| 摘要 |
PURPOSE:To stabilize read of a data, by reading a data of plural bits plural times at the same time, making a data of a prescribed bit effective, and making a data of other bit ineffective. CONSTITUTION:A CPU107A reads a data of each bit D0-D7 of a port P2 of an I/O107D by constant timing plural times, effectuates only a data of a bit in which the same data has been present at least 2 times or more continuoursly, in data of each bit D0-D7, which has been read, and makes a data of other bit ineffective. In this way, it is prevented that other invariable signals b-h cannot be read due to a signal (a) which is varied remarkably, and the read timing is delayed. |
