ATAM894 datasheet(51/97 Pages) ATMEL

51 / 97 page

4679D–4BMCU–05/05

ATAM894

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 signal 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 measurements or as event counter with

time gate (see section “Combination Mode 10”).

Figure 6-30.

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.

6.3.3.3

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 sec-

tion “Combination Mode 11”).

Timer 3 – Mode 7:

Carrier Frequency Burst Modulation Controlled by SSI Internal

Output (SO)

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 (SO) of the SSI is used to enable or disable the Timer 3 output. The SSI

should be supplied with the toggle signal of Timer 2 (see section “Combination Mode 12”).

0 01 2 3 45 6 7 8 910

Counter 3

TOG2

T3CP-

40 1

T3I

T3R

Capture value = 0

Capture value = 11

Capture

value = 4

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