Atmel C51 Ficha Técnica descarregar pdf (Página 22)

AT89C51RB2/RC2

4180E–8051–10/06

INC is a short (2 Bytes) and fast (12 clocks) way to manipulate the DPS bit in the

AUXR1 SFR. However, note that the INC instruction does not directly force the DPS bit

to a particular state, but simply toggles it. In simple routines, such as the block move

example, only the fact that DPS is toggled in the proper sequence matters, not its actual

value. In other words, the block move routine works the same whether DPS is '0' or '1'

on entry. Observe that without the last instruction (INC AUXR1), the routine will exit with

DPS in the opposite state.

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Atmel C51 Ficha Técnica Página 22