T48C862-R3 datasheet(61/107 Pages) ATMEL

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T48C862-R3

4554A–4BMCU–02/03

Timer 3 – Mode 12:

Timer/Counter with External

Capture Mode (T3I)

The counter is driven by an internal clock source and an edge at the external input T3I

loads the counter value into the capture register. The edge can be selected with the pro-

grammable edge detector of the timer input stage. This mode can be used for signal and

pulse measurements.

Figure 61. External Capture Mode

Timer 3 Modulator for

Carrier Frequency Burst

Modulation

If the output stage operates as pulse-width modulator for the shift register, the output

can be stopped with stage 1 of Timer 2. For this task, the timer mode 3 must be used

and the prescaler must be supplied by the internal shift clock of the shift register.

The modulator can be started with the start of the shift register (SIR = 0) and stopped

either by a shift register stop (SIR = 1) or compare match event of stage 1 of Timer 2.

For this task, the Timer 2 must be used in mode 3 and the prescaler stage must be sup-

plied by the internal shift clock of the shift register.

Figure 62. Modulator 3

Timer 3 Demodulator for

Biphase, Manchester and

Pulse-width-modulated

Signals

The demodulator stage of Timer 3 can be used to decode Biphase, Manchester and

pulse-width-coded signals.

Figure 63. Timer 3 Demodulator 3

01 2 3456789 1011

Counter 3

T3CP-

T3I

T3R

Capture value = X

Capture value = 17

Capture

value = 35

121314 16

171819

21 23

242526

28 30

313233

35 37

383940

Set

Res

T3O

T3TOP

OMSK

TOG3

SSI/

Control

MUX

T3M

Timer 3 Mode

T3O

6 MUX 1

7 MUX 2

9 MUX 3

other MUX 0

Demodulator 3

T3EX

Res

CM31

Counter 3

Reset

Counter 3

Control

SCI

T3I

T3M

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