topic Re: lpc541xx PLL Calculator in LPC Microcontrollers

lpc541xx PLL Calculator

hk123 — Thu, 10 Sep 2020 12:01:36 GMT

Hello All,

I am wondering if there is a reference utility pll calculator I can use.

Basically I have a board which has 25Mhz external crystal and I want to have the system clock to be 96 Mhz.

Can some one guide me as to PLL register settings I can use.

Best Regards.

Re: lpc541xx PLL Calculator

Sabina_Bruce — Sat, 12 Sep 2020 05:32:50 GMT

Hello ,

Hope you are doing well.

I'd recommend to use the clock config tool. Here you have a user friendly diagram which will help you configure the PLL accordingly. It also provides warnings when exceeding the limits of multiplier and divider. I attempted to get a 96 MHz system clock from 25 MHz input and got close but not exactly.

For more details on how to use the clock config tool, please review the Config Tool user guide.

Best Regards,

Sabina

Re: lpc541xx PLL Calculator

hk123 — Mon, 14 Sep 2020 06:47:19 GMT

This is perfect. Thanks Sabina.

Re: lpc541xx PLL Calculator

Sabina_Bruce — Mon, 14 Sep 2020 22:32:56 GMT

Glad to help!