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Module 2: The 8051 Architecture

20227m

What do you mean by general purpose registers? Explain the various flags and status register in 8051.

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General Purpose Registers & Flags/PSW in 8051

GPRs: Registers R0-R7 in 4 banks (00-07H,08-0FH,10-17H,18-1FH) selectable by RS1,RS0 (PSW.4-3). Plus Accumulator A, B, DPTR.

PSW (D0H) flags: CY (PSW.7) carry/borrow, AC (PSW.6) auxiliary carry for BCD, FO (PSW.5) user flag, RS1/RS0 (bank select), OV (PSW.2) signed overflow, P (PSW.0) parity (1 if odd parity in A).

SFRs: 21 SFRs as Q117. Categories: Ports, Timer (TMOD/TCON/THx/TLx), Serial (SCON/SBUF), Interrupt (IE/IP), Power (PCON), Control (PSW,SP,DPTR,ACC,B). Status register = PSW + SFRs.

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