I wrote it myself 51 microcontroller timer interrupt program, easy to use, write specific time way inside, this is written using keil, very easy to understand and relatively easy to use

定时中断
........\STARTUP.A51
........\STARTUP.LST
........\STARTUP.OBJ
........\STC12C5A.H
........\main
........\main.LST
........\main.M51
........\main.OBJ
........\main.Opt
........\main.Uv2
........\main.c
........\main.hex
........\main.lnp
........\main.plg
........\main_Opt.Bak
........\main_Uv2.Bak

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