51 SCM key value addition and subtraction, and displayed in the LCD, there are negative processing functions can be used in setting the value of instrument occasions. With PROTEUS simulation.

按键加减并显示\Last Loaded 仿真电路.DBK
..............\Text.c
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..............\仿真电路.DSN
..............\仿真电路.PWI
..............\按键加减
..............\按键加减.hex
..............\按键加减.lnp
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..............\按键加减.plg
..............\按键加减.Uv2
..............\按键加减_Opt.Bak
..............\按键加减_Uv2.Bak
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