Note for Advanced Microprocessor - AMP by COOL Indian

Topics ( 8 )

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JUMP, LOOP, AND CALL INSTRUCTIONS

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Looping  Repeating a sequence of instructions a certain number of times is called a loop ◦ Loop action is performed by DJNZ reg, Label  The register is decremented  If it is not zero, it jumps to the target address referred to by the label  Prior to the start of loop the register is loaded with the counter for the number of repetitions  Counter can be R0 – R7 or RAM location  A loop can be repeated a maximum of 256 times 2019/3/5 2

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Looping (cont.) 2019/3/5 3

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Nested Loop  If we want to repeat an action more times than 256, we use a loop inside a loop, which is called nested loop ◦ We use multiple registers to hold the count 2019/3/5 4