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Application Note, V1.0, Dec. 2006
A P 0 8 0 5 6
XC800 Family
P o w e r S a v i n g F e a t u r e s -
A c h i e v i n g L o w P o w e r R e q u i r e m e n t s o n
A p p l i c a t i o n s
M i c r o c o n t r o l l e r s

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Summarization of Contents

2 Stopping the CPU Clock (Idle Mode)
2.1 Entering and Exiting Idle Mode
Details how to enter and exit Idle mode by setting the PCON.IDLE bit. Discusses interrupt handling for power saving.
2.2 Ineffective Idle Mode
Explains scenarios where Idle mode may not reduce power consumption due to frequent interrupts or peripheral activity.
3 Reducing Clock Speed (Slow-Down Mode)
3.1 Combining Slow-down Mode with Idle Mode
Describes combining slow-down mode with idle mode (slow-down-idle mode) for enhanced power saving.
3.2 Slow-Down Mode vs. Slow-Down-Idle Mode Current Measurements
Presents current measurements comparing slow-down mode and slow-down-idle mode across different devices and frequencies.
4 Power Down of the Entire System (Power-Down Mode)
4.1 Entering Power-Down Mode
Details how to enter power-down mode by setting PMCON0.PD and managing wake-up sources and reset behavior.
4.2 Exiting Power-Down Mode
Explains exiting power-down mode via hardware reset or external wake-up signals (EXINTO/RXD pins).
6 Operating on a Lower Frequency Clock Mode
6.1 Device Clock in PLL Base Mode
Explains how the system frequency is derived from VCO base frequency in PLL base mode, including configuration.
6.2 Device Clock in Prescaler Mode
Details operating the system clock in prescaler mode, derived from oscillator clock divided by P and K factors.
8 A Timer 2 Example
8.1 Active and Idle Mode Current
Compares current consumption in active and idle modes for XC866-4FR and XC888 when timer 2 is active.
8.2 Slow-Down and Slow-Down-Idle Current
Analyzes current consumption in slow-down and slow-down-idle modes for XC866-4FR with timer 2 active.
8.3 Prescaler Mode Current
Examines current consumption in prescaler mode with slow-down and slow-down-idle modes for XC866-4FR and XC888.