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PFS172 Datasheet(PDF) 34 Page - PADAUK Technology. |
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PFS172 Datasheet(HTML) 34 Page - PADAUK Technology. |
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34 / 92 page  PFS172 8bit MTP MCU with 8-bit ADC ©Copyright 2020, PADAUK Technology Co. Ltd Page 34 of 92 PDK-DS-PFS172-EN_V000-May 8, 2020 5.4.6. System Clock Switching After IHRC calibration, user may want to switch system clock to a new frequency or may switch system clock at any time to optimize the system performance and power consumption. Basically, the system clock of PFS172 can be switched among IHRC, ILRC and EOSC by setting the clkmd register at any time; system clock will be the new one after writing to clkmd register immediately. Please notice that the original clock module can NOT be turned off at the same time as writing command to clkmd register. The examples are shown as below and more information about clock switching, please refer to the “Application Note” -> “IC Introduction” -> “Register Introduction” -> CLKMD”. Case 1: Switching system clock from ILRC to IHRC/2 … // system clock is ILRC CLKMD.4 = 1; // turn on IHRC first to improve anti-interference ability CLKMD = 0x34 ； // switch to IHRC/2, ILRC CAN NOT be disabled here // CLKMD.2 = 0 ； // if need, ILRC CAN be disabled at this time … Case 2: Switching system clock from ILRC to EOSC … // system clock is ILRC CLKMD = 0xA6 ； // switch to EOSC, ILRC CAN NOT be disabled here CLKMD.2 = 0 ； // ILRC CAN be disabled at this time … Case 3: Switching system clock from IHRC/2 to ILRC … // system clock is IHRC/2 CLKMD = 0xF4 ； // switch to ILRC, IHRC CAN NOT be disabled here CLKMD.4 = 0 ； // IHRC CAN be disabled at this time … Case 4: Switching system clock from IHRC/2 to EOSC … // system clock is IHRC/2 CLKMD = 0XB0 ； // switch to EOSC, IHRC CAN NOT be disabled here CLKMD.4 = 0 ； // IHRC CAN be disabled at this time … Case 5: Switching system clock from IHRC/2 to IHRC/4 … // system clock is IHRC/2, ILRC is enabled here CLKMD = 0X14 ； // switch to IHRC/4 … Case 6: System may hang if it is to switch clock and turn off original oscillator at the same time … // system clock is ILRC CLKMD = 0x30 ； // CAN NOT switch clock from ILRC to IHRC/2 and turn off ILRC oscillator at the same time |
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