Does the NuMicro® family provide the clock output pin to measure the internal or external clock?

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Henry
Posts: 41
Joined: 20 Mar 2017, 10:54

24 Mar 2017, 15:19

Yes, but it depends on the part No.
The measurement frequency will be Fin/2^1 to Fin/2^16, 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)
Clock Source.png
Clock Source.png (6.5 KiB) Viewed 407 times
CLKO.png
CLKO.png (6.96 KiB) Viewed 407 times
林昌宏/ Henry
新唐科技 / nuvoTon technology corporation
新竹科學工業園區30077研新三路4號
TEL : (03) 5770066#38077
Email : CHLIN55@nuvoTon.com

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