| ??? 02/13/08 06:54 Read: times Msg Score: -1 -1 Off-Topic |
#150698 - Minimum ISR time |
What is the minimum time needed to service a simple ISR and then return to the main program?
My 8052 has a 11.0592 MHz crystal. I wrote a program that increments a counter every time timer 1 overflows. I also have an ISR for timer 0 which fires every 50 msec. The timer0 ISR logs the number of times the timer 1 IRS counter was incremented in the 50 msec interval. I then tried different values for the timer 1 delay. I found that 40 usec was the smallest time I could use for timer 1 in order to reliably increment the ISR counter. Is 40 usec typical? That seems awfully long to me. Thanks!! |
| Topic | Author | Date |
| Minimum ISR time | 01/01/70 00:00 | |
| "bible" time? | 01/01/70 00:00 | |
| details | 01/01/70 00:00 | |
| re-expalin | 01/01/70 00:00 | |
| Re: Minimum ISR time | 01/01/70 00:00 | |
| what simple ISR? | 01/01/70 00:00 | |
| You're right, it is bloody C | 01/01/70 00:00 | |
| C and ISRs | 01/01/70 00:00 | |
| Know thy tools | 01/01/70 00:00 | |
'using' can be counterproductive in SDCC | 01/01/70 00:00 | |
| ISRs in C | 01/01/70 00:00 | |
| Good point | 01/01/70 00:00 |