| 摘要 |
A data processing apparatus has a single serial port, a data transmitting circuit, an output buffer circuit, and a data comparing circuit, and transmits serial data to an external data processing terminal. Serial data to be serially transmitted which is successively generated by the data transmitting circuit is buffered by the output buffering circuit, and serially transmitted from the serial port to the data processing terminal. The data comparing circuit confirms whether serial data transmitted from the data transmitting circuit to the output buffer circuit and serial data transmitted from the output buffer circuit to the serial port agree with each other or not. For example, if a data error occurs in serial data serially transmitted from the data processing apparatus to the data processing terminal due to noise introduced into the serial port, then the data comparing circuit detects that the serial data transmitted from the output buffer circuit to the serial port differs from the serial data transmitted from the data transmitting circuit to the output buffer circuit.
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