89S51 与数码管显示器以及键盘SW 对应引脚的联机为：

P0.0-------------------------数码管显示器的a脚

P0.1-------------------------数码管显示器的b脚

P0.2-------------------------数码管显示器的c脚

P0.3-------------------------数码管显示器的d脚

P0.4-------------------------数码管显示器的e脚

P0.5-------------------------数码管显示器的f脚

P0.6-------------------------数码管显示器的g脚

P0.7-------------------------数码管显示器的dp脚

；

P2.2-------------------------数码管显示器1的驱动脚

P2.3-------------------------数码管显示器2的驱动脚

P2.4-------------------------数码管显示器3的驱动脚

P2.5-------------------------数码管显示器4的驱动脚

P2.6-------------------------数码管显示器5的驱动脚

P2.7-------------------------数码管显示器6的驱动脚

；

P2.2-------------------------键盘SW1

P2.3-------------------------键盘SW2

P2.4-------------------------键盘SW3

P2.5-------------------------键盘SW4

P2.6-------------------------键盘SW5

P2.7-------------------------键盘SW6-devised with the digital control display and keyboard SW corresponding pin online : P0.0 - ------------------------ Digital Display of a foot P0 .1 ------------------------- LED display b feet P0.2 ------------------------- Digital Display foot width of the c-- ----------------------- LED display d feet P0.4 - --- --------------------- LED display e feet P 0.5------ ------------------- Digital Display f Encl foot-------- ----------------- LED display g feet P0.7 - --------- --------------- LED display dp feet; P2.2 - ------------------------ Digital Display Driver feet of a P2.3 - ------------------------ Digital Display Driver 2 feet P2.4 - ------------------------ Digital Display Driver 3 feet dry weight------------------------- Digital Display Driver 4 feet P2.6 - ----------------------