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masp430f169 硬件乘法器读取不能读取结果寄存器吗?



unsigned int result1,result0;

RESLO=0;
RESHI=0; //清空结果寄存器
MPY=0XFF;
OP2=0XFF;
_NOP();
_NOP();
result0=RESLO;
result1=RESHI;

当op2写完后,下个时钟结果寄存器就有值了,但是为什么不能读结果寄存器的值呢?

手册上说的的RESLO和RESHI;是可读可写。