The design can achieve a 99-second countdown, including source code, HEX files, and KEIL project, C language programming program directly on the simulation is correct.

99秒倒计时
99秒倒计时.LST
99秒倒计时.M51
99秒倒计时.OBJ
99秒倒计时.Opt
99秒倒计时.Uv2
99秒倒计时.c
99秒倒计时.hex
99秒倒计时.plg
99秒倒计时_Opt.Bak
99秒倒计时_Uv2.Bak

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