| ??? 09/04/09 20:39 Read: times |
#168732 - /INT0 : write 1 to config as i/p pin ? Responding to: ???'s previous message |
Hi All,
Thanks for the reply, but I guess I need still more guidance http://www.keil.com/dd/docs/d...v51rd2.pdf Page:8; Table:3; Row:2 Port 3 is an 8-bit bidirectional I/O port with internal pull-ups. Port 3 pins are pulled HIGH by the internal pull-ups when ‘1’s are written to them and can be used as inputs in this state. As inputs, Port 3 pins that are externally pulled LOW will source current (IIL) because of the internal pull-ups. Does it mean that I should write 1 to /INT0, so that it can be used as input port, for reading PIR module correctly... My issue is that interrupt is being called randomely, even when PIR module shows no activity (PIR tested OK); in other words P89V51RD2 wakes up even when its suppose to be sleeping. |
| Topic | Author | Date |
| Is pull-up needed for INT0 / INT1 | 01/01/70 00:00 | |
| Is the PIR output open collector? | 01/01/70 00:00 | |
| PIR is inverted using a BC547 | 01/01/70 00:00 | |
| Use a base-emitter resistor | 01/01/70 00:00 | |
| /INT0 : write 1 to config as i/p pin ? | 01/01/70 00:00 | |
| Of course you should be an input | 01/01/70 00:00 | |
Don't think that way! | 01/01/70 00:00 |