| 摘要 |
PURPOSE:To improve the title unit the points of the specification and function thereof by forming independent key contact circuit groups in an A/D input terminal and a general input terminal, and providing an input device consisting of a key matrix function within a program function of a microcomputer. CONSTITUTION:A power key, for example, is pressed for setting output. Then, independent contacts are closed and input signals are applied to an input terminal K1 and an A/D input terminal A/D1 of a microcomputer 5a. That is, a high level signal is input to the input terminal K1, and an A/D level signal is input to the input terminal A/D1 by means a ladder circuit provided in the outside. Now, the resolution of the ladder circuit is set at 3-level, and the A/D level when the key is pressed is set at one-level. The microcomputer 5a has a function to perform a program processing assuming a matrix structure of input terminals K1, K2, K3 and K4 and the A/D input terminals A/D1 and A/D2. Accordingly, the microcomputer 5a discriminates the nature of the key being pressed, and reads. In this case, the key is a power key. |
