M058LAN Datasheet, PDF (30/71 Pages) Nuvotem Talema – ARM Cortex™-M0 32-BIT MICROCONTROLLER

NuMicro^™ M058/M0516 Data Sheet
6.3.3 System Clock and 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 6-5.
Figure 6-5 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 6-6.
Figure 6-6 SysTick clock Control Block Diagram
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Publication Release Date: May 30, 2011
Revision V2.00