FIGURE 4–1 A 3-bit timer. (a) Schematic. (b) Timing...

The 8051 Microcontroller, 4e

By I. Scott MacKenzie and Raphael C.-W. Phan

© 2007 Pearson Education, Inc.

Pearson Prentice Hall

Upper Saddle River, NJ 07458

FIGURE 4–1 A 3-bit timer. (a) Schematic. (b) Timing diagram.






FIGURE 4–2 Timer modes (a) Mode 0 (b) Mode 1 (c) Mode 2 (d) Mode 3






FIGURE 4–3 Clocking source






FIGURE 4–4 Starting and stopping the timers






FIGURE 4–5 Timer 1 operating in mode 1






FIGURE 4–6 Waveform for example






FIGURE 4–7 Buzzer example






FIGURE 4–8 Timer 2 in 16-bit auto-reload mode






FIGURE 4–9 Timer 2 in 16-bit capture mode






FIGURE 4–10 Timing for modified buzzer example






FIGURE 4–11 Turnstile problem






FIGURE 4–12 Loudspeaker interface






FIGURE 4–13 60 Hz time base

FIGURE 4–1 A 3-bit timer. (a) Schematic. (b) Timing...

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