XE1205
7.2.7
OSCParam configuration register (oscillator parameters)
Name
Osc
Bits
7
Address
17
RW
r/w
Description
Sources of reference frequency
0 -> internal quartz oscillator (for XTAL or TCXO)
1 -> external signal applied on pin XTA (CMOS type signal, external clock)
Clkout
6
17
r/w
Enable clkout
0 -> no signal provided on pin CLKOUT
1 -> Signal at reference frequency divided by 2, 4, 8,16, 32 provided on
CLKOUT (19.5 MHz down to 1.22 MHz)
Clkout_freq(2:0)
5-3
17
r/w
Frequency of signal provided on CLKOUT:
000 -> 1.22 MHz
001 -> 2.44 MHz
010 -> 4.87 MHz
011 -> 9.75 MHz
others -> 19.5 MHz
RESERVED
Resxosc
2-0
7-4
17
18
r/w
r/w
RESERVED
Select the value of the resistor placed between TKA and TKB in order to
use the transceiver with a crystal operating on its third overtone
0000 -> no resistor ( 3.8 M ? )
0001 -> 1.48 k ?
0010 -> 1.56 k ?
0011 -> 1.66 k ?
0100 -> 1.78 k ?
0101 -> 1.91 k ?
0110 -> 2.07 k ?
0111 -> 2.26 k ?
1000 -> 2.55 k ?
1001 -> 2.81 k ?
1010 -> 3.22 k ?
1011 -> 3.79 k ?
1100 -> 4.65 k ?
1101 -> 6.04 k ?
1110 -> 8.79 k ?
1111 -> 16.55 k ?
304 kbit/s_filter
3
18
r/w
304.7 kbit/s Tx filter
0 -> disabled
1 -> enabled
RESERVED
2-0
18
r/w
RESERVED
Table 24: OSCParam configuration register
? Semtech 2008
34
www.semtech.com
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