what's the difference between sctimer and ctimer?

[jren68]

I  am looking at the pwm examples provided by a lpc54xxx board. I noticed both  ctimer  and sctimer have been used.

Can someone explain what's the difference?

[kerryzhou]

Hi Jenny Rendall,

    Please check the LPC54XXX user manual, just from the module features, you can find the SCT have more functions than CTIMER, Ctimer is just a couter/timers, but the SCT can be used as timer, PWM module, and it has the states event control.

  More details, you can check the module feature, that is very clear.

  After you check the user manual, if you still have questions about it, please kindly let me know.

Have a great day,
Kerry

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[jren68]

I saw both ctimer and sctimer were used for PWM in the imported SDK examples and wasn't sure which to choose, and was wondering if someone could share some insights. Thanks for the reply!

[kerryzhou · Accepted solution]

Hi Jenny,

   Yes, Ctimer also support the PWM operation, but the Ctimer don't have the event and state control feature, SCTimer can support two 16bit counters or one 32bit counter, but Ctimer just support 32bit counter/timer,  SCTimer support inputs and outputs is more than Ctimer. SCTimer can support dual-edge PWM outputs, but Ctimer can't realize it.

   We can compare the Ctimer feature with the SCTimer:

1. Ctimer

2. SCTimer

            

Wish it helps you!

Have a great day,
Kerry

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[JJ3]

Dear kerryzhou,
I try to use the ctimer simple_pwm_interrupt demo to control the rgb led, how can I control the led on delay by the pwm cycle count insteal of the function bsp_delay_time. It's means I must use the sctimer output PWM?