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ATAM862-8 Datasheet(PDF) 58 Page - ATMEL Corporation |
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ATAM862-8 Datasheet(HTML) 58 Page - ATMEL Corporation |
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58 / 107 page  58 ATAM862-8 4590E–4BMCU–09/04 Figure 55. Externally Triggered Counter Reset and Start Combined with Single-action Mode Timer 3 – Mode 3: Timer/Counter, Internal Trigger Restart and Internal Capture (with TOG2) The counter is driven by an internal or external (T3I) clock source. The output toggle sig- nal of Timer 2 resets the counter. The counter value before the reset is saved in the capture register. If single-action mode is activated for one or both compare registers, the trigger signal restarts the single actions. This mode can be used for frequency measure- ments or as event counter with time gate (see “Combination Mode 10: Frequency Measurement or Event Counter with Time Gate” on page 85). Figure 56. Event Counter with Time Gate Timer 3 – Mode 4: Timer/Counter The timer runs as timer/counter in mode 1, but its output T3O is used as output for the Timer 2 output signal. Timer 3 – Mode 5: Timer/Counter, External Trigger Restart and External Capture (with T3I Input) The Timer 3 runs as timer/counter in mode 2, but its output T3O is used as output for the Timer 2 output signal. Timer 3 Modulator/Demodulator Modes Timer 3 – Mode 6: Carrier Frequency Burst Modulation Controlled by Timer 2 Output Toggle Flip-Flop (M2) The Timer 3 counter is driven by an internal or external clock source. Its compare- and compare mode registers must be programmed to generate the carrier frequency via the output toggle flip-flop. The output toggle flip-flop of Timer 2 is used to enable or disable the Timer 3 output. Timer 2 can be driven by the toggle output signal of Timer 3 or any other clock source (see “Combination Mode 11: Burst Modulation 1” on page 86). 00000000123456 Counter 3 T3EX CM31 CM32 78 9 10 0 1 2 X X X 0 1 2 3 4 5678 9 10 01 2 X X T3R XX T3O 001 2 34567 8 9 10 Counter 3 TOG2 T3CP- Register 11 0 1 2 40 1 T3I 2 3 T3R Capture value = 0 Capture value = 11 Capture value = 4 |
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