| ??? 03/05/07 14:30 Read: times |
#134293 - Picky, Picky, Picky Responding to: ???'s previous message |
Let me try again.
When the 8051 is in reset, all ports are set to 0FFh. Given the "quasi-bidirectional" nature of the 8051 ports, this is equivalent to all pins being an input. Logically, this is the only choice for port pins during reset. Any other choice would result in a port pin being an output, and that could potentially result a short between the 8051 output and an external driver. |
| 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 |