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MRF49XA
REGISTER 2-6:
CFSREG: CENTER FREQUENCY VALUE SET REGISTER (POR: 0xA680)
W-1
W-0
W-1
W-0
W-0
W-1
W-1
W-0
bit 15
CCB<15:12>
FREQB<11:8>
bit 8
W-1
W-0
W-0
W-0
W-0
W-0
W-0
W-0
FREQB<7:0>
bit 7
Legend:
r = reserved bit
bit 0
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
bit 15-12
bit 11-0
Note 1:
CCB<15:12>: Command Code bits
The command code bits ( 1010b ) are serially sent to the microcontroller to identify the bits to be written
in the CFSREG.
FREQB<11:0>: Center Frequency Set bits
These bits set the center frequency to be used during transmit or receive. The 12-bit value (F VAL ) must
be in a decimal range of 96 to 3903. The value outside this range results in the previous value being
retained and used such that no frequency change occurs (1) .
To calculate the center frequency (F0), use Equation 2-2 and the values from Table 2-5 . The CFSREG
sets the frequency within the selected band for transmit or receive. Each band has a range of frequencies
available for changing channels or frequency hopping. The selectable frequencies for each band are given
in Table 2-6 .
EQUATION 2-2:
F 0 = 10 x FA1 x (FA0 + F VAL /4000) MHz
where:
F VAL = Decimal Value of FREQB<11:0> = 96 < F VAL < 3903
Where FA0 and FA1 are constant values as given in Table 2-5 to calculate the Center Frequency.
TABLE 2-5:
CENTER FREQUENCY VALUE
Range
433 MHz
868 MHz
915 MHz
FA1
1
2
3
FA0
43
43
30
TABLE 2-6:
FREQUENCY BAND TUNING RESOLUTION
Frequency Band (MHz)
400
800
900
DS70590C-page 26
Min. (MHz)
430.2400
860.4800
900.7200
Preliminary
Max. (MHz)
439.7575
879.5150
929.2725
Tuning Resolution (kHz)
2.5
5.0
7.5
? 2009-2011 Microchip Technology Inc.
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