| 摘要 |
The present invention relates to communications in which transmit data generated in processes in which a utilization portion performs arbitrary application processing are transmitted to an exterior in accordance with a previously determined protocol in a control portion. A RAM comprises a transmission buffer and a management table for managing a state where each of the transmit data, whose request for transmission has been accepted by the control portion, is transmitted and the location, on the transmission buffer, of the transmit data. The utilization portion outputs, when the transmit data is generated, a request to acquire a data write area to the control portion. Correspondingly, the control portion refers to the management table, to specify a data write area where writing is newly allowed in the transmission buffer and present the specified data write area to the utilization portion. The utilization portion writes the transmit data into the presented data write area.
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