| ??? 04/03/10 21:05 Modified: 04/03/10 21:10 Read: times |
#174821 - It's a highly dynamical thing... Responding to: ???'s previous message |
Rickey said:
And in something simple like statically showing a number on a 7 seg I don't see why it needs to be reset. A microcontroller is a thing that is highly dynamically running inside. There's a clock which must start up at power-on and which only works properly after a few milliseconds. Then, there's an auxiliary potential to be generated about twice the supply voltage to allow the flash to be burned. Also, many registers and flip-lops, all the counters, PCAs, watchdog, UARTs are in a random state which must be initialized. In fact, there's nothing more important than a proper reset, one which highly reliably works at power-on, power-off and during supply voltage dips (brown-out conditions). In conjunction with the AT89S51/52, which you probably intend to use, I usually take a MAX1232, which contains not only a reset circuitry but also a watchdog, like in this example circuit: http://www.8052.com/forum/read/109257 and here http://www.8052.com/forum/read/109412 Kai Klaas |
| Topic | Author | Date |
| New with MCUs need a little help. | 01/01/70 00:00 | |
| Hi | 01/01/70 00:00 | |
| Some answers but now concerns | 01/01/70 00:00 | |
| Normally very weak source | 01/01/70 00:00 | |
| Can't find that detail | 01/01/70 00:00 | |
| Not many 805x's have push-pull outputs. | 01/01/70 00:00 | |
| Reset | 01/01/70 00:00 | |
| SDCC | 01/01/70 00:00 | |
| Books | 01/01/70 00:00 | |
| Electronics | 01/01/70 00:00 | |
| first read "the bible" | 01/01/70 00:00 | |
| Maybe not First? | 01/01/70 00:00 | |
| Rickey? | 01/01/70 00:00 | |
| I am new, Just somthing I wanted to do. | 01/01/70 00:00 | |
| Dead links | 01/01/70 00:00 | |
| No you are right | 01/01/70 00:00 | |
| hrm | 01/01/70 00:00 | |
| Argh!!! | 01/01/70 00:00 | |
| It's a highly dynamical thing... | 01/01/70 00:00 | |
| a reset writeup, but you don't want to read it now | 01/01/70 00:00 | |
| You mean this one? | 01/01/70 00:00 | |
Thanks | 01/01/70 00:00 | |
| not dead, just incorrectly copied | 01/01/70 00:00 | |
| Thanks | 01/01/70 00:00 |