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AX58200 Datasheet(PDF) 59 Page - ASIX Electronics Corporation |
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AX58200 Datasheet(HTML) 59 Page - ASIX Electronics Corporation |
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59 / 180 page ![]() 59 Copyright © 2019 ASIX Electronics Corporation. All rights reserved. AX58200 EtherCAT Slave Controller SoC Set HXTFDEN To enable HXT clock detector HXTFIF = 1? System clock source = “HXT” or “PLL with HXT” ? YES System clock keep original clock NO YES Switch system clock to HIRC NO Figure 2.3-4: HXT Stop Protect Procedure The clock source of SysTick in Cortex® -M4 core can use CPU clock or external clock (SYST_CTRL[2]). If using external clock, the SysTick clock (STCLK) has 5 clock sources. The clock source switch depends on the setting of the register STCLKSEL (CLK_CLKSEL0[5:3]). The block diagram is shown in Figure 2.3-5. 111 011 010 001 HXT LXT HXT HCLK STCLKSEL (CLK_CLKSEL0[5:3]) STCLK HIRC 000 1/2 1/2 1/2 Figure 2.3-5: SysTick Clock Control Block Diagram |
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