| ??? 01/16/05 00:55 Read: times |
#85028 - Try to use 74HC125 Responding to: ???'s previous message |
This is my design, is there any problem in the design?
J2 need to Rx data at any time, but J1 doesn't, if J1 is Tx data, J2 doesn't, and vice versa. For programming, i just need to control the output of the 74HC125, to enable either the TX of J1 or J2. So that MCU can be interrupted at any time J1 Rx data.  |
| 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 |