| ??? 04/14/07 23:21 Read: times Msg Score: 0 +1 Good Answer/Helpful -1 Message Not Useful |
#137278 - Reading TriState Responding to: ???'s previous message |
Hendry:
Since you are using an 'LS245 all outputs of the device will be tri-state at the same time. You could determine the times when the port pins are in the tri-state mode by reading the state of the /OE control of the buffer device. For example if you had a circuit hooked up as follows: 
...you could determine when the Port 0 inputs were in the "tri-state" mode by peeking at the state of the Port 2 Bit 7 I/O pin and noting that it is in a High Level ("1" state) indicating that the 'HC245 buffer is in the OFF state. Michael Karas |
| Topic | Author | Date |
| tri state input reading | 01/01/70 00:00 | |
| tri-state | 01/01/70 00:00 | |
| Reading TriState | 01/01/70 00:00 | |
| Hi-Z reading | 01/01/70 00:00 | |
| Logic Probe Concept | 01/01/70 00:00 | |
| Window Comparator | 01/01/70 00:00 | |
| Build Or Buy | 01/01/70 00:00 | |
| Using Analogue Methods to test for Hi-Z | 01/01/70 00:00 | |
| Spare ADC and DAC on your micro? | 01/01/70 00:00 | |
| search found | 01/01/70 00:00 | |
| Some mistake | 01/01/70 00:00 | |
| 100k resistor | 01/01/70 00:00 | |
| An idea... | 01/01/70 00:00 | |
| Fundamental Logic and Hi-Z impedance | 01/01/70 00:00 | |
| Some thoughts on the tristate detection | 01/01/70 00:00 | |
| not 'the first', but THE problem | 01/01/70 00:00 | |
| Heisenberg | 01/01/70 00:00 | |
agreed | 01/01/70 00:00 | |
| thank you | 01/01/70 00:00 |