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starterware 64bit 定时器

您好 ,我使用startware 的定时器例程,可以用串口收到数据。更改高32位的值,改变不了定时器的周期。周期一直都是低32位的FFFFFFFF定时的,高位的改变不起作用。对原始startware程序除了TMR_PERIOD_MSB32改变外,其他地方均没有变化。请问这是什么原因

#define STR_LEN (13)
#define TMR_PERIOD_LSB32 (0xFFFFFFFF)
#define TMR_PERIOD_MSB32 (0x00000001)