| ??? 12/01/07 15:34 Read: times |
#147693 - Edge triggered or level triggered? Responding to: ???'s previous message |
Another big question relates to the interrupt sources themselves. If they put out some sort of short pulse that you need to respond to, it's going to be hard to OR them together and figure out which one caused the interrupt unless you also latch the interrupts external to the MCU.
On the other hand, if they raise a signal that then has to be cleared by software before another interrupt is possible, it should be easy to OR the signals together and then just poll the devices to see which one(s) caused the interrupt. In any case, it sounds to me like you're going to need a little bit of external logic. -- Russ |
| Topic | Author | Date |
| three external IRQ and only one IRQ pin availble | 01/01/70 00:00 | |
| Polled interrupts | 01/01/70 00:00 | |
| Need more input | 01/01/70 00:00 | |
| A Multiplexer ! | 01/01/70 00:00 | |
| Re | 01/01/70 00:00 | |
| request for more info | 01/01/70 00:00 | |
| Edge triggered or level triggered? | 01/01/70 00:00 | |
| more information | 01/01/70 00:00 | |
| and IRQ is edge triggered... | 01/01/70 00:00 | |
| there are many possibilities | 01/01/70 00:00 | |
| RE:there are many | 01/01/70 00:00 | |
| if it don't show your code | 01/01/70 00:00 | |
| comparators works great | 01/01/70 00:00 | |
| three by two | 01/01/70 00:00 | |
does not work | 01/01/70 00:00 |