AT90PWM2B-16SE ATMEL [ATMEL Corporation], AT90PWM2B-16SE Datasheet - Page 216

• Manufacturer Part Number: AT90PWM2B-16SE
• Description: 8-bit Microcontroller with 8K Bytes In-System Programmable Flash
• Manufacturer: ATMEL [ATMEL Corporation]

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Internal
Manchester
Clock
Resynchronize
Internal
Manchester
Clock
Manchester
Data
Manchester
Decoder
Counter
Edge Detection
Space
Internal
Manchester
Clock
Counter
Overflow
AT90PWM2/3/2B/3B
Start Bit
Start Bit
N1
Figure 19-5. Manchester Frame error detection
Note:
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.
N1/2
Counter Overflow = MBURR[H:L]
Bit 1
N2
N2/4
N2/2
front shift
Transition outside
the detect window
Bit 2
N3
Start Bit
Start Bit
N1
Bit 1
N2
The counter reaches the counter overflow
value without reaching a manchester edge
Framing Error
Bit 2
back shift
N3
4317J–AVR–08/10