mul.h

P18F4610的有符号16*16运算C结合汇编．很好的学习例子．MCC18编译器．

//乘法变量定义区B
signed long int mul_sign_16(signed int nmb1_s,signed int nmb2_s);
unsigned long  int mul_unsign_16(unsigned int nmb1_u,unsigned int nmb2_u);
 
#pragma udata access SULTOR=0x008
near union
       {
         unsigned int SULTOR_U;
         signed int SULTOR_S;
       }SULTOR;
#pragma udata

#pragma udata access SULND=0x00a
near union
       {
         unsigned int SULND_U;
         signed int SULND_S;
       }SULND;
#pragma udata

#pragma udata access MUL_RESULT=0x004
signed long int near  MUL_RESULT;
#pragma udata
//乘法变量定义区E