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PWM in nRF51822

Hi, I am using nRF51822 to generate two channels PWM to control motors. Softdevice is V5.2.1. But I found the the Blue tooth connection sometimes dead if the PWM frequency is high. I set the frequency to 300Hz it ran well, but when I set the PWM frequency over 2kHz, the Blue tooth connection was dead after a random period. May I have an advice about the PWM frequency limitation without Blue tooth connection affection? Thanks.

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