Special Function Registers (SFRs)
- Address: 0x80 – 0xFF.
- There are 21 SFRs in a standard 8051.
- SFR’s are to control specific functionality of 8051.
- SFR allows configuring and controlling peripherals.
- SFRs are accessed as if they were normal Internal RAM.
- Each SFR has an address and a name.
- SFRs are grouped in to three categories.
- IO port SFR: P0, P1, P2, P3.
- Control SFR: TCON, TMOD, SCON, IE, IP, PSW.
- Auxiliary SFR: SP, DPL, DPH, TL0, TL1, TH0, TH1, SBUF, ACC, B.
- Not all registers are bit addressable.
- Accessing undefined location results in unexpected behavior.
Related topics:
8051 Registers | 8051 Program Counter | 8051 R Registers | 8051 P Registers | 8051 Stack | 8051 Stack Pointer | 8051 Data Pointer | 8051 PCON Register | 8051 TCON Register | 8051 TMOD Register | 8051 Timer Registers | 8051 SCON Register | 8051 SBUF Register | 8051 IE Register | 8051 IP Register | 8051 PSW Register | 8051 A Register | 8051 B Register
List of topics: 8051
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