AT90PWM2B-16SU View Datasheet(PDF) - Atmel Corporation

Part Name

Description

Manufacturer

AT90PWM2B-16SU

8-bit Atmel Microcontroller with 8K Bytes In-System Programmable Flash

Atmel Corporation 

Figure 19-5. Manchester Frame error detection

AT90PWM2/3/2B/3B

Internal

Manchester

Clock

Resynchronize

Internal

Manchester

Clock

Start Bit

Bit 1

Bit 2

Start Bit

Bit 1

Bit 2

Manchester

Data

front shift

Counter

Overflow

Manchester

Decoder

Counter

Start Bit

N1

N3

N2

N1/2

N2/2

N2/4

Edge Detection

Space

Internal

Manchester

Clock

Transition outside

the detect window

Start Bit

N1

back shift

Framing Error

N3

N2

The counter reaches the counter overflow

value without reaching a manchester edge

Note: Counter Overflow = MBURR[H:L]

When a Manchester framing error is detected the FEM bit and RxC bit are set at the same time.

This allows the application to execute the reception complete interrupt subroute when this error

conditon is detected.

When a Manchester framing error is detected, the EUSART receiver immediately enters in a

new start bit detection phase. Thus when a Manchester framing error is detected within a frame,

the receiver will process the rest of the frame as a new incomming frame and generate other

FEM errors.

4317K–AVR–03/2013

217

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