The C51 Compiler provides a number of include files that contain
sfr, sfr16, and sbit definitions for the special function registers
of various 8051 devices. These files are found in the
\KEIL\C51\INC folder and subfolders.
Typically, SFR definition files begin with the prefix reg.
For example, the SFR definitions for the NXP 80C554 device are
defined in reg554.h.
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