| 摘要 |
A communication control device has a central processing unit (3), an input data buffer (14), an output data buffer (15), a readout reload register (17), an output reload register (18), and a timer (19) located between an input terminal (1) and an output terminal (2). The timer (19) reads count values stored in both the reload registers (17, 18) alternately, that have already been set by the central processing unit (3) according to a protocol to be processed, and performs a counting operation based on the count values. Communication data items stored in both the data buffers (14, 15) are latched based on a time out output from the timer (19).
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