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ATAM862 데이터시트(PDF) 90 Page - ATMEL Corporation

부품명 ATAM862
상세설명  Microcontroller with UHF ASK/FSK Transmitter
PDF  110 Pages
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제조업체  ATMEL [ATMEL Corporation]
홈페이지  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

ATAM862 데이터시트(HTML) 90 Page - ATMEL Corporation

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4554E–4BMCU–05/06
ATAM862-3
24.2.4
Combination Mode 9: Biphase Demodulation
SSI mode 1:
8-bit shift register internal data input (SI) and the internal shift clock
(SCI) from the Timer 3
Timer 3 mode 11:
Biphase demodulation with Timer 3
In the Biphase demodulation mode the timer works like in the Manchester demodulation mode.
The difference is that the bits are decoded with the 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 output into shift register. Before activating the demodulation the timer and the demodula-
tion stage must be synchronized with the bitstream. The Biphase code timing consists of parts
with the half bitlength and the complete bitlength. The synchronization routine must start the
demodulator after an interval with the complete bitlength.
The counter can be driven by any internal clock source and the output T3O can be used by
Timer 2 in this mode.
Figure 24-11. Biphase Demodulation
01
1
1
1
01
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Synchronize
Biphase demodulation mode
Timer 3
mode
T3EX
Q1=SI
CM31=SCI
SR-DATA
00
0
0
T3I
Reset
Counter 3
101
0
1
0
Bit 0



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