求一单片机AT89C51汇编语言编程如下要求

汇编帮你写一个 Sec EQU 78H MM EQU 7BH TM BIT 00H STOP BIT 9H KEY_1_DL BIT 2H KEY_2_DL BIT 3H KEY_3_DL BIT 4H KEY_1_ZX BIT 5H KEY_2_ZX BIT 6H KEY_3_ZX BIT 7H FLG BIT 8H KEY_4_ZX BIT 10H KEY_4_DL