In SX Microcontrollers, SX/B Compiler and SX-Key Tool, javalin wrote:

All,
 

Happy new year again!

 

Why would an ISR be skipped at RTCC roleover?

 

I.e. running for a UART VP every so-often the ISR will not fire at a RTCC $FF roleover even though RTCC roleover is enabled and there is a 1:1 pre-scaler?

 

Seems to happen when the RTCC is put back by the usual mov w,#-int_period and RETIW instructions, to a high ($A0 ish) value.

 

Im using an SX18 at 50mhz with the following DEVICE directive:

DEVICE SX18,OSCHS3,TURBO,STACKX,OPTIONX

 

I've checked with SX-SIM and I dont believe my code is overflowing the ISR (int_period is 108)

 

Cheers

 

james

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