ATAM862-3_07 Datasheet, PDF (65/110 Pages) ATMEL Corporation – Microcontroller with UHF ASK/FSK Transmitter

ATAM862-3
23.3.6
Timer 3 – Mode 11: Biphase Demodulation
In the Biphase 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 “Combination Mode 9: Biphase Demodulation” on page 90).
Figure 23-11. Biphase Demodulation
Timer 3
mode
Synchronize
Biphase demodulation mode
T3I
0
0
1
1
0
1
0
1
0
T3EX
Q1 = SI
CM31= SCI
Reset
Counter 3
SR-DATA
0
Bit 7
1
Bit 6
1
Bit 5
0
Bit 4
1
Bit 3
0
Bit 2
1
Bit 1
0
Bit 0
23.3.7
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 23-12. External Capture Mode
T3R
T3I
Counter 3
T3CP-
Register
0 0 1 2 3 4 5 6 7 8 9 1011121314151617181920212223242526272829303132333435363738394041
Capture value = X
Capture value = 17
Capture
value = 35
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4554F–4BMCU–07/07