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NOP Vs _nop_()?

In one of my project I am talking with MX909 Driver IC with C51 ucontroller. To initialize MX909 if I write module in Assembly language it's working fine. Once I replaced with C same module it's not working.

The only difference I can make for both assembly and C languages is NOP and _nop_() instruction. Is both instructions will take same number of machine cycles?

Thanks,
Suresh Kumar Kavula

Parents
  • What is the prize for people who get the right answer ?

    The warm, fuzzy feeling of knowing that they won't fall into the trap of expecting a delay loop in C to give an exact delay.

    Here's hoping it's not a trick question!

    Not at all. On the contrary, there's even a hint pointing in the right direction.

Reply
  • What is the prize for people who get the right answer ?

    The warm, fuzzy feeling of knowing that they won't fall into the trap of expecting a delay loop in C to give an exact delay.

    Here's hoping it's not a trick question!

    Not at all. On the contrary, there's even a hint pointing in the right direction.

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