Post by thread:Serial port lock-up problem

Hello, I have a strange (to me) problem on 16C63. It's implemented in remote control unit to send requests and receive status. All incoming status messages are only one byte long, separated by at least 1 mS. Serial interrupt is the only one used. ISR is pretty short (shorter than one byte anyway). And to prevent overrun I even read RCREG one more time at the end of ISR. Nevertheless after certain time (certain amount of messages?) controller stops receiving messages and only reboot helps. I am sure it's something simple (probably overrun), but I can't figure out where is the problem. Is there any way to prevent it? Will appreciate any help. Receiving routine follows. ;================ INTERRUPT_ROUTINE clrwdt (...........) content save ; bank1 ;switch to bank1 bcf PIE1,RCIE ;disable serial interrupt ; bank0 ;switch to bank 0 movf RCREG,0 ;read serial buffer movwf tempser ;store in temp location bcf PIR1,RCIF ;clear receive flag ;------------------- (..........) message development ;------------------ OUT_SER bank1 bsf PIE1,RCIE ;enable serial interrupt bank0 movf RCREG,0 ;just to clean ;------------ (...........) content restore retfie ;================================== Gennady Palitsky spam_OUTgennadypTakeThisOuTmainlink.net