| ??? 12/19/07 08:34 Read: times |
#148498 - Long duration timer |
Here is another question. I am trying to start a motor and run it for 30 minutes at a particular time of the day without human intervention. How to generate the time interval of 30 minutes with only 89C2051? Earlier stuff I did were for very short intervals and presented no problem.
This is whay I propose - Use a 32.768 crystal which gives a timing interval of approximately 20 seconds. For 30 minutes I need to do the timing approximately 90 times and I tried my hand on the following code. Do you think it will work? What modification is required to make it work? I have for referecne both books of Predko and Ayala on 8051 ORG 0 mov sp,#030h ajmp main ORG 0Bh djnz R1,Timer reti Timer: mov th0,#02ah mov tl0,#0abh mov tmod,#00000001b mov ie,#10000010b mov tcon,#00010000b ;Start timer main: mov R1,#90 push DPL push DPH ajmp Timer Pop DPH pop DPL -|more code for mootor start routine|- Many thanks for your time and help Archer |
| Topic | Author | Date |
| Long duration timer | 01/01/70 00:00 | |
| Any MCU can do this with ease | 01/01/70 00:00 | |
Long duration timer | 01/01/70 00:00 | |
| I would not trust MCU for this but an RTC | 01/01/70 00:00 | |
| Wrong end of stick | 01/01/70 00:00 | |
| Wrong end of right stick | 01/01/70 00:00 | |
| It's all relative | 01/01/70 00:00 | |
| It\'s all relative , ya | 01/01/70 00:00 | |
| I see | 01/01/70 00:00 | |
| ya | 01/01/70 00:00 | |
| Ap is right | 01/01/70 00:00 |