I'm still not sure how "except that it is only recognized when it has been low since the last time it was recognized." differs from being edge-triggered, however. (At least, his answer sounds correct to me, even though I'm not familiar with the 8085.) Golaz and vsz's answer assumes that the interrupt is masked. And I haven't, either.ĭ Krueger's answer correctly explains what it means to be both level- and edge- triggered. My impression is that no one has really answered what it means to be both level- and edge- triggered. That is, it will leave and re-enter the ISR again and again, as long as the pin is low. So if you have low-level interrupt set, MCU will keep executing the Level interrupts gets fired as long as the pulse is low or high. In short, edge interrupt gets fired only on changing edges, while Low-level/high-level signal on the corresponding pin.
You say) is set the ISR will get fired everytime there is a If edge interrupt is set, the ISR will only get fired onįalling/rising edge of a pulse. That is the general description of the triggering mechanisms and those also apply to the 8085 interrupts. But keep in mind after the the input, it can be processed in all the time till the next input is taken. Similarly input is taken at exactly the time in which the clock signal goes from high to low in negative edge triggering. For example if the circuit is positive edge triggered, it will take input at exactly the time in which the clock signal goes from low to high. We can have a negative level triggering in which the circuit is active when the clock signal is low or a positive level triggering in which the circuit is active when the clock signal is high.Įdge Triggering: In edge triggering the circuit becomes active at negative or positive edge of the clock signal. But before going to know about this flip-flop, one has to know about the basics of flip-flops like SR flip flop and JK flip flop. This article discusses an overview of the master-slave flip flop. Level Triggering: In level triggering the circuit will become active when the gating or clock pulse is on a particular level. The working of these circuits can be done by utilizing previous circuit input, CLK, memory, and output. Depending upon the type of triggering mechanism used, the circuit will become active at specific states of the clock pulse.
The triggering is given in form of a clock pulse or gating signal.
Now there are basically two types of triggering. When the circuit is not triggered, even if you give some input data, it will not change the data stored inside the flip-flop nor will it change the output Q or Q'. Like for example supposed we have a flip-flop. Making a circuit active means allowing the circuit to take input and give output. Triggering: This means making a circuit active. Some flip flop are other logic units are triggered when the clock reaches prescribed voltage levels or goes from one voltage level to another usually without regard to voltage rise or fall time. I didn't read you document really, but I can understand why you are confused.