M0516ZAN Datasheet, PDF (27/71 Pages) List of Unclassifed Manufacturers – ARM Cortex™-M0 32-BIT MICROCONTROLLER

NuMicro^™ M058/M0516 Data Sheet
6.3 Clock Controller
6.3.1 Overview
The clock controller generates the clocks for the whole chip, including system clocks and all
peripheral clocks. The clock controller also implements the power control function with the
individually clock ON/OFF control, clock source selection and clock divider. The chip will not enter
power down mode until CPU sets the power down enable bit (PWR_DOWN_EN) and Cortex-M0
core executes the WFI instruction. After that, chip enters power down mode and wait for wake-up
interrupt source triggered to leave power down mode. In the power down mode, the clock
controller turns off the external 4~24 MHz high speed crystal and internal 22.1184 MHz high
speed oscillator to reduce the overall system power consumption.
6.3.2 Clock Generator Block Diagram
The clock generator consists of 4 sources which list below:
z One external 4~24 MHz high speed crystal
z One internal 22.1184 MHz high speed oscillator
z One programmable PLL FOUT(PLL source consists of external 4~24 MHz high speed
crystal and internal 22.1184 MHz high speed oscillator)
z One internal 10 kHz low speed oscillator
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Publication Release Date: May 30, 2011
Revision V2.00