C251 User's Guide

SFR Memory

The 251 provides 128 bytes of memory for Special Function Registers (SFRs). SFRs are bit, byte, or word-sized registers that are used to control timers, counters, serial I/O, port I/O, and peripherals. Refer to Special Function Registers for more information.

Note

  • SFR memory may be accessed directly using the MOV instruction. It may not be accessed indirectly.