An arrangement and method of reducing power in bidirectional I/O ports includes driving an input signal from an I/O port by asserting a high impedance (Hi-Z) signal to an output drive, driving an output signal from the I/O port by refraining from asserting a Hi-Z signal to an output driver, and feeding...http://www.google.com.hk/patents/US7859294?utm_source=gb-gplus-share專利 US7859294 - Method and arrangement for reducing power in bidirectional input/output ports
