Patent ID: 7456657
Filing Date: 2008-11-25
Classification: H03K

Abstract:
1. A common input/output terminal control circuit, comprising: a first data selection circuit for selecting and outputting a data signal to be transferred to a common input/output terminal from among a plurality of data signals respectively output from a plurality of circuits; a direction selection circuit for selecting and outputting a direction control signal of the same circuit as a circuit of the data signal output from the first data selection circuit from among a plurality of direction control signals respectively output from the plurality of circuits; a data holding circuit for holding the data signal output from the first data selection circuit; a second data selection circuit for selecting and outputting one of the data signal output from the first data selection circuit and the data signal held by the data holding circuit; and an output circuit for outputting, to the common input/output terminal, the data signal output from the second data selection circuit when the direction control signal output from the direction selection circuit indicates an output direction.