Datasheet

SAM9G45 [DATASHEET]
Atmel-6438O-ATARM-SAM9G45-Datasheet_08-Dec-15
588
When the start frame delimiter is a sync pattern (ONEBIT field at 0), both command and data delimiter are
supported. If a valid sync is detected, the received character is written as RXCHR field in the US_RHR and the
RXSYNH is updated. RXCHR is set to 1 when the received character is a command, and it is set to 0 if the
received character is a data. This mechanism alleviates and simplifies the direct memory access as the character
contains its own sync field in the same register.
As the decoder is set up to be used in unipolar mode, the first bit of the frame has to be a zero-to-one transition.
32.7.3.6 Radio Interface: Manchester Encoded USART Application
This section describes low data rate RF transmission systems and their integration with a Manchester encoded
USART. These systems are based on transmitter and receiver ICs that support ASK and FSK modulation
schemes.
The goal is to perform full duplex radio transmission of characters using two different frequency carriers. See the
configuration in Figure 32-17.
Figure 32-17. Manchester Encoded Characters RF Transmission
The USART module is configured as a Manchester encoder/decoder. Looking at the downstream communication
channel, Manchester encoded characters are serially sent to the RF emitter. This may also include a user defined
preamble and a start frame delimiter. Mostly, preamble is used in the RF receiver to distinguish between a valid
data from a transmitter and signals due to noise. The Manchester stream is then modulated. See Figure 32-18 for
an example of ASK modulation scheme. When a logic one is sent to the ASK modulator, the power amplifier,
referred to as PA, is enabled and transmits an RF signal at downstream frequency. When a logic zero is
transmitted, the RF signal is turned off. If the FSK modulator is activated, two different frequencies are used to
transmit data. When a logic 1 is sent, the modulator outputs an RF signal at frequency F0 and switches to F1 if the
data sent is a 0. See Figure 32-19.
From the receiver side, another carrier frequency is used. The RF receiver performs a bit check operation
examining demodulated data stream. If a valid pattern is detected, the receiver switches to receiving mode. The
demodulated stream is sent to the Manchester decoder. Because of bit checking inside RF IC, the data transferred
to the microcontroller is reduced by a user-defined number of bits. The Manchester preamble length is to be
defined in accordance with the RF IC configuration.
LNA
VCO
RF filter
Demod
control
bi-dir
line
PA
RF filter
Mod
VCO
control
Manchester
decoder
Manchester
encoder
USART
Receiver
USART
Emitter
ASK/FSK
Upstream Receiver
ASK/FSK
downstream transmitter
Upstream
Emitter
Downstream
Receiver
Serial
Configuration
Interface
Fup frequency Carrier
Fdown frequency Carrier