| ??? 03/05/07 14:59 Read: times |
#134296 - Depends... Responding to: ???'s previous message |
Mike said:
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? The 8052 are different refering to this issue. When powering-on some need a running clock from oscillator to set the ports to inputs, others do this immediately when the reset line is brought high. So, in the first case, using an synchronous port reset, for the duration of start-up time of oscillator the micro is danger to be damaged, because of not being properly reset at this time, while in the second case, using the asynchronous port reset, the micro isn't in danger. Kai |
| 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 |