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Table C.1.2 shows a list of methods for clock control and starting/stopping the CPU.
Current
OSC1
consumption
↑
Stop
Low
Oscillation
(system CLK)
Oscillation
(system CLK)
Oscillation
(system CLK)
Oscillation
High
Oscillation
↓
HALT and SLEEP mode cancelation methods (CPU startup method)
1. Startup by a port
Started up by a key input interrupt.
2. Startup by a peripheral circuit being operated with the OSC1 clock
Started up by an interrupt from the clock timer, stopwatch timer, watchdog timer or a peripheral circuit being
operated with an OSC1 dividing clock.
3. Startup by a peripheral circuit
Started up by a peripheral circuit interrupt.
C.2
Power Saving by Power Supply Control
The available power supply controls are listed below.
internal operating voltage regulator
• Note that turning on internal operating voltage regulator heavy load protection will increase current consump-
tion. Turn off heavy load protection for normal operations. Turn on only if operations are unstable.
lCD system voltage regulator
• Turning on the LCD system voltage regulator heavy load protection will increase current consumption. Turn
off heavy load protection for normal operations. Turn on only if the display is unstable.
• If no LCD display is being used, turn off the LCD system voltage regulator.
Supply voltage detection (SVD) circuit
• Operating the SVD circuit will increase current consumption. Turn off power supply voltage detection unless
it is required.
S1C63003/004/008/016 TeChniCal Manual
(Rev. 1.1)
Table C.
1.2 Clock control list
OSC3
CPU clock
Stop
Stop
Stop
Stop
Stop
Stop
Stop
Run
Oscillation
Stop
(system CLK)
Oscillation
Run
(system CLK)
[S1C63004/008/016]
Seiko epson Corporation
aPPenDiX C POWeR SaVinG
Peripheral
Peripheral
(OSC3)
(OSC1)
Stop
Stop
Stop
Run
Run
Run
Run
Run
Run
Run
Run
Run
CPU stop
CPU startup
method
method
Execute SLP
1
instruction
Execute HALT
1, 2
instruction
Execute HALT
1, 2, 3
instruction
Execute HALT
1, 2, 3
instruction
aP-C-3
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