| ??? 02/21/08 12:35 Read: times |
#151237 - Slow program execution |
Hi,
I have already worked a lot with AT89s8252, but only in the development board. Now I developed a PCB to work with it, but the microcontroller works very slow on it. If I connect the same micro in the development board, it works properly. I'm using a 11.0592 crystal (both in the development board and my PCB). Has anybody already experienced a thing like that. I mean, a reduced speed of program execution? I would apreciate if somebody could answer me. Is the PCB layout so critical that reduces the speed of execution? Thanks, Carlos Piereti |
| Topic | Author | Date |
| Slow program execution | 01/01/70 00:00 | |
| try something simple | 01/01/70 00:00 | |
| is it running at exactly 1/3 the devboard speed? | 01/01/70 00:00 | |
| 3rd overtone xtal not likely at 11.0592MHz... | 01/01/70 00:00 | |
| 3rd overtone crystal? | 01/01/70 00:00 | |
| yes, this means no overtone | 01/01/70 00:00 | |
| good catch | 01/01/70 00:00 | |
| I tried the blinking led... | 01/01/70 00:00 | |
| Slow? | 01/01/70 00:00 | |
| I've seen that | 01/01/70 00:00 | |
| this is not the case | 01/01/70 00:00 | |
| You're right | 01/01/70 00:00 | |
| sounds like intermittent clock | 01/01/70 00:00 | |
| Slow operation, normal UART | 01/01/70 00:00 | |
| I found the problem | 01/01/70 00:00 | |
| for what purpose? | 01/01/70 00:00 | |
| IIRC, it's vanilla in this respect... | 01/01/70 00:00 | |
| interrupt | 01/01/70 00:00 | |
| I can see an 'exotic' case or two | 01/01/70 00:00 | |
this is one of the reasons | 01/01/70 00:00 | |
| Please post your schematic? | 01/01/70 00:00 | |
| And photos? | 01/01/70 00:00 |