| ??? 04/19/06 14:44 Modified: 04/19/06 14:47 Read: times |
#114527 - nos and yes's Responding to: ???'s previous message |
I said:
you need no extra pin on the processor for the "Auto" option, it's still just Rx and Tx (and, of course, /PSEN and RESET)! The "extra" signals come from the PC's COM port... Erik Malund said:
the "extra" signals still need to be connected to a pin OK so once again, more slowly. For ISP "hardware" entry, you need Rx, Tx, /PSEN and RESET. The "autoISP" circuit connects to Rx, Tx, /PSEN and RESET. The "manualISP" circuit connects to Rx, Tx; /PSEN is grounded via a switch or jumper manually and the chip is reset usually by a power cycle. Using "NoTouch (C)Erik" you need Rx, Tx. I see no significant difference in pin usage. I see no reason to spare /PSEN notabene RESET as a pin. I said:
However, you still might need an A) emergency solution and also for the B) "first time" programming Erik said:
A) "the backdoor" takes care of that.
B) a factory fresh chip IS in ISP mode B is 100% true; however, the "backdoor" is no emergency solution. Emergency is, e.g. when someone @#$%s the programming so that the user program (nor backdoor then) runs correctly. A pushbutton or two pins for a jumper hurt nothing. Jan Waclawek PS. Personal experience. I've just "locked up" a LPC932A1, NoTouch (C)Erik installed, just I made a tiny error during device programming, burning an incorrect file... Of course, no last resort (at least not a quick one), the chip in TSSOP soldered firmly down, only Rx and Tx leads to outer world... OK this is for hobby, can wait a moment in the drawer... |
| Topic | Author | Date |
| AT89C51ED2 ISP Hardware configuration | 01/01/70 00:00 | |
| from the source | 01/01/70 00:00 | |
| I will try it. | 01/01/70 00:00 | |
| because it would make datasheets books | 01/01/70 00:00 | |
| family documents | 01/01/70 00:00 | |
| Philips is good in this respect | 01/01/70 00:00 | |
| it's not philips | 01/01/70 00:00 | |
| ISP circuit | 01/01/70 00:00 | |
| Manual ISP | 01/01/70 00:00 | |
| use NoTouch | 01/01/70 00:00 | |
| handshake? | 01/01/70 00:00 | |
| yes'es and no's | 01/01/70 00:00 | |
| nos and yes's | 01/01/70 00:00 | |
| location dependent | 01/01/70 00:00 | |
| unlikely? | 01/01/70 00:00 | |
make a .bat file | 01/01/70 00:00 |