| ??? 08/23/05 21:52 Read: times |
#99934 - Some other things to think about Responding to: ???'s previous message |
If you add a second 2051, then it's possible that the protocol to move data between them will be as CPU intensive as a 2nd UART, but I have not seen this protocol so it's speculation.
Also, if you add an SPI or IIC UART then you will be doing the SPI or IIC bit-bang style. I think given the overhead, SPI would be preferred. I've used the MAXIM SPI UART and it works OK (expensive though), but bit-banging the SPI will limit your throughput somewhat, though it doesn't sound like your throughput will be very high. It begs to be asked why you are using a serial LCD when a bit-bang LCD interface uses only 6 pins (I think) and could easily be setup as a very low priority "task". GB |
| Topic | Author | Date |
| Bit-banging/software UART on a AT89C2051 | 01/01/70 00:00 | |
| this will be a mess when you do not have | 01/01/70 00:00 | |
| Re: this will be a mess when you do not | 01/01/70 00:00 | |
| now it is 3 devices | 01/01/70 00:00 | |
| Re: now it is 3 devices | 01/01/70 00:00 | |
| SW UART | 01/01/70 00:00 | |
| Re: SW UART | 01/01/70 00:00 | |
| Use a second 89C2051 | 01/01/70 00:00 | |
| you will have to anyhow | 01/01/70 00:00 | |
| The max has 2+2 drivers | 01/01/70 00:00 | |
| Some other things to think about | 01/01/70 00:00 | |
| TL16C754 software flow control question | 01/01/70 00:00 | |
what does that have to do with bit-bangi | 01/01/70 00:00 | |
| nope, there are many external UARTs ava | 01/01/70 00:00 |