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MSP430F2011延时程序的问题

我使用的是MSP430内部16M的晶振。但是例程都是8M的

#define CPU_CLOCK 16000000
#define delay_us(us) __delay_cycles(CPU_CLOCK/16000000*(us))
#define delay_ms(ms) __delay_cycles(CPU_CLOCK/16000*(ms))

我根据例程计算,大致觉得延时1MS是这样的感觉 但是示波器测了并不是,大家可以给我看看吗