8086-Registers.ppt - General Purpose Registers 15 Data...

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General Purpose Registers 15 8 7 0 AX BX CX DX AH AL BH BL CH CL DH DL Accumulator Base Counter Data SP BP SI DI Data Group Pointer and Index Group Stack Pointer Base Pointer Source Index Destination Index
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General Purpose Registers General Purpose registers can be used to store 8- bit or 16-bit data during program execution. In addition each register has the following function: AX/AL: It is used as a accumulator. It is used in the multiply,divide, and input/output operations, and in some decimal and ASCII adjustment instructions. BX: It holds the offset address of a location in the memory. It is also used to refer to the data in the memory using the look-up table technique, with the help of the XLAT instruction.
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General Purpose Registers CX/CL: CX is used to hold the count value while executing the repeated string instruction and the LOOP instruction. (REP/REPE/REPNE). CL- Used to hold the count value while executing the shift/rotate instructions.
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