我在C程序里添加打开看门狗的汇编操作如下:（借鉴的坛子上的DX的文章）

asm("mov al,1");
asm("mov dx,443");
asm("out dx,al");

提示:
C:\DOCUME~1\ACER\LOCALS~1\Temp\cca03804.s: Assembler messages:
C:\DOCUME~1\ACER\LOCALS~1\Temp\cca03804.s:1013: Error: operands given don't match any know
n 386 instruction
C:\DOCUME~1\ACER\LOCALS~1\Temp\cca03804.s:1017: Error: operands given don't match any know
n 386 instruction
C:\DOCUME~1\ACER\LOCALS~1\Temp\cca03804.s:1021: Error: operands given don't match any know
n 386 instruction
cc386: Internal compiler error: program as got fatal signal 1

是指操作数格式不对吗,请教各位大侠应该怎么写