AT86RF211DB-868LT Atmel, AT86RF211DB-868LT Datasheet - Page 11

• Manufacturer Part Number: AT86RF211DB-868LT
• Description: BOARD DAUGHTER AT86RF211/868MHZ
• Manufacturer: Atmel

Specifications of AT86RF211DB-868LT

• Module/board Type: Daughter Board
• For Use With/related Products: AT86RF211 @ 866MHz
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: AT86RF211-DB868107; AT86RF211DB868107; AT86RF211DB868107; AT86RF211DB868LT

Stuff Mechanism
2186A–WIRE–08/02
4. The STOP field is a predefined sequence, mandatory if variable data length mode is used. The sender must add this
The received Data (if any) is stored into WUD register and available for the microcontroller. The read of this data deactivates
the wake-up pin (as well as WAKEUP flag of STATUS register).
Warning: the first data bit received (LSB bit: WUD[0] of WUD register) is the last bit appearing on the serial interface
SDATA pin when WUD is read.
sequence after the last data bit:
- '0000' if the last bit of the message is '1'
- '1111' if the last bit of the message is '0'
This prevents from sending 0000 or 1111 in the message itself. For this reason, a stuffing mechanism has been
implemented.
In variable length mode, a stuff mechanism is used on the whole {Address + Data} field
in order to make it impossible to have a stop sequence ('0000' or '1111') into the wanted
message.
If three consecutive bits are equal, an extra opposite stuffing bit has to be inserted in the
transmitted message by the transmitter and is automatically removed by the receiver in
wake-up mode.
The stuff mechanism starts at the first bit after Header until the last bit of data. This
mechanism is NOT used for Header and Stop fields.
Example:
Note:
{Address + Data} field
00110101
01000101
10111010
01000010
10111101
0001010
1110010
110101
Even if the variable data length mode is used, the stuff mechanism can be inhibited
(using ISTU of WUC). The user must make sure that no stop sequence is contained into
Address and Data field of the wake-up message.
Emitted {Address + Data} field including stuff
00110101
010001101
101110010
010001010
101110101
00011010
111000110
110101
AT86RF211 (TRX01)
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