IAR-C有著強大的軟件仿真功能，但其中的寄存器位操作定義卻十分煩瑣，并且編譯后生成的ASM代碼冗余較多，針對該問題，版主自已定義一個位操作定義的方法，初學者可參考定義，并且該種方法可應用于所有寄存器位操作定義。 共實現置位--Set_Bit， 清位--Clr_Bit，取反位Com_Bit，測試位Test_Bit四種位操作功能，并且每條位操作定義僅需一條3字節的ASM指令序列即可，簡便直接。 //***************************************************** //P00位操作定義 #define Set_P00 (P0 = P0 | 0x1) #define Clr_P00 (P0 = P0 & ~0x1) #define Com_P00 (P0 = P0 ^ 0x1) #define Test_P00 (P0 & 0x1) //P01位操作定義 #define Set_P01 (P0 = P0 | 0x2) #define Clr_P01 (P0 = P0 & ~0x2) #define Com_P01 (P0 = P0 ^ 0x2) #define Test_P01 (P0 & 0x2) //P02位操作定義 #define Set_P02 (P0 = P0 | 0x4) #define Clr_P02 (P0 = P0 & ~0x4) #define Com_P02 (P0 = P0 ^ 0x4) #define Test_P02 (P0 & 0x4) //P03位操作定義 #define Set_P03 (P0 = P0 | 0x8) #define Clr_P03 (P0 = P0 & ~0x8) #define Com_P03 (P0 = P0 ^ 0x8) #define Test_P03 (P0 & 0x8) //P04位操作定義 #define Set_P04 (P0 = P0 | 0x10) #define Clr_P04 (P0 = P0 & ~0x10) #define Com_P04 (P0 = P0 ^ 0x10) #define Test_P04 (P0 & 0x10) //P05位操作定義 #define Set_P05 (P0 = P0 | 0x20) #define Clr_P05 (P0 = P0 & ~0x20) #define Com_P05 (P0 = P0 ^ 0x20) #define Test_P05 (P0 & 0x20) //P06位操作定義 #define Set_P06 (P0 = P0 | 0x40) #define Clr_P06 (P0 = P0 & ~0x40) #define Com_P06 (P0 = P0 ^ 0x40) #define Test_P06 (P0 & 0x40) //P07位操作定義 #define Set_P07 (P0 = P0 | 0x80) #define Clr_P07 (P0 = P0 & ~0x80) #define Com_P07 (P0 = P0 ^ 0x80) #define Test_P07 (P0 & 0x80) //************************************* //P1端口操作位定義 //P10位操作定義 #define Set_P10 (P1 = P1 | 0x1) #define Clr_P10 (P1 = P1 & ~0x1) #define Com_P10 (P1 = P1 ^ 0x1) #define Test_P10 (P1 & 0x1)