NUMICRO-SDK Nuvoton Technology Corporation of America, NUMICRO-SDK Datasheet - Page 192

• 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

5.3.3
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.
22.1184 MHz
32.768 kHz
PLLFOUT
4~24 MHz
10 kHz
System Clock & SysTick Clock
NuMicro™ NUC100 Series Technical Reference Manual
011
010
001
000
1xx
Figure 5-6 SysTick Clock Control Block Diagram
CPU in Power Down Mode
Figure 5-5 System Clock Block Diagram
HCLK_S (CLKSEL0[2:0])
- 192 -
HCLK_N (CLKDIV[3:0])
1/(HCLK_N+1)
Publication Release Date: Dec. 22, 2010
CPUCLK
HCLK
PCLK
Revision V1.06
CPU
AHB
APB