# assembly timer code [ C8051F340 ] explanation [closed]

Hi my problem is that I cant understand this code when I test it on my microcontroller Si Lab [ C8051F340 ]and let it run step by step My problem is basically is when I test the program on my microcontroller ( I dont feel confortable to post the whole program ) the program counter arrives to the instruction "jnb TF0, Innere_Schleife" and stops there . I can still see my microcontroller 7segment display changing . But I dont undertand why and how the program counter just stops there and doesnt jump to the next instruction although I can still see changes on my board .

## closed as unclear what you're asking by PeterJ, Voltage Spike, Dave Tweed♦Oct 3 '17 at 12:10

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JNB,Jump if Bit Not Set, will jump to the label Innere_Schleife as long as the bit TF0 is not set.
Since Innere_Schleife is right above JNB, this is a jump to itself. It will appear as if the cpu does not step becuase it doesn't update the program counter.