By F. Stevens
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Swap STATUS into W. Save STATUS. Place interrupt service routine here. 7 ; Swap and store in wsave. ; Swap and store in W. Using the timer One way of using the PIC to measure time intervals or count external pulses, is to write a simple program using the interrupt pin RB0/INT or to poll an ordinary input pin. The disadvantage of this is that the PIC is then unable to do anything else. To free the processor from total dedication to this task, the timer/counter module can be used. Unlike devices such as the PIC16C92X which have fully asynchronous timer/counter modules which operate during sleep and independently of the system clock, those of the PIC16X8X range operate in conjunction with the system clock and are disabled during sleep.
7. ). There are four interrupt flags, namely TOIF, INTF, RBIF and EEIF which are bits in the INTCON register and are set whenever that particular interrupt triggers, irrespective of whether it has been enabled by setting its corresponding enable flag. The interrupt enable flags are TOIE, INTE, RBIE and EEIE. From the diagram, it is evident that in order for any of the interrupt signals to have any effect, it is necessary to set the global interrupt bit, GIE, to enable any signal from the OR gate to pass through the rightmost AND gate.
Verify that the delay time is as expected. If the Step button is used, each individual instruction of the subroutine will be stepped through which will take about 8500 instruction cycles! asm, shows how the PIC can read the logical state of an input pin to determine what to do next. The program repeatedly reads the binary value of the pin voltage into the port register, performs a test and, based on the results, initiates a sequence of events. This type of behaviour is a typical requirement in microcontroller based systems.