LPC1768 - Problems PWM1.1 output

[tommitchell]

I use the LPC1768.

I have a problem that the first pwm output PWM1.1 (P1[18]) acts different then the other PWM output ports.

I use a period of 1 KHZ. (MR0=1000).

When I change the value for PWM1.1 port from maximum duty cycle (MR1=1001 or MR1=1000) to a new value then the first puls is always 1HKZ long and then all other pulses are the requested duty cycle.

This problem is only on PWM1.1. The other PWM ports I use don't have this problem.

Is this a known problem ?

Am I doing something wrong ?

[tommitchell]

I found the problem/answer: Errata Sheet ES_LPC176X section 3.13

The workaround works well.

[kerryzhou]

Hi Tom,

Thank for your solution sharing.

If you still have problem, please let me know.

If your question is solved, please click the Correct Answer button to mark it as solved.

Have a great day,
Jingjing

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