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Module 2: The 8051 Architecture

20217m

List the special function register associated with
(i) Interrupts
(ii) I/O ports
(iii) Timers/Counters

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SFRs for Interrupts, I/O, Timers

  • Interrupts: IE A8H (enable: EA,ES,ET1,EX1,ET0,EX0), IP B8H (priority: PS,PT1,PX1,PT0,PX0), TCON 88H (flags IE1/IE0, IT1/IT0, TF1/TR1,TF0/TR0), SCON 98H (TI/RI for serial interrupt).
  • I/O Ports: P0 80H, P1 90H, P2 A0H, P3 B0H – latches + alternate control via SCON/TCON.
  • Timers/Counters: TMOD 89H (mode/GATE/C/T/M1M0 for both), TCON 88H (TF/TR/IE/IT), TH0/TL0 8CH/8AH, TH1/TL1 8DH/8BH, PCON 87H (T2 extra in 8052: T2CON etc.).

Set via MOV IE,#... ; MOV TMOD,#... ; MOV P1,#... etc.

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