ATAR092 datasheet(53/107 Pages) ATMEL

53 / 107 page

4535E–4BMCU–05/07

ATAR092/ATAR892

Timer 3 – Mode 11: Bi-phase Demodulation

In the Bi-phase demodulation mode, the timer operates like in Manchester demodulation mode.

The difference is that the bits are decoded via a toggle flip-flop. This flip-flop samples the edge in

the middle of the bitframe and the compare register 1 match event shifts the toggle flip-flop out-

put into shift register (see also combined mode 9).

Figure 5-33. Timer 3 – Bi-phase Demodulation

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 programmable edge

detector of the timer input stage. This mode can be used for signal and pulse measurements.

Figure 5-34. External Capture Mode

Biphase Demodulation Mode

CM31 = SCI

Q1 = SI

SR-DATA

T3EX

T3I

Timer 3

Mode

Reset

Counter 3

Synchronize

BIT 4

BIT 3

BIT 5

BIT 6

BIT 1

BIT 2

BIT 0

01234 5678 9

12 13 14 15 16 17 18

22 23 24 25 26 27 28

30 31

33 34 35 36 37 38

Capture Value = 17

Capture Value = 35

Capture Value = X

Counter 3

T3CP

T3I

T3R

ATAR092 Datasheet(PDF) 53 Page - ATMEL Corporation

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