| 摘要 |
<p>PROBLEM TO BE SOLVED: To reduce production costs by unnecessitating an asynchronous/ synchronous conversion system by performing asynchronous communication through a synchronous interface. SOLUTION: When an asynchronous serial signal 9a is inputted to a clock reception part, as a synchronous clock signal input, a synchronous communication interface 2 triggers a pulse 5a at the time in point of pulse input for ending communication for 8 bits and an interruption control part 4 triggers an interrupt signal 4a to a CPU 3. Corresponding to this trigger, the CPU 3 executes a synchronous communication program, simultaneously sends an interruption inhibit signal 3a to the control part 4, switches a reception part 5 to an output port 6 and waits for a fixed time. Afterwards, an asynchronous serial signal 6a controlled by an asynchronous program is sent to a personal computer 7. Then, the CPU 3 monitors a port 5, enables the reception of a command via the signal 9a inputted to the port 5 by decoding the signal 9a, sends an asynchronous serial signal 3b formed by the asynchronous communication program to the port 6 as a response and transmits the signal 6a.</p> |
