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Frequency Setting Register [POR=A680h]
Bit
15
1
Bit
14
0
Bit
13
1
Bit
12
0
Bit
11
Freq11
Bit
10
Freq10
Bit
9
Freq9
Bit
8
Freq8
Bit
7
Freq7
Bit
6
Freq6
Bit
5
Freq5
Bit
4
Freq4
Bit
3
Freq3
Bit
2
Freq2
Bit
1
Freq1
Bit
0
Freq0
The Frequency Setting Register sets the exact frequency within the selected band for transmit or receive.
Each band has a range of frequencies available for channelization or frequency hopping. The selectable
frequencies for each band are:
Frequency Band
300 MHz
400 MHz
800 MHz
900 MHz
Min (MHz)
310.24
430.24
860.48
900.72
Max (MHz)
319.75
439.75
879.51
929.27
Tuning Resolution
2.5 kHz
2.5 kHz
5.0 kHz
7.5 kHz
Bit [15..12] – Command Code : These bits are the command code that is sent serially to the processor
that identifies the bits to be written to the Frequency Setting Register .
Bit [11..0] – Frequency Setting : These bits set the center frequency to be used during transmit or
receive. The value of bits[11..0] must be in the decimal range of 96 to 3903. Any value outside of this
range will cause the previous value to be kept and no frequency change will occur. To calculate the
center frequency fc, use Table 9 below and the following equation:
f c = 10 * B1 * (B0 + f VAL /4000) MHz
where f VAL = decimal value of Freq[11..0] = 96<f VAL <3903.
TABLE 9.
Range
315 MHz
433 MHz
868 MHz
916 MHz
B1
1
1
2
3
B0
31
43
43
30
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Email: info@rfm.com
Page 21 of 42
?by RF Monolithics, Inc.
TRC101 - 4/8/08
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