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XE1205
7.2.2
MCParam configuration register (main configuration parameters)
The detailed description of the MCParam register is given in Table 17.
Name
Bits
Address RW
Description
Chip_mode(1:0)
7-6
0
r/w
Transceiver mode:
00 -> sleep mode
01 -> receive mode
10 -> transmit mode
11 -> stand-by mode
Select_mode
5
0
r/w
Transceiver mode selection:
0 -> mode defined by MCParam_chip_mode, SW(1:0) is an output
sleep mode -> SW(1:0) = ”00”
receiver mode -> SW(1:0) = “01”
transmitter mode -> SW(1:0) = “10”
stand-by mode -> SW(1:0) = “00”
1 -> mode defined by SW(1:0) :
SW(1:0) = 00 -> sleep mode
SW(1:0) = 01 -> receive mode
SW(1:0) = 10 -> transmit mode
SW(1:0) = 11 -> stand-by mode
Buffered_mode
4
0
r/w
Enable buffered mode:
0 -> continuous mode
1 -> buffered mode
Data_unidir
3
0
r/w
Configure DATA pin
0 -> DATA is a bidirectional pin:
input in transmit, output in receive mode
1 -> DATA is an output pin:
output in receive mode, high-impedance in transmit mode
Band(1:0)
2-1
0
r/w
Frequency band:
01 -> 433 – 435 MHz
10 -> 863 – 870 MHz
11 -> 902 – 928 MHz
Freq_dev(8)
Freq_dev(7:0)
0
7-0
0
1
r/w
r/w
Frequency deviation MSB
Frequency deviation:
Δ f = int(Freq_dev(8:0)) * FSTEP
Where int(x) = integer value of the binary representation of x
Example
000000001 -> Δ f = FSTEP
111111111 -> Δ f = 511*FSTEP
all these frequency deviations are available if the data shaping filter is
disabled (please refer to Table 11 )
Knx
7
2
r/w
Konnex mode enable
0 -> default mode -> bit rate defined by MCParam_Br(6:0)
1 -> Konnex mode-> bit rate = 32.7 kbit/s
Br(6:0)
6-0
2
r/w
Bit rate
Br = 152.34e3/(int(Br) + 1)
Where int(x) = integer value of the binary representation of x.
Example:
0000001 -> Br = 76.1 kbit/s
1111111 -> Br = 1.19 kbit/s
Note: if Konnex mode is enabled, then bit rate = 32.7 kbit/s.
? Semtech 2008
29
www.semtech.com
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