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why does LDR takes two cycle to be executed

Haohao

Hello everyone,

I am currently working on a cortex-M0 microprocessor(LPC1114). I have looked through all the possible instruction descriptions but I did not find anyone of them explaining why some instructions takes two cycle to execute.

For example, ANDS, MOVS takes only one cycle to execute. but why do we need two cycles to execute LDR? and STR? 

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