bittst.c

HC12DG128A的位操作指令

/*对某位的测试,返回1或0*/  
unsigned char bittst(unsigned char *addr,unsigned char num)
{unsigned char aa;
 aa=*addr;
 aa=aa>>num;//调试中返回的aa值为0x20
 aa=aa & 1;
 return(aa);
}