XE8806A SEMTECH [Semtech Corporation], XE8806A Datasheet - Page 95

• Manufacturer Part Number: XE8806A
• Description: Ultra Low-Power Low-Voltage
• Manufacturer: SEMTECH [Semtech Corporation]

If the XE1201A is used as a transmitter only, the connections RFIF0 – RXD and RFIF1 – CLKD are not required.
The RXTX pin of the XE1201A can be permanently connected to the ground. RFIF0 and RFIF1 may remain
floating.
If the XE1201A is used as a receiver only, the connection RFIF3 – TXD is not required. The pin TXD and the pin
TXRX can be permanently connected to VDD. If the bit synchronizer in the XE1201A is not used, the connection
RFIF1 – CLKD is not required.
If the XE1201A transmitter is permanently enabled, the pin EN can be permanently connected to VDD.
This documentation shows how to set-up the data transmission between the microcontroller and the XE1201A. For
detailed information on the XE1201A functionality, external components, serial interface protocol and register set-
up, please refer to the XE1201A datasheet.
14.12.1.2 Reception mode using NRZ coding and the XE1201A bit synchronizer
The protocol of the messages received is NRZ level. The start sequence of the message is a 11010111 pattern
and the message length after the start sequence is 8 bytes. The messages are sent at a data rate of 16 kbit/s. The
following paragraphs will show how to set-up the XE1201A, how to set-up the RF interface and how to handle the
received data.
© Semtech 2006
Figure 14-8 : Configuration of the connections between the microcontroller and XE1201A
XE8000
RegRfifRxSPat
RegRfifCmd1
RegRfifCmd2
RegRfifCmd3
RegRfifRxSta
RegRfifTxSta
RegRfifRx
parallel port
RegRfifTx
RFIF0
RFIF1
RFIF2
RFIF3
MOSI
MISO
SCK
SS
14-15
[clock]
data
data
RXD
CLKD
TXD
EN
RXTX
DE
SC
SD
XE8806A/XE8807A
register A
register B
register C
XE1201
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