[BX] and loop

[BX] indicates a memory unit, and its offset address is in BX

MoV Al, [BX]

 

The description symbol () to indicate the content in a register or memory unit.

The agreed idata symbol represents a constant.

 

Loop label

When the CPU executes the loop command, there are two steps: 1. (CX) = (CX)-1; 2. judge the value in CX. If it is not zero, it is transferred to the label to continue execution, otherwise, execute the following command.

Number of cycles in CX.

 

A label represents an address.

Framework:

MoV CX, number of cycles

S: The program segment for executing the loop

Loop s