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

0- I tried lowering the speed but that did not solve the problem. 
 

1- I also put a break line in the interrupt routine and the behavior is still the same. However, i noticed that it is not random as i thought it was before. Interestingly enough the interrupts trigger every third rollover of the RTCC. For example: after the first ISR the RTCC is reset to RTCC-50 but the debugger does not show an interrupt being issued on the next rolloff nor on the one after that but indeed on the third one. This happens EVERY time with any program that enables the RTCC. 
 

 


2- I can avoid the change on the ports by pulling them up so that is indeed solved. 

 

3- I doubt the the problem is due to EMF or RFI in the case of the RTCC as the problem persists in the same fashion in various locations. I tried it at my work computer, my house computer, my laptop, and with different cable lengths and at various distances from the computer. Anyway the regularity of the error kind of makes think it is not a noise issue. 

 

again here is the code i am runnig

 

DEVICE SX28L,OSCHS2,TURBO,STACKX,OPTIONX 
IRC_CAL IRC_SLOW
RESET Initialize
FREQ 50_000_000

 

ORG 0
  inc $0e
  mov w,#-50   
  retiw    
Initialize
  mov !option,#%10011111 ;enable rtcc interrupt
Main
:loop  
  jmp :loop

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