| ??? 03/04/07 00:50 Read: times |
#134228 - the RESET pin |
I'm starting a new thread because I think that the RESET pin can help me program the EEPROM. This topic is different from the "boolean algebra" topic.
I was just curious. When RESET is held high on a standard 8051 chip, are all port pins set to high-impedance? In other words, can I apply 0V or 5V without a resistor in series to any port pin on the microcontroller without damaging it as long as RESET is high? What I plan to do is use a couple of 74HC573 latches to hold the address and data from the parallel port, so that while the microprocessor is in reset (reset pin is high), I could program the EEPROM directly from the parallel port. I will also have to somehow tie the WE pin to the parallel port as well. I want to confirm this before I get carried away and find myself with a hot and useless 80C51-BH CPU. |
| Topic | Author | Date |
| the RESET pin | 01/01/70 00:00 | |
| Reset and Inputs | 01/01/70 00:00 | |
| thanks | 01/01/70 00:00 | |
| No, that's not true. | 01/01/70 00:00 | |
| Picky, Picky, Picky | 01/01/70 00:00 | |
| not picky Lynn, you need to read | 01/01/70 00:00 | |
| I stand corrected | 01/01/70 00:00 | |
| after reading the link | 01/01/70 00:00 | |
| not entirely | 01/01/70 00:00 | |
| I got the point | 01/01/70 00:00 | |
| That's funny... | 01/01/70 00:00 | |
| not exactly | 01/01/70 00:00 | |
| Please read again... | 01/01/70 00:00 | |
| Missing the point | 01/01/70 00:00 | |
| It looks quite simple to me | 01/01/70 00:00 | |
| but it is also an output | 01/01/70 00:00 | |
| There's no excuse! | 01/01/70 00:00 | |
of course not! | 01/01/70 00:00 | |
| I agree | 01/01/70 00:00 | |
| She? | 01/01/70 00:00 | |
| haha | 01/01/70 00:00 | |
| You\\\'re allowed to do whatever you want, | 01/01/70 00:00 | |
| Depends... | 01/01/70 00:00 | |
| so now what has been presented several | 01/01/70 00:00 | |
| I did read | 01/01/70 00:00 |