| ??? 09/27/11 09:59 Read: times |
#183884 - ADUC 845 Bootloader |
Good morning to everyone:
I have a prototype made on the basis of the evaluation board of micro ADUC845/6/7 in which I have added a driver 485 and an operational amplier in the DAC output. Below is the drawing. The problem I find that putting the PSEN pin low level (GND) and do the reset, the bootloader does not start. I'm using the original TTL to 232 cable of the evaluation board to communicate with the PC (I take the power for this cable from AVDD and GND. I have the same configuration (I think) mounted on the evaluation board and everything works fine. What could be wrong? I would appreciate your help.  |
| Topic | Author | Date |
| ADUC 845 Bootloader | 01/01/70 00:00 | |
| TTL to 232 cable? | 01/01/70 00:00 | |
| RE:TTL to 232 cable? | 01/01/70 00:00 | |
| So how do you drive RESET? | 01/01/70 00:00 | |
| RE: So how do you drive RESET? | 01/01/70 00:00 | |
| 485 removed? | 01/01/70 00:00 | |
| RE:485 removed? | 01/01/70 00:00 | |
| yes, remove 485 | 01/01/70 00:00 | |
| RE:yes, remove 485 | 01/01/70 00:00 | |
| looks like a "throw together" | 01/01/70 00:00 | |
| RS485 removed... | 01/01/70 00:00 | |
| cable still working? | 01/01/70 00:00 | |
| RE:cable still working? | 01/01/70 00:00 | |
| Maybe I've missed something ... | 01/01/70 00:00 | |
| What? | 01/01/70 00:00 | |
| Sorry ... I hit "send" before I entered my message | 01/01/70 00:00 | |
| No more time today | 01/01/70 00:00 | |
| well, it seems you did it again | 01/01/70 00:00 | |
| It doesn't look that way from here ... | 01/01/70 00:00 | |
| ah an edit | 01/01/70 00:00 | |
| Yes ... I noticed a typo and it went from there. | 01/01/70 00:00 | |
| In studying the Data Sheet for this part | 01/01/70 00:00 | |
EA needs pull up | 01/01/70 00:00 |