33 lines
1.0 KiB
C++
Executable File
33 lines
1.0 KiB
C++
Executable File
#include <avr/sleep.h>
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//Brown-out disable
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//Another power saving can be made by disabling the brown-out detection.
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//To detect low voltages the processor must generate a voltage source for
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//comparison purposes. You can change the "extended fuse" (efuse) by using AVRdude,
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//like this:
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//avrdude -c usbtiny -p m328p -U efuse:w:0x07:m
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//
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//In SLEEP_MODE_PWR_DOWN mode, with brown-out disabled, the power went down
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//from 360 µA to 335 µA, a saving of 25 µA.
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//
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//Another way of turning off brown-out detection is to temporarily disable it like this:
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void setup ()
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{
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set_sleep_mode (SLEEP_MODE_PWR_DOWN);
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noInterrupts (); // timed sequence follows
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sleep_enable();
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// turn off brown-out enable in software
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MCUCR = bit (BODS) | bit (BODSE); // turn on brown-out enable select
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MCUCR = bit (BODS); // this must be done within 4 clock cycles of above
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interrupts (); // guarantees next instruction executed
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sleep_cpu (); // sleep within 3 clock cycles of above
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} // end of setup
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void loop () { }
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