AT90PWM2 datasheet(223/365 Pages) ATMEL

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AT90PWM2/3

4317B–AVR–02/05

Manchester encoding

Manchester encoding (also know as Biphase Code) is a synchronous clock encoding

technique used to encode the clock and data of a synchronous bit stream. In this tech-

nique, the actual binary data to be transmitted are not sent as a sequence of logic 1's

and 0's as in level encoded way as in standard USART (known technically as Non

Return to Zero (NRZ)). Instead, the bits are translated into a slightly different format that

has a number of advantages over using straight binary encoding (i.e. NRZ).

Manchester encoding follows the rules:

•

If the original data is a Logic 1, the Manchester code is: 0 to 1 (upward transition at

bit center)

•

If the original data is a Logic 0, the Manchester code is: 1 to 0 (downward transition

at bit center)

Figure 107. Manchester Bi-phase levels

Manchester frame

The USART supports Manchester encoded frames with the following characteristics:

•

One start bit Manchester encoded (logical ‘1’)

•

5, 6, 7, 8, 9, 13, 14,15,16,17 data bits in transmission or reception (MSB or LSB

first)

•

The number of data bit in a frame is independently configurable in reception and

transmission mode.

•

One or Two stop bits (level encoded)

Figure 108. Manchester Frame example

Logical 0

Logical 1

Start

Bit

Data Bits

(up to 17 data bit)

Stop

Bits

Encoder Clock

Manchester Data

Binary Data

AT90PWM2 Datasheet(PDF) 223 Page - ATMEL Corporation

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