Introduction - If you have any usage issues, please Google them yourself
Using 4 4 keyboard, 16 key corresponding to 0 ~ 9+ in turn- and clear key Can be less than 255 the number of operations of addition, subtraction, multiplication, and division, and continuous operation When typing values greater than 255, will be automatically reset, you can re-enter the inversion method of scanning the keyboard, serial data output, 74 ls164 drive digital tube display P1 mouth to sweep the key signature input P3.0, P3.1 for serial data output connection serial static display module DIN CLK