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M54-LN Datasheet(Fiches technique) 27 Page - Nuvoton Technology Corporation

Numéro de pièce M54-LN
Description  32-BIT MICROCONTROLLER
Télécharger  71 Pages
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Fabricant  NUVOTON [Nuvoton Technology Corporation]
Site Internet  http://www.nuvoton.com
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 27 page
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NuMicro
M058/M0516 Data Sheet
Publication Release Date: May 30, 2011
- 27 -
Revision V2.00
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:
One external 4~24 MHz high speed crystal
One internal 22.1184 MHz high speed oscillator
One programmable PLL FOUT(PLL source consists of external 4~24 MHz high speed
crystal and internal 22.1184 MHz high speed oscillator)
One internal 10 kHz low speed oscillator




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