| 摘要 |
PURPOSE:To input a pressure detecting signal to a setting-value alteration control means from a pressure detecting means, and to control the alteration of the setting of a numeric value displayed on a display means while changing a setting-time interval according to the signal by depressing a positive key switch of a negative key switch. CONSTITUTION:As the positive key switch and key switch for a zoom variable power, resistor switches 5 and 6 where a resistance value is changed by means of pressure produced by depressing are used. The switches 5 and 6 are connected to resistors R1 and R2, respectively. And their nodes are connected to the A/D converter inputs AN0 and AN1, respectively, of a microcomputer 1. The read of the inputted voltages by the resistor keys 5, 6 and the program by zooming display and control are executed at every interruption processing of an inner timer incorporated in the computer 1. In this case, the greater the pressure produced by depressing the resistor switches 5 and 6, the bigger the values of the AN0 and AN1; and the data which is set in the timer has a small value. The interruption processing period is determined by the data. The greater the pressure produced by depressing the resistance switches 5 and 6, the shorter the length of time that a numeric value for the the zoom display is altered for increase or decrease. |
