我用keil 编译时包含的头文件总是包含不进去是怎么回事?该任何设置?如:#include <AT89x051.H>,出错提示是:Build target 'Target 1' compiling t12.c... *** WARNING C318 IN LINE 1 OF t12.c: can't open file 'AT89x051.H' T12.C(27): error C202: 'TMOD': undefined identifier T12.C(28): error C202: 'TH0': undefined identifier T12.C(29): error C202: 'TL0': undefined identifier T12.C(30): error C202: 'IE': undefined identifier T12.C(36): error C202: 'P3_0': undefined identifier |