The important reason to use PPL in the generation of the sys

The important reason to use PPL in the generation of the system clock is Flexible to program the system clock. Reduce the frequency of the input clock. Increase the clock frequency from either internal or clock oaeillator._The power consumption of a microprocessor is Independent of the clock frequency. Approximately proportional to the frequency of the CPU clock, c Approximately proportional to the frequency square of the CPU clock. After a system reset, the clock of a peripheral unit of the microcontroller Is disabled, b Is enabled. Is available inside the unit. Compared to a RC oscillator, a crystal oscillator Is easier to be integrated in a microcontroller. Costs less. C an generate a clock with more stable frequency. The clock of the independent watchdog Is the internal low-speed clock. Is the external low-speed clock. Can be selected between internal and external low-speed clock. A watchdog in the microcontroller Can be used as an independent timer. Requires to be accessed periodically in the normal system operation. Is used to generate a system reset automatically in the normal system operation.

Solution

3)The PLL used to Flexible to program the system Clock

4)The power consumption is Approximately Directly proportional to frequency of the CPU clock

5)After system reset, the clock periphral unit of microcontroller is enabled

6)The crystal osc genrate clock with more stable frequency than RC osc