| ??? 01/13/05 01:57 Read: times |
#84904 - Only One 8051 UART! Responding to: ???'s previous message |
Originally,
Wong Chi Fai said:
Is it possible to use a 8051/89C51/89C52 to drive 2 different serial COM ports? Now, Wong Chi Fai said:
If the 2 com port do not need to run at the same time, so that i connect the 2 com ports to the same MAX232 If you do that, the "far" end cannot tell that you have two different serial ports on the 8051, can it? So you might just as well use a single UART on the 8051, and devise some sort of software "protocol" to distinguish what's actually sendng the data?! There is no need for two COM ports on the PC, nor for two UARTs on the 8051! |
| Topic | Author | Date |
| How to drive 2 serial COM ports? | 01/01/70 00:00 | |
| soft UART | 01/01/70 00:00 | |
| hard UARTs | 01/01/70 00:00 | |
| How to drive 2 serial COM ports? | 01/01/70 00:00 | |
| Two 8052 | 01/01/70 00:00 | |
| Two - make one a cheapie | 01/01/70 00:00 | |
| cheap | 01/01/70 00:00 | |
| very | 01/01/70 00:00 | |
| If the 2 com ports do not need to run at | 01/01/70 00:00 | |
| Only One 8051 UART! | 01/01/70 00:00 | |
| The 2 COMs are from 2 different PCs. | 01/01/70 00:00 | |
| How to drive 2 serial COM ports? | 01/01/70 00:00 | |
| Try to use 74HC125 | 01/01/70 00:00 | |
| Better at inputs! | 01/01/70 00:00 | |
| Thanks very much | 01/01/70 00:00 | |
| Why two MAX232 chips? | 01/01/70 00:00 | |
One is enough! | 01/01/70 00:00 |