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** ECX, the counter register
** EDX, the data register
* address registers
** ESI, the source register
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The lower 16 bits of each 32 bit register can be addressed seperately and like a register in its own right, and these 16 bit registers can be broken up into two eight-bit registers - that is 16 bits of data in a 16 bit register can be addressed 8 bits at a time: the upper eight and the lower eight bits, and can be treated as registers in their own right.
If we take the EAX register, this register contains 32 bits and the lower 16 bits can be addressed by the AX register. The upper 8 bits of the AX register can be addressed by the AH register and the lower 8 bits of the AX register can be addressed by the AL register.
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