| ??? 12/01/07 12:40 Read: times Msg Score: +1 +1 Good Answer/Helpful |
#147688 - Re Responding to: ???'s previous message |
Jay Dave said:
I have Three External IRQ and only have one IRQ pin on my controller. Which sources for the interrupts you want to connect? If you want to connect slow and bouncing mechanical contacts, then an interrupt was a very bad approach, since it cause lots of false detections. For all mechanical contacts only a timer interrupt should be used for debouncing and noise suppression. Which curious 8051 derivate mean you? All 8051 derivate should have at least 2 external interrupt inputs. And also the timers can be used to get 2 additional interrupt inputs (preload with 0xFFFF and set as counter). Peter |
| 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 |