XE8806A SEMTECH [Semtech Corporation], XE8806A Datasheet - Page 82

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

14.1 Introduction
This block is a PCM Bit Stream Encoder / Decoder or RF Receiver / Transmitter Interface. In a normal
microcontroller, the bits and low level coding of the RF protocol are done by software. This is a very tedious and
CPU time consuming task since the processor has to handle bit by bit as they are received or as they have to be
transmitted. This block simplifies the handling of the low level data handling for wireless data transmission systems
very much in a similar way an UART interface does for wired transmission systems.
14.2 Features
• Two functions : Receiver and Transmitter (half duplex)
• Internal baud rate generator for all the standard baud rates
• Decode / encode 3 main PCM codes (NRZ, Bi-Phase and Miller), can be bypassed
• Buffered input / output data (FIFO)
• 4 interrupt sources
• Internal or external bit synchronization
• Internal or external start sequence detection
14.3 General overview
The RF Interface block is a bit stream receiver / transmitter for wireless transmission. It can be used with XEMICS’
or third party RF transceiver circuits.
© Semtech 2006
RFIF0
RFIF1
RFIF2
RFIF3
External clock
Output Stream
Input Stream
Match
Clock
Transmission
Reception
Filter
Prescaler
Detection
Enable/Bypass
Figure 14-1 : PCM Encoder / Decoder Structure
Start
clock
clock
PCM Encoder / Decoder
Baudrate / PCM Type
Decoder
Encoder
Enable/Bypass
Enable/Bypass
PCM
PCM
Clock
14-2
Shift Register
Shift Register
FIFO
FIFO
PCM
Ctrl Sig.
Status.
Ctrl Sig.
Status.
Type
Control
data
data
Interrupts
XE8806A/XE8807A
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