0到19点阵数字显示，数字由下向上滚，P0口送位选低电平，P1口送代码，已通过STC89C52RC开发板是实验-0-19 dot matrix digital display, digital roll from the bottom up, P0 port to send Choice of low, P1 I send the code, has passed STC89C52RC development board is an experiment