When does an Interrupt Interrupt?

[retepsnikrep]

Take the following line of code, which is in a repeating loop of other simple code until an interrupt is recieved.

CellV = RefVADC *25 / RefADC * 100 / 25

Will an Interrupt interrupt it, or will it complete the entrie line before interrupting?

I understand the general principle about interrupts being actioned after every command.

I wan't to use an interrupt, but I dont want the above calculation broken by the program jumping out of the line, as after the interrupt is generated my code sends the result of this to another program.

I know preserving the previous result from the last loop works, so the routine sends the earlier result to avoid potential errors but do I need to do this?

 

[hippy]

An interrupt will only occur when the current statement is finished. In this case the calculation will complete before an interrupt will happen ( although it can also happen before it starts the calculation so take care that data an Interrupt uses has been calculated before allowing the first interupt ).

 

[westaust55]

It works as Hippy states.

The PICAXE manual 2 makes this clear:

The inputs port is checked between execution of each command line in the program, between each
note of a tune command, and continuously during any pause command.

That is, not during the processing of each command line other than for a tune or pause command.