I am implementing my LED Display code with a timer interrupt. Initially the ISR i used was small but it did not work for me (as more characters came, their scrolling speed also reduced). So i put the loading of next character in the ISR, due to which ISR is a bit longer than previous one.
When i compiled it, it gave me no erroe but as i put Kiel in demo mode and run my code, it gave me error 65 (and NOP).
When i executed instructions one by one to search for the error, then i saw that Keil is not returing back from ISR and gives this error 65.
This is maybe, i m using a large interrupt service routine of more than 8 bytes, but don't know the syntax in C to write a large interrupt service routine. Any help??