Abstract: A semiconductor device in which input terminals for external interrupts can be set as desired. A plurality of external input terminals can be specified as interrupt terminals which output an input signal to an external interrupt circuit via an interrupt terminal selector. A selection control circuit specifies whether a plurality of external input terminals are used as interrupt terminals. According to the selection control circuit, the interrupt terminal selector outputs to the external interrupt circuit an input signal entered from an external input terminal which is specified as an interrupt terminal out of the plurality of external input terminals.

Abstract: A semiconductor device in which input terminals for external interrupts can be set as desired. A plurality of external input terminals can be specified as interrupt terminals which output an input signal to an external interrupt circuit via an interrupt terminal selector. A selection control circuit specifies whether a plurality of external input terminals are used as interrupt terminals. According to the selection control circuit, the interrupt terminal selector outputs to the external interrupt circuit an input signal entered from an external input terminal which is specified as an interrupt terminal out of the plurality of external input terminals.

Abstract: A digital communication system includes a first station, a second station and a network therebetween. The first station includes a clock selecting device for selecting one clock from a plurality of different clocks; and a transmitting device for transmitting frames to the second station based on the selected clock. The second station includes an evaluating device for evaluating transmission quality of data in each of the frames received from the first station; and a quality message inserting device for inserting the evaluated transmission quality as a quality message into a part of the corresponding frame to be transmitted to the first station.