The c8051f020 key procedures and lcd1602 program, pro-test is feasible.

key and 1602\keyscan.h
............\key_scan.c
............\key_scan.LST
............\key_scan.OBJ
............\key_scan.__i
............\lcd1602
............\lcd1602.c
............\lcd1602.h
............\lcd1602.lnp
............\lcd1602.LST
............\lcd1602.M51
............\lcd1602.OBJ
............\lcd1602.opt.bak
............\lcd1602.plg
............\lcd1602.Uv2.bak
............\lcd1602.uvopt
............\lcd1602.uvproj
............\lcd1602_Opt.Bak
............\lcd1602_Uv2.Bak
............\main.c
............\main.LST
............\main.OBJ
............\sysinit.h
............\sys_init.c
............\sys_init.LST
............\sys_init.OBJ
............\sys_init.__i
key and 1602

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