Data communication apparatus for stabilizing the connection of a communication line between data communication apparatuses and program therefor

Abstract

A data communication apparatushas a processing section (CPU)that executes at least a part of communication processing of a communication controllerand that executes processing other than the communication processing, wherein The data communication apparatushas an interrupt request blocking sectionthat blocks, during execution of a processing relevant to information exchange concerning a communication condition for the communication controllerto carry out a communication processing, an interrupt request to the processing sectionwith priority over the processing relevant to information exchange. With this arrangement, even when additional operation is carried out to execute an interrupt processing during execution of a processing concerning a communication condition such as a modulation system of a modem and a communication speed, the processing can be executed securely and a stable connection of a communication line can be maintained.