| ??? 06/12/07 06:30 Read: times |
#140568 - Best solution: IAP? Responding to: ???'s previous message |
They start in boot mode and switches after some milliseconds (look it up) to 'operate mode'.
The trick is to send a 'U' in that timeframe. Tha fact is that the autobaud is usefull in some cases and problematic in others. I don't know if designers at Philips/NXP thought about it, but I'm having problem with this "feature". What happens is that uP goes to programming mode when master application tries talking to uP board when uP is booting. What I'm doing is to take advantage of IAP feature:
This is the best I could come up with. I don't know if you have any better solution to work around this problem. PS: I'm going to post an excerpt of my solution which deals with both P89C51 and P89V51 chips at the same time in a transparent way. |
| Topic | Author | Date |
| Removing P89v51 Bootloader | 01/01/70 00:00 | |
| according to the datasheet.... | 01/01/70 00:00 | |
| Thanks Jan | 01/01/70 00:00 | |
| Maybe, but... | 01/01/70 00:00 | |
| Bootloader v7 and PSEN | 01/01/70 00:00 | |
| Details | 01/01/70 00:00 | |
| no pins needed ... | 01/01/70 00:00 | |
| Best solution: IAP? | 01/01/70 00:00 | |
| backdoor | 01/01/70 00:00 | |
| TxD pulled down for ISP. Clever! | 01/01/70 00:00 | |
| IAP | 01/01/70 00:00 | |
| if this is a problem | 01/01/70 00:00 | |
| the enhanced bootloader... | 01/01/70 00:00 | |
| what enhanced bootloader | 01/01/70 00:00 | |
| options | 01/01/70 00:00 | |
| no, did not | 01/01/70 00:00 | |
| OT: SiLabs -> NXP? | 01/01/70 00:00 | |
| no, NXP ->SILabs | 01/01/70 00:00 | |
SST89V516RD/SST89E516RD for 5V/3V part | 01/01/70 00:00 |