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FAQ / What is the Continuous Counting Operation mode for Timer controller?
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What is the Continuous Counting Operation mode for Timer controller? 1423562693726 The Continuous Counting Operation mode means that the Timer will continuously count from zero to 224-1 and restart to zero again. Each time the Timer interrupt event flag (TIF) is set by the hardware and the interrupt signal is generated when the value of 24-bit up-counting Timer counter matches the setting of TCMPR (Timer Compare Register).
FAQ / When will the Timer interrupt event flag (TIF) be set by hardware and how to clear it?
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When will the Timer interrupt event flag (TIF) be set by hardware and how to clear it? 1423562854576 The Timer interrupt event flag (TIF) will be set by hardware when the value of 24-bit up-counting Timer counter matches the setting of TCMPR (Timer Compare Register). This flag needs software to write 1 to clear it.
FAQ / What is the default state of General Purpose Input/Output (GPIO) after reset?
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What is the default state of General Purpose Input/Output (GPIO) after reset? 1423563022188 The default state of GPIO after reset may vary depending on the product series. The state of GPIO for M051 BN and NUC100 Series is in Quasi-bidirectional mode with weakly pull-high resistor (110 kΩ~300 kΩ), and the state of GPIO for Mini51 and Nano100 Series is in Input mode. However, the state of GPIO for M051 DN/DE and NUC200 Series depends on the setting of CIOINI (Config0[10]). If CIOINI is set to 1, all pins will be in Quasi-bidirectional mode after reset. If CIOINI is cleared to 0, all pins will be Input mode after reset.
FAQ / Are all of General Purpose Input/Output (GPIO) multifunction pins?
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Are all of General Purpose Input/Output (GPIO) multifunction pins? 1423563186137 No, but most of GPIO are the multifunction pins. Please refer to the Pin Description section in the NuMicro™ Cortex-M0 Series Product brief, Datasheet or Technical Reference Manual, and NuMicro™ Cortex-M4 Series Product brief, Datasheet or Technical Reference Manual.
FAQ / What clocks can still work in Idle and Power-down mode?
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What clocks can still work in Idle and Power-down mode? 1423563866112 In Idle mode, only the CPU clock is disabled. In Power-down mode, most clocks are disabled except the internal 10 kHz and the external 32.768 kHz clocks. As such, the RTC, WDT, Timer and PWM peripheral clocks are still enabled.
FAQ / Does the NuMicro™ family provide the flag to check and ensure the internal clock is stable?
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Does the NuMicro™ family provide the flag to check and ensure the internal clock is stable? 1423411200000 Yes, all the series except the NUC1xxAN series provide the flag, OSC22M_STB, in the CLKSTATUS register to ensure the internal (HIRC) clock is stable. Please refer to the related Technical Reference Manual for further information. Please add the following marked code after the internal clock is enabled. Case 1:(All series except NUC1xxAN series) while(SYSCLK->CLKSTATUS.OSC22M_STB == 0); // Check if (HIRC) clock is stable or not Case 2:(NUC1xxAN series) DrvSYS_Delay(5000); // Add delay to make sure (HIRC) clock is stable
FAQ / Does the NuMicro™ family provide the clock output pin to measure the internal or external clock?
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Does the NuMicro™ family provide the clock output pin to measure the internal or external clock? 1423411200000 Yes, but it depends on the part No. The measurement frequency will be Fin/21 to Fin/216, where Fin is the input clock frequency to the clock divider. Please check the pin configuration and get further information in the related Technical Reference Manual. Please refer to the following flow to measure the internal or external clock from clock out (CLKO) pin. Example: (NUC100 Series) /* Set GPIO pin as CLKO pin */ SYS->GPBMFP.CPO0_CLKO_AD0 = 1; SYS->ALTMFP.PB12_CLKO = 1; /* Frequency Divider Output */ SYSCLK->CLKSEL2.FRQDIV_S = 0; // select Fin source form 12 MHz SYSCLK->APBCLK.FDIV_EN = 1; // FRQDIV_CLK enable SYSCLK->FRQDIV.FDIV_EN = 1; // Divider enable SYSCLK->FRQDIV.FSEL = 0; // CLKO = Fin / 2(N+1)
FAQ / How many external interrupt sources the NuMicro™ family can support? Can all of GPIO pins be set as the sources to wake up a chip from Idle or Power-down mode?
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How many external interrupt sources the NuMicro™ family can support? Can all of GPIO pins be set as the sources to wake up a chip from Idle or Power-down mode? 1423411200000 All of the GPIO pins can generate external interrupts and all of them can be set as the sources to wake up the chip from Idle or Power-down mode.
FAQ / How to wake up the CPU from Idle mode?
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How to wake up the CPU from Idle mode? 1423411200000 CPU can be woken up from Idle mode by all interrupt sources.
FAQ / How to wake up the CPU from Power-down mode?
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How to wake up the CPU from Power-down mode? 1423411200000 EX: NUC442/472, CPU can be woken up from Power-down mode only by the interrupt sources listed below: GPIO, WDT, RTC, UART(/CTS), CAN, USB, ACMP, SDHOST and BOD. Please refer to the Features section in the related Technical Reference Manual for further information.
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