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c6748 64位定时器

您好,用startware的定时器例程(64位模式),设置LSB与MSB定时周期并触发中断,发现一个计数周期内会进入两次中断,比如LSB = 0x0D970100(1s),MSB = 1,会在1s先进入一次中断,然后18s再进入一次中断,以此往复,请问我想利用定时器直接20s触发一个中断怎么设置,谢谢。