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Module 4: Memory and I/O Interfacing

20237m

Write short notes on: Counters

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Short Notes: Counters (8051)

  • Timers configured as counters when C/T=1 in TMOD count pulses on T0 (P3.4)/T1(P3.5) falling edge.
  • 16-bit count up; overflow TFx→interrupt.
  • Modes as timers: 13/16/8-bit auto-reload/split.
  • Used to count external events: pulse counting, frequency measure.
  • Example: TMOD=06H (T1 counter mode2) counts external.

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