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Should CTS# and RTS# signals of RS232C driver be connected directly?

Latest Updated:06/20/2013

Question:

It seems that input and output of CTS# and RTS# signals are performed by one pin. Should the CTS# and RTS# signals of the RS232C driver be connected directly to this pin?

Answer:

The CTS enable bit (SPMR.CTSE) determines whether the CTS#/RTS# pin is used exclusively for either CTS or RTS functions. Therefore, even if CTS# and RTS# signals from the driver are connected to one pin on the RX, only one of the functions (CTS# or RTS#) can be used.
When both CTS# and RTS# are needed, please consider setting the SPMR.CTSE bit to 1 (CTS pin function is enabled) to use the CTS#/RST# pin for CTS functions, and substituting the output function of another general port for RTS functions.
Suitable Products
RX630
RX63N, RX631
RX63T
RX210
RX220
RX110
RX111