Do the PWM modules require usage of a general purpose timer

Drue Satterfield

Hello folks,

I heard from some colleagues that the PWM modules on the tm4c1294 device requires me to allocate one of my 6 general purpose timer modules for their usage. So in other words, I can't use my 6 GPT's while also using the PWM modules.

I haven't seen much in the data sheet to suggest it uses those 6 specific timers, but I want to check to make sure. Do the PWM generator modules use their own clocks separate from the 6 GPT's, or do they require using one of the GPT's?

over 8 years ago

0 cb1 over 8 years ago

Guru 47900 points

I'm unsure about your specific device - but all past vendor devices routed the System Clock into the PWM Module - and that module included a cascaded, digital divider - which enabled PWM Frequency Selection. Thus - no "Loss of your General Purpose Timers" occurred.

Review of the detailed, PWM Chapter w/in your MCU Manual should well detail - and confirm...

0 Amit Ashara over 8 years ago

TI__Guru**** 244400 points

Hello Drue,

That is incorrect. GP Timers and PWM module are two separate blocks. GP Timers also have PWM function but not as extensive as the PWM modules do. They may be having pin map that could clash, but this can be easily checked with the TI Pin Mux Utility.

0 Drue Satterfield over 8 years ago in reply to Amit Ashara

Prodigy 190 points

I shan't worry anymore about it then. Thank you kindly

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Do the PWM modules require usage of a general purpose timer