Christian Bock

ESCI Receive problems when TIM overflow ISR is enabled

Discussion created by Christian Bock on Nov 10, 2006
Latest reply on Mar 5, 2008 by Hua Qian

I'm working with a HC908QB8. The ESCI receives without errors when the Timer ISR is disabled. If the Timer ISR is enabled, than it seems that the ESCI misses telegrams proportional to the time the ISR is called (about 5% of the messages are not recognized).
Additional Info: it is a LIN Bus application, baudrate is 9600bps, and each 100ms a frame header is send out by LIN master. I stay in the Timer ISR for about 5us.

Has anybody similar experience or an idea what I'm maybe doing wrong?