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Sleep_E/Sleep_E.ino

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+//Power Reduction Register (PRR)
+//
+//
+//The next thing to experiment with is the Power Reduction Register 
+//(PRR). This lets you "turn off" various things inside the processor.
+//
+//
+//The various bits in this register turn off internal devices, 
+//as follows:
+//
+//
+//    Bit 7 - PRTWI: Power Reduction TWI
+//    Bit 6 - PRTIM2: Power Reduction Timer/Counter2
+//    Bit 5 - PRTIM0: Power Reduction Timer/Counter0
+//    Bit 4 - Res: Reserved bit
+//    Bit 3 - PRTIM1: Power Reduction Timer/Counter1
+//    Bit 2 - PRSPI: Power Reduction Serial Peripheral Interface
+//    Bit 1 - PRUSART0: Power Reduction USART0
+//    Bit 0 - PRADC: Power Reduction ADC
+    
+#include <avr/sleep.h>
+#include <avr/power.h>
+
+void setup () 
+{
+
+  // disable ADC
+  ADCSRA = 0;  
+
+  // turn off various modules
+  power_all_disable ();
+  
+  set_sleep_mode (SLEEP_MODE_IDLE);  
+  noInterrupts ();           // timed sequence follows
+  sleep_enable();
+ 
+  // turn off brown-out enable in software
+  MCUCR = bit (BODS) | bit (BODSE);
+  MCUCR = bit (BODS); 
+  interrupts ();             // guarantees next instruction executed
+  sleep_cpu ();              // sleep within 3 clock cycles of above    
+}  // end of setup
+
+void loop () { }