AN1335 - APPLICATION NOTE

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8.4.1 - Bit Addressability and Interrupt Requests

XPWMCON0 and XPWMCON1 registers are not bit addressable and register XPWMCON0 has all the

interrupt request flags.

To avoid to loose interrupt requests, it is necessary to stop all the PWMs before changing the

XPWMCON0 register.

Changes in XPWMCON0 must ensure coherency (ie : uninterruptible read-modify-write sequence).

To make an instruction sequence uninterruptible, use ATOMIC instruction before the sequence.

8.4.2 - XPWM Software Advice Summary

– Stop all PWMs before changing XPWMCONx registers

– Change them using uninterruptible sequence (use ST10 ATOMIC #xx instruction).

– Re-enable PWM that were running as soon as changes are done to avoid increase in inaccuracy of the

PWM outputs.

9 - APPLICATION NOTE VERSION INFORMATION

9.1 - Revision of 29th of April 2001

This is the first version of AN1335.

9.2 - Revision of 24th of September 2013

Updated Disclaimer.