> Or you could just time the sender so that it send one byte every second.
> Waiting for an acknowledge byte is not as fast as using a port pin to
toggle
> the data flow. In the PIC, when you receive a byte, set the DTR (or DSR or
> RTS or CTS or whichever line the PC software respects, they are all
> different in this regard) pin low (or high if it's inverted by the driver)
> until you are ready for another one. The actual hardware handshaking does
> take place in hardware so there is no way it can overflow the way software
> handshakes can.
> /\/\/\/*=Martin

CTS is the pin the PC (DTE) pays attention to (input) for hardware flow
control.  CTS is generated (output) by a modem?(DCE)  RTS is generated by
the PC (output) and monitored by the DCE device (input).

BTW, hardware flow-control does NOT guarantee that no data overruns can
occur.  Hardware flow-control still depends on software to interpret the pin
indicating the FIFO is full and to set the appropriate (RTS) indicating that
no more data is desired.

michael brown

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