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XE1203F
sck
si
A(4)
A(3)
A(2)
A(1)
A(0)
/en
so
High impedance
D(7)
High impedance
Figure 15: Read sequence of configuration register at address 0
5.2 CONFIGURATION AND STATUS REGISTERS
The XE1203F has several operating modes and configuration parameters which can be programmed by the user
or the application. In addition, status information may be read from the circuit. Some of the operating modes, the
status information and the configuration parameters are stored in a series of internal Configuration and Status
Registers that can be accessed by the microcontroller through the 3-wire serial interface.
There are seven variable Configuration and Status Registers, as listed below in Table 9.
Name
ConfigSwitch
Description
1-bit data to switch between 2 sets of
Size
(bits)
1x1
Address
(binary format)
00000
user-predefined SWParam
Configuration Registers
RTParam
Receiver and transmitter parameters
2x8
00001 - 00010
FSParam
LO, Bitrate, Deviation
and
other
3x8
00011 - 00101
frequency parameters
SWParam
2 sets of user-predefined configuration
6x8
00110 - 01011
registers
DataOut
Status register which can be read
2x8
01100 - 01101
through the 3-wire serial interface
ADParam
Additional parameters
5x8
01110 - 10010
Pattern
Reference pattern
for
the
“pattern
4x8
10011 - 10110
recognition” feature
Table 9: Configuration and Status Registers List
All the bits that are referred to as “reserved” in this section should be set to “0” during write operations.
5.2.1 The ConfigSwitch Register
When operating the XE1203F, it might by useful to quickly switch between two pre-defined operating modes, to
save time and traffic on the 3-wire serial interface bus. This may occur when the XE1203F is required to switch
quickly between receive and transmit mode, when it has to operate on two different carrier frequencies, or when it
has to switch between the high linearity mode B and the high sensitivity mode A. For that purpose, the five
parameters stored in the SWParam Configuration Register are duplicated: the configuration set#1 and the
configuration set #2.
? Semtech 2008
20
www.semtech.com
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