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430指令周期的疑问

Other Parts Discussed in Thread: MSP430F4152

想请教专家:430用户手册中提到430的指令周期与指令格式及寻址方式有关,为什么msp430f4152的数据表里说具有125ns的指令周期,这应该如何理解?还有一个问题,执行一条nop指令可以延时多长时间(时钟周期?);最后,用msp430f4152的IO口模拟I2C总线时序除了单片机和目标芯片对时间的的要求外,还应该注意什么问题?谢谢!新手