Chapter 4
SWRU191C–April 2009– Revised January 2012
Power Management and Clocks
Low-power operation is enabled through different operating modes (power modes). The various operating
modes are referred to as active mode, idle mode, and power modes 1, 2, and 3 (PM1–PM3).
Ultralow-power operation is obtained by turning off the power supply to modules to avoid static (leakage)
power consumption and also by using clock gating and turning off oscillators to reduce dynamic power
consumption.
Topic ........................................................................................................................... Page
4.1 Power Management Introduction ......................................................................... 64
4.2 Power-Management Control ............................................................................... 65
4.3 Power-Management Registers ............................................................................ 66
4.4 Oscillators and Clocks ....................................................................................... 69
4.5 Timer Tick Generation ........................................................................................ 72
4.6 Data Retention .................................................................................................. 72
63
SWRU191C–April 2009–Revised January 2012 Power Management and Clocks
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