NUMICRO-SDK Nuvoton Technology Corporation of America, NUMICRO-SDK Datasheet - Page 191

• Manufacturer Part Number: NUMICRO-SDK
• Description: KIT EVAUATION NUC100/120/130/140
• Manufacturer: Nuvoton Technology Corporation of America
• Series: NuMicro™r
• Type: MCUr

Specifications of NUMICRO-SDK

• Contents: Board, Cable, CD, Nu-Link
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With/related Products: NUC100, NUC120, NUC130, NUC140

5.3
5.3.1
5.3.2
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 a 4-bit 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 4~24 MHz crystal and internal 22.1184 MHz oscillator to
reduce the overall system power consumption.
The clock generator consists of 5 clock sources which are listed below:
Clock Controller
Overview
Clock Generator
NuMicro™ NUC100 Series Technical Reference Manual
One external 32.768 kHz crystal
One external 4~24 MHz crystal
One programmable PLL FOUT(PLL source consists of external 4~24 MHz crystal and
internal 22.1184 MHz oscillator)
One internal 22.1184 MHz oscillator
One internal 10 kHz oscillator
XTL12M_EN (PWRCON[0])
OSC22M_EN (PWRCON[2])
OSC10K_EN(PWRCON[3])
XTL32K_EN (PWRCON[1])
XT_OUT
XT_IN
X32O
X32I
Figure 5-4 Clock generator block diagram
22.1184 MHz
32.768 kHz
4~24 MHz
Oscillator
Oscillator
External
External
Internal
Internal
Crystal
Crystal
10 kHz
- 191 -
0
1
PLL_SRC (PLLCON[19])
Publication Release Date: Oct 22, 2010
PLL
22.1184 MHz
32.768 kHz
PLL FOUT
4~24 MHz
10 kHz
Revision V1.06