| ??? 03/15/08 19:15 Read: times |
#152283 - There is, but... Responding to: ???'s previous message |
Koosha said:
But I'm wondering why they always put an external resistor? as I know even in a simple AT89S51 , ther is an internal pull-down resistor on reset pin. can I provide power on reset only by using an external capacitor, why these books insist on an that external resisitor? Because the internal resistor extremely differs. 50k...300k represents a range of tolerance of +-70%. Kai |
| Topic | Author | Date |
| power on reset circuit | 01/01/70 00:00 | |
| Save some trouble for yourself... | 01/01/70 00:00 | |
| The Vcc supply is an important factor | 01/01/70 00:00 | |
| experiment | 01/01/70 00:00 | |
| all it's shown so far ... | 01/01/70 00:00 | |
| Please do further explain... | 01/01/70 00:00 | |
| Nothing complicated ... | 01/01/70 00:00 | |
| There is, but... | 01/01/70 00:00 | |
| it sounds atmel thinks it's ok | 01/01/70 00:00 | |
| No, they don't | 01/01/70 00:00 | |
| Aren't you frightened? | 01/01/70 00:00 | |
| The "toy" rule just changed ... | 01/01/70 00:00 | |
| same situation | 01/01/70 00:00 | |
| See the Atmel doc, then | 01/01/70 00:00 | |
I'd guess this depends on oscillator startup | 01/01/70 00:00 |