Sixbey, Friedman, Leedom & Ferguson, P.C.
Input-output interface circuit with multiplexers selecting an external signal or an internal output signal as the input signal from an I/O terminal
 An input-output interface circuit operative in three different modes which utilizes a first signal selector, operative selectively in an external signal output mode and an internal signal transmission mode, having one output terminal to which a signal is transmitted from a signal processor and first and second output terminals, a second signal selector, operative selectively in an external signal input mode and an internal signal transmission mode, having one output terminal through which a signal input to the signal processor is transmitted and first and second output terminals, the first output terminal of the first signal selector being connected to the external input-output terminal by an external output signal transmission channel; the second output terminal of the first signal selector being connected to the first input terminal of the second signal selector by an internal signal transmission channel; and the external input-output terminal being connected to the second input terminal of the second signal selector by an external input signal transmission channel. 
Mazda Motor Corporation
G
G06F
inventional
Kouichi Kiyoyuki Hideyuki
Nakamura Tsuchiyama Yamada