//Crystal is 12M// MPU: AT89S52// common cathode LED digital tube to tube, p0 mouth// keyboard scan port is p3 mouth,// ​ ​ 0 1 2 3----> P3.0// 4 5 6 7----> P3.1// 8 9 a b----> P3.2// cde f----> P3.3//! __! __! __! ______> P3.4//! __! __! ______> P3.5//! __! ______> P3.6//! ______> P3.7// Function: Keypad scan and a digital display

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