| ??? 06/22/09 22:33 Modified: 06/22/09 22:37 Read: times |
#166372 - 20MHz and 57600 Responding to: ???'s previous message |
Jan Waclawek said:
Interestingly, at 57600 baud the error is small enough for both cases so it will autobaud on that baudrate every time The pdf for the ED2 says that this combination will work, but that is not true. Visit the link in my previous post. I've read somewhere (but now can't find where), that comm between host PC and ED2 is carried out w/o XON/XOFF chars. The way I understood it: FLIP sends more bytes then ED2 is capable of processing. ED2 will receive bytes correctly, but buffer overrun will occur. When ED2 sends bytes, then there is no problem - the PC has enough RAM. Well, this probably isn't true, but that is how I understood it. The flash programming is done in chunks of 128bytes, and ED2 has more than enough. In my particular case, I was able to read the flash with 57600, but not to program it faster that 9600. added: http://www.grifo.com/PRESS/DOC/Temic/flip_um.pdf page 13, time out error |
| Topic | Author | Date |
| AT89C51ED2 changing speed on its own | 01/01/70 00:00 | |
| apply proper reset | 01/01/70 00:00 | |
| apply proper reset | 01/01/70 00:00 | |
| then that's R0 not R1 | 01/01/70 00:00 | |
| MAX1232 + 4k7 pull-up | 01/01/70 00:00 | |
| I beliebe this chip has a built-in watchdog and thus ... | 01/01/70 00:00 | |
| I don't like those on-chip watchdogs and Vcc monitors | 01/01/70 00:00 | |
| Should be always on | 01/01/70 00:00 | |
| external vs internal | 01/01/70 00:00 | |
| .. | 01/01/70 00:00 | |
| Ground plane? | 01/01/70 00:00 | |
| no ground plane | 01/01/70 00:00 | |
| choose a "magic" frequency crystal ... | 01/01/70 00:00 | |
20MHz and 57600 | 01/01/70 00:00 |