Microchip Technology offers a tip/trick for users of its 8-pin Flash MCUs: a single I/O can be used for both a single direction communication and the power source for another microcontroller.
The I/O line is held high by the pull-up resistor connected to VDD (see diagram). The sender uses a pull-down transistor to pull the data line low or disables the transistor to allow the pull-up to raise it to send data to the receiver. VDD is supplied to the sender through the data line. The capacitor stabilises the sender's VDD and a diode prevents the capacitor from discharging through the I/O line while it is low. Note that the VDD of the sender is a diode-drop lower than receiver.
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