| ??? 12/08/04 13:21 Modified: 12/08/04 13:34 Read: times |
#82757 - config ports Responding to: ???'s previous message |
The reason that i chose Atmel is that atmel's processors are available in my country.
It is imminently possible that Atmel has processors with configurable ports, have a look. 1) I agree with Steve, if you can go serial (CAN -485- IIC - SPI - ???) you probably will be better off. 2) If you have to go parallel, using buffers will be a problems, that will make the lines non-bi-directional, or you will have to use '245 type chips, the control of which, in a multibranced circuit can be very tricky. With standard '51 ports bussed you wil have 2 problems. a) all the "weak pull-ups will be paralleled and that may exceed the drive capability of the output (check with datasheet). b) if a line is held low while a pin is switching high you will have enormous transients. Erik |
| Topic | Author | Date |
| Master / slave parallel bus | 01/01/70 00:00 | |
| suggestion | 01/01/70 00:00 | |
| info | 01/01/70 00:00 | |
| config ports | 01/01/70 00:00 | |
| serial parallel ? | 01/01/70 00:00 | |
| various | 01/01/70 00:00 | |
| atmel port 0 | 01/01/70 00:00 | |
| Port 0 as communicator | 01/01/70 00:00 | |
| Sorry, did not look | 01/01/70 00:00 | |
| reply | 01/01/70 00:00 | |
| supplier.. | 01/01/70 00:00 | |
| speed | 01/01/70 00:00 | |
| go on | 01/01/70 00:00 | |
| to the above | 01/01/70 00:00 | |
| Re: to the above | 01/01/70 00:00 | |
| open collector push-pull no way | 01/01/70 00:00 | |
| open collector and upsh-pull | 01/01/70 00:00 | |
| push pull drive, OC receive | 01/01/70 00:00 | |
| How to post ASCII Art | 01/01/70 00:00 | |
| All in one chip! | 01/01/70 00:00 | |
| Why parallel ? | 01/01/70 00:00 | |
CAN or cannot | 01/01/70 00:00 |