| ??? 02/21/08 22:29 Read: times |
#151276 - this is one of the reasons Responding to: ???'s previous message |
Erik Malund said:
I can see an 'exotic' case or two, for instance the signal being controlled by a PNP transistor connected to Vcc (careful now, if you ever set such a pin low in the code POW!!!) The POW!!! is the reason why it's not a good idea to use anything which needs pulldowns on '51. This is the old story: in hardware and software, everything is allowed; but there are things which are to be used with utmost care (and even then it often turns out it was not a good idea to use it). The reasons why to use "good old" solutions and methods are very often subtle and explicitly untold, but it pays off to "obey the rules". JW |
| 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 |