| 摘要 |
PURPOSE:To extend an electrifying time to a display tube, and to efficiently execute the display with small power consumption, by switching a digit of the display tube everytime a timer interruption is executed, and setting an interruption processing time for lighting the display tube, also other processing time in the course of a processing time of 1 digit portion. CONSTITUTION:Even if switch timing of a digit signal becomes a little longer, an interruption processing time for display is set to the beginning of each digit signal, the residual is used as other processing time, and all digits are repeated. By the timer interruption, a segment data signal is turned off, and the digit signal is switched. Subsequently, a segment data of the following digit is output- latched. After that, a return data of a key is inputted, processed and returned. Even in case of 16 digits, and a display time of 1 digit of 6.25%, other processing time can get as much as 70%. Also, since a display time per 1 digit is long, power consumption of the display tube is only 0.04AX40V=1.6W. |
