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MSP430G2553: 使用看门狗定时器,为何开始中断时长不对?

Part Number: MSP430G2553


使用MSP430G2553的launchpad测试看门狗定时模式,时钟为内部1M时钟,看门狗定时时长为8ms。在看门狗中断服务程序中将指定IO引脚(初始输出高电平)翻转,查看波形发现开始的中断间隔不是8ms,而是4ms,之后的中段间隔就是正确的8ms了,请问这是为什么呢?