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M58-ZC Datasheet(PDF) 32 Page - Nuvoton Technology Corporation

Part No. M58-ZC
Description  32-BIT MICROCONTROLLER
Download  71 Pages
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Maker  NUVOTON [Nuvoton Technology Corporation]
Homepage  http://www.nuvoton.com
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M58-ZC Datasheet(HTML) 32 Page - Nuvoton Technology Corporation

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NuMicro
M058/M0516BN Datasheet
Publication Release Date: Mar. 19, 2012
- 32 -
Revision V1.01
6.3.3
System Clock & SysTick Clock
The system clock has 4 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
shown in the Figure 6-4.
111
011
010
001
PLLFOUT
Reserved
4~24 MHz
10 kHz
HCLK_S (CLKSEL0[2:0])
22.1184 MHz
000
1/(HCLK_N+1)
HCLK_N (CLKDIV[3:0])
CPU in Power Down Mode
CPU
AHB
APB
CPUCLK
HCLK
PCLK
Figure 6-4 System Clock Block Diagram
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 4 clock sources. The
clock source switch depends on the setting of the register STCLK_S (CLKSEL0[5:3]. The block
diagram is shown in the Figure 6-5.
111
010
HCLK
4~24 MHz
STCLK_S (CLKSEL0[5:3])
STCLK
22.1184 MHz
001
1/2
1/2
4~24 MHz
011
1/2
000
Reserved
Figure 6-5 SysTick clock Control Block Diagram


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