
Integer multiplier
*
2
Gate
f
OSC1
•1/128
Stopwatch timer
Gate
f
OSC1
, f
OSC1
•1/128
Sound generator
Gate
f
OSC1
•1/16
LCD system voltage
regulator (booster)
Gate
Gate
f
OSC1
•1/16–1/256
P0 key input interrupt
noise rejector
Gate
f
OSC1
•1/16–1/256
P1 key input interrupt
noise rejector
*
3
Gate
f
OSC1
•1/1–1/256
f
OSC3
•1/1–1/256
Programmable
timer 0
Gate
f
OSC1
•1/1–1/256
f
OSC3
•1/1–1/256
Programmable
timer 1
*
3
Gate
f
OSC1
•1/1–1/256
f
OSC3
•1/1–1/256
Programmable
timer 2
*
3
Gate
f
OSC1
•1/1–1/256
f
OSC3
•1/1–1/256
Programmable
timer 3
*
1
Gate
f
OSC1
•1/1–1/4
f
OSC3
•1/1–1/4
Serial interface
*
3
Gate
f
OSC1
•1/1–1/4
f
OSC3
•1/1–1/4
R/F converter
Gate
Oscillation circuit
Clock manager
f
OSC1
divider
f
OSC3
divider
f
OSC3
f
OSC1
*
1 S1C63016 only
*
2 S1C63008/016 only
*
3 S1C63004/008/016 only
1.1 Clock system
Figure C.