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Module 2: The 8051 Architecture

20257m

Explain the Special Function Registers used in 8051.

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SFRs Used in 8051 (Detailed as Q117)

List with addresses and function:
ACC E0H, B F0H, PSW D0H (CY,AC,F0,RS1,RS0,OV,P), SP 81H, DPL 82H, DPH 83H, P0 80H, P1 90H, P2 A0H, P3 B0H, IE A8H (EA, ES, ET1, EX1, ET0, EX0), IP B8H, TCON 88H, TMOD 89H, TL0 8AH, TL1 8BH, TH0 8CH, TH1 8DH, SCON 98H, SBUF 99H, PCON 87H.

Bit-addressable SFRs end with 0/8H. Usage: SETB TR1, JB TF0, MOV A,P0 etc. Controls all peripherals.

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