need one more RXD UART in 89c51

[hiclickme]

uart in 89c51

Hi
I am a new beginner at microcontroller. I started it by Atmel 89c51. Now I am doing a project need 2 inputs and 1 ouput UART by 19200 bauds. How to do it? software

thanks for advance

 

[pisoiu]

89c51 dual uart

Hi,
One serial port (1 out and 1 in) is available as hardware device inside the uC. A serial transmitter is easy to implement by software, but a receiver is much more complicated, because it will use very much of your processor resources. Maybe it will be better to choose a hardware approach for the second serial port, like MAX3100 from Maxim.

/pisoiu

 

[hiclickme]

dual uart 89c51

Hi,
Pisoiu, thanks for you advice. Now I plan to use a 74LS153 to share the RXD at different time.

 

[mgajo]

Dallas 80C320 is dual uart 8051

 

[conkhicon]

Hi
It is very easy problem.
You found it in MCS51 Architecture, Part Communication with Multicontroller.
MCS51 has support a lot of receive port which is seperate by Slave Address but only one transmit port.
You will be config UART in MCU with mode 2 (multiMCU).
For detail, please send me minhnam@vnws.com