PWM calculation period and duty in LPC546

k_sunilgupta — Mon, 20 Jun 2022 04:58:03 GMT

Is there any calculation for generating the PWM of 20KHz.

my core clock is 180MHz.

i am using LPC54606J512BD100 micro controller.

If anyone know this please reply.

@mgnxp @Mike_M3

Re: PWM calculation period and duty in LPC546

xiangjun_rong — Mon, 20 Jun 2022 10:05:46 GMT

Hi,

Do you use CTimer module or SCTimer/PWM module to generate the PWM signal? If you use CTimer to generate the PWM signal, as you know that the PWM Reset match register will be

180MHz/20KHz=9K

so it is okay to set the match register as 9000 which reset the counter.

If you use SCTimer/PWM module, you can set the limit register as 9000, which sets up the PWM frequency.

Hope it can help you

BR'

XiangJun Rong

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PWM calculation period and duty in LPC546

Re: PWM calculation period and duty in LPC546