OMAP 5432 的I2C I2C_IRQSTATUS_RAW 寄存器的清零问题

Literature Number: SWPU249AC

program guide 的流程图下有说明：

(1) The NACK, AL, ARDY, XDR, and XRDY bits are cleared by writing 1 to each corresponding bit in the
I2Ci.I2C_IRQSTATUS_RAW register.

而I2C I2C_IRQSTATUS_RAW 寄存器的说明中有：

Writing 1 in the bit field will only set the respective field to 1, used mainly for debug

不是很明白这个状态寄存器怎么清零 对已经是1的NACK, AL, ARDY, XDR, and XRDY 写1没什么变化 

谢谢解答！