32.3.1 Instruction-Based Power-Saving Modes

The dsPIC33A family of devices can operate in two instruction-based power-saving modes: Sleep and Idle. These modes can be entered by executing a special PWRSAV instruction. Sleep mode stops clock operation and halts all code execution. Idle mode halts the CPU and code execution but allows peripheral modules to continue operation. The assembler syntax of the PWRSAV instruction is shown in PWRSAV Instruction Syntax in Assembly and PWRSAV Instruction Syntax in C Language.

Note: SLEEP_MODE and IDLE_MODE are constants defined in the assembler include file for the selected device. Sleep and Idle modes can be exited as a result of an enabled interrupt, WDT time-out or a device Reset. When the device exits these modes, it is said to “wake-up.”

`PWRSAV` Instruction Syntax in Assembly


PWRSAV #SLEEP_MODE;  // Put the device into Sleep mode 
PWRSAV #IDLE_MODE;   // Put the device into Idle mode

`PWRSAV` Instruction Syntax in C Language


Sleep();    // Put the device into Sleep mode
Idle ();    // Put the device into Idle mode