利用MSP430F149内部的硬件乘法器进行8bit-8bit，16bit-16bit的乘法，只需三个主时钟周期，即可读出运算结果。-Using MSP430F149 internal hardware multiplier for 8bit-8bit, 16bit-16bit multiplication, just three master clock cycles, you can read out the result of the operation.