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implementing a simple half duplex rs232 emulation

Question asked by spectre on Jun 15, 2010
Dear forum members,

I need to implement on a st7 mcu a simple and very slow half duplex rs232 like protocol(software emulated).

I have only the following resources available:

1 16bit timer.
1 output pin for the tx (a general purpose pin without output compare)
1 input pin for the rx(a general purpose pin without input capture but with external interrupt)

My question is: Is it possible to use the external interrupt functionality instead of the input capture functionality for the reception ?