SPI port for RS232 communication

[edaboard_rao]

Hi
can anybody help me out by giving any idea , in using SPI port of a procesor for UART i.e. RS232 communication.If yes could pls tell me how.

 

[laktronics]

Hi,
In SPI, the data is sent out and received synchronised with a clock and even to receive a byte, you have to send out a dummy byte where as in a UART the data TX/RX is done asynchronously using start stop bits to package the data bytes in transmission. So, for a byte TX/RX, it requires a minimum of 10 bits for UART.

SPI is based on a master slave concept where it is always the responsibility of the master to issue clocks and send or receive a byte. There need not have any such relationship between two devices communicating over a UART.

Since these two systems are inherently different, they can not be connected directly, you need a converter in between.

Regards,
Laktronics