ATAM894 datasheet(48/97 Pages) ATMEL

48 / 97 page

4679D–4BMCU–05/05

ATAM894

A special feature of this timer is the trigger- and single-action mode. In trigger mode, the counter

starts counting triggered by the external signal at its input. In single-action mode, the counter

counts only one time up to the programmed compare match event. These modes are very useful

for modulation, demodulation, signal generation, signal measurement and phase control. For

phase control, the timer input is protected against negative voltages and has zero-cross detec-

tion capability.

Timer 3 has a modulator output stage and input functions for demodulation. As modulator it

works together with Timer 2 or the serial interface. When the shift register is used for modulation

the data shifted out of the register is encoded bit-wise. In all demodulation modes, the decoded

data bits are shifted automatically into the shift register.

Figure 6-25.

Counter 3 Stage

6.3.3.2

Timer/Counter Modes

Timer 3 has 6 timer modes and 6 modulator/demodulator modes. The mode is set via the Timer

3 Mode Register T3M.

In all these modes, the compare register and the compare-mode register belonging to it define

the counter value for a compare match and the action of a compare match. A match of the cur-

rent counter value with the content of one compare register triggers a counter reset, a Timer 3

interrupt or the toggling of the output flip-flop. The compare mode registers T3M1 and T3M2

contain the mask bits for enabling or disabling these actions.

The counter can also be enabled to execute single actions with one or both compare registers. If

this mode is set the corresponding compare match event is generated only once after the

counter starts.

8-bit comparator

Compare register 1

RES

Capture register

8-bit counter

Compare register 2

Control

C31

C32

Control

T3SM1

T3RM1

T3IM1

T3TM1

TOG2

T3I

T3TM2

T3IM2

T3RM2

T3SM2

CL3

T3EIM

TOG3

INT5

CM31

CM32

: T3M1

: T3M2

ATAM894 Datasheet(PDF) 48 Page - ATMEL Corporation

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