NUTINY-SDK-120 Nuvoton Technology Corporation of America, NUTINY-SDK-120 Datasheet - Page 43

• Manufacturer Part Number: NUTINY-SDK-120
• Description: BOARD EVALUATION NUC120 SERIES
• Manufacturer: Nuvoton Technology Corporation of America
• Series: NuMicro™r
• Type: MCUr

Specifications of NUTINY-SDK-120

• Contents: Board, Cable
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With/related Products: NUC120LE3AN, NUC120 Series

5.3.3
The system clock has 5 clock sources which were generated from clock generator block. The
clock source switch depends on the register HCLK_S (CLKSEL0[2:0]). The block diagram is
showed in Figure 5-5.
The clock source of SysTick in Cortex-M0 core can use CPU clock or external clock
(SYST_CSR[2]). If using external clock, the SysTick clock (STCLK) has 5 clock sources. The
clock source switch depends on the setting of the register STCLK_S (CLKSEL0[5:3]. The block
diagram is showed in Figure 5-6.
System Clock & SysTick Clock
22.1184 MHz
32.768 kHz
4~24 MHz
4~24 MHz
HCLK
Figure 5-6 SysTick Clock Control Block Diagram
Figure 5-5 System Clock Block Diagram
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1/2
1/2
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1xx
011
010
001
000
NuMicro™ NUC120 Data Sheet
STCLK_S (CLKSEL0[5:3])
Publication Release Date: Nov 11, 2010
STCLK
Revision V2.00