In interrupts, what is the difference between interrupt priority and interrupt priority?

FENFAXIANGSHANG

In interrupts, what is the difference between interrupt priority and interrupt priority? [Copy link]

In interrupts, what is the difference between interrupt priority and interrupt priority?

chunyang

Interrupt priority can be set, and higher priority interrupts will be responded to first. Different interrupts have different priorities within the same interrupt priority. For example, external interrupt 0 in the 51 series has the highest priority. Interrupts with higher priority will be responded to first. Interrupt priority cannot be set.

胡豆豆的春天

chunyang posted on 2017-3-31 21:16 Interrupt priority can be set, and higher priority interrupts are responded to first. In the same interrupt priority, different interrupts have different priorities. For example, the external interrupts in the 51 series...

So in the 51 single-chip microcomputer, interrupt 0 and timer 0, do these two belong to the same interrupt priority or the same interrupt priority? (In addition, I would like to ask: Can timer 0 be used to control interrupt 1?)

FENFAXIANGSHANG

chunyang posted on 2017-3-31 21:16 Interrupt priority can be set, and higher priority ones will be responded to first. In the same interrupt priority, different interrupts have different priorities. For example, the external interrupts in the 51 series...

You said that in the same interrupt priority, different interrupts have different priorities, so external interrupt 0, timer 0, external interrupt 1, timer 1, these should be 4 different interrupt priorities. For example, the priority of external interrupt 0 is the same interrupt priority. How can there be other interrupts in this priority? How can there be different priorities? What are the specific interrupt priorities?

chunyang

Hu Doudou's Spring published on 2017-3-31 21:23 So in the 51 single-chip microcomputer, interrupt 0 and timer 0, do these two belong to the same interrupt priority or the same interrupt priority? (In addition, I want to...

If the interrupt priority is not set or the same interrupt priority is set, external interrupt 0 and timer 0 are at the same interrupt priority, but external interrupt 0 has a higher priority. If timer 0 interrupt priority response is required, the interrupt priority of timer 0 needs to be set to high. As for whether timer 0 can be used to control external interrupt 1, the answer is that it cannot be controlled directly, because the timer output cannot be used as the input of the external interrupt, otherwise how can it be called "external interrupt"? Of course, there is a way to control it indirectly, using instructions to set a certain IO connected to external interrupt 1 to 0 according to the overflow of timer 0.

chunyang

FENFAXIANGSHANG posted on 2017-3-31 21:54 You said that in the same interrupt priority, different interrupts have different priorities, so external interrupt 0, timer 0, external interrupt 1, timer 1, this should be...

Pay attention to the wording: "Then external interrupt 0, timer 0, external interrupt 1, timer 1, these should be 4 different interrupt priorities" should be 4 different interrupt priorities. You used the wrong word, so you are naturally confused. Note that "level" comes first and "right" comes second. The one with priority level will respond first, and the one with higher right will respond first if the same level.

FENFAXIANGSHANG

[quote]chunyang posted on 2017-3-31 22:37 If the interrupt priority is not set or the same interrupt priority is set, the external interrupt 0 and timer 0 are at the same interrupt priority, but ...

chunyang

FENFAXIANGSHANG posted on 2017-4-1 09:22 "If you need to give priority to the timer 0 interrupt, you need to set the interrupt priority of timer 0 to high." I would like to ask, what method can be used to set the timer...

There is an interrupt priority register, please refer to the device manual for details.