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AT90PWM2 Datasheet(PDF) 225 Page - ATMEL Corporation

Part # AT90PWM2
Description  8-bit Microcontroller with 8K Bytes In-System Programmable Flash
PDF  365 Pages
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Manufacturer  ATMEL [ATMEL Corporation]
Direct Link  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

AT90PWM2 Datasheet(HTML) 225 Page - ATMEL Corporation

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AT90PWM2/3
4317B–AVR–02/05
Each time bit in the Manchester serial frame is divided into two phases (See Figure
109). The counter counts during the first phase and counts down during the second one.
When the data bit transition is detected, the counter memorises the N1 counter value
and start counting down.
When the counter reachs the zero value, it starts counting up again and the N1/2 value
allows to open the next detection window. This detection window defines the time zone
where the next data bit edge is sampled.
Figure 109. Manchester Decoder operation
Start Bit
Bit 1
Bit 2
N1
N2
N3
N1/2
N2/2
N3/2
N2/2
Data Clock
Manchester
Data
Manchester
Decoder
Counter
Detection
Window
Internal
Manchester
Clock
Decoded
Data-



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