| ??? 10/06/05 06:46 Read: times |
#102011 - dallas Responding to: ???'s previous message |
I'm using the Dallas 420 derivative. I built a board last night
which I'm having problems with in that it will not get into the boot loader. I've got an 8Mhz crystal in it. Reason I was asking is because in that table there (from the link you gave me), you can clearly see 8Mhz is supported at several baud rates for the bootloader, but in the Dallas datasheets there is no such table. I would assume these two derivatives are similar. There are several changes I am using over previous circuits. This circuit is designed to be a little "line following" robot, so it will only need to be programmed once. As such, I didn't use the DTR/DSR line from the serial port to trigger the boot loader. I am manually bringing RSET, PSEN and EA to 1,0,0 with jumpers. I will check the board again to see if I left something out or got one little line wrong, but I don't think I did - however, I do think the loader is responding, because when I attempt to connect to it with the MTK, in some baud rates, I get "junk" data back, indicating a response at a different serial rate. Any other thoughts? |
| Topic | Author | Date |
| Other crystals? | 01/01/70 00:00 | |
| my experience | 01/01/70 00:00 | |
| dallas | 01/01/70 00:00 | |
| RTFM | 01/01/70 00:00 | |
| the speedy '450 | 01/01/70 00:00 | |
| why 8MHz? | 01/01/70 00:00 | |
| crystals | 01/01/70 00:00 | |
| '420 | 01/01/70 00:00 | |
| errata? | 01/01/70 00:00 | |
| 22.1184MHz | 01/01/70 00:00 | |
| since when? | 01/01/70 00:00 | |
| the tiny asterisk... | 01/01/70 00:00 | |
| Baud rates | 01/01/70 00:00 | |
| crystals, but problem fixed.... sorta :) | 01/01/70 00:00 | |
| 10472 baud | 01/01/70 00:00 | |
| but Atmel | 01/01/70 00:00 | |
| 8 bits autobaud | 01/01/70 00:00 | |
| explanation | 01/01/70 00:00 | |
| dallas | 01/01/70 00:00 | |
| 7.3728MHz | 01/01/70 00:00 | |
| Lower clock frquency | 01/01/70 00:00 | |
| backslashes | 01/01/70 00:00 | |
| New Server Problems? | 01/01/70 00:00 | |
| lol | 01/01/70 00:00 | |
| Go on laughing... | 01/01/70 00:00 | |
| rise/fall time? | 01/01/70 00:00 | |
| that is absolutely correct, but what mak | 01/01/70 00:00 | |
| jetplanes | 01/01/70 00:00 | |
| It's a combination of both | 01/01/70 00:00 | |
| thread | 01/01/70 00:00 | |
This is for the XA which has a UART that | 01/01/70 00:00 |