| ??? 03/31/09 20:57 Read: times |
#164085 - test mode? Responding to: ???'s previous message |
An unspecific answer (I don't know the 'CCxx line at all):
Some (most?) '51 derivatives do have unpublished test modes, usualy entered when reset with some particular combination of logic levels on their pins. Sometimes this is accomplished by pulling pins, which are normally outputs (/PSEN, ALE), to ground or VCC during reset. Sometimes then excessive (even if capacitive) load on these pins may invoke such test mode spuriously. JW |
| Topic | Author | Date |
| Problems running T89C51CC01 from ext. memory | 01/01/70 00:00 | |
| test mode? | 01/01/70 00:00 | |
| I don't think so | 01/01/70 00:00 | |
| Maybe - protected ; | 01/01/70 00:00 | |
| Maybe not | 01/01/70 00:00 | |
| but you *can* try it...? | 01/01/70 00:00 | |
| I did | 01/01/70 00:00 | |
| What You did exactly? | 01/01/70 00:00 | |
| Erased lock bits | 01/01/70 00:00 | |
bad chip or ... | 01/01/70 00:00 |