M054ZBN Datasheet, PDF (28/68 Pages) List of Unclassifed Manufacturers – 32-BIT MICROCONTROLLER

NuMicro^™ M052/M054BN 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 enter 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 crystal and internal 22.1184 MHz 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:
 One external 4~24 MHz crystal
 One internal 22.1184 MHz RC oscillator
 One programmable PLL FOUT(PLL source consists of external 4~24 MHz crystal and
internal 22.1184M)
 One internal 10 kHz oscillator
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Publication Release Date: Mar. 19, 2012
Revision V1.01