MRF49XA-ISLASHT datasheet(26/102 Pages) MICROCHIP

26 / 102 page

MRF49XA

DS70590C-page 26

Preliminary

EQUATION 2-2:

CFSREG: CENTER FREQUENCY VALUE SET REGISTER (POR: 0xA680)

W-1

W-0

W-1

W-0

W-1

W-0

CCB<15:12>

FREQB<11:8>

bit 15

bit 8

W-1

W-0

FREQB<7:0>

bit 7

bit 0

Legend:

r = reserved bit

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

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.

bit 11-0

FREQB<11:0>: Center Frequency Set bits

These bits set the center frequency to be used during transmit or receive. The 12-bit value (FVAL) 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).

Note 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.

F0 = 10 x FA1 x (FA0 + FVAL/4000) MHz

where:

FVAL = Decimal Value of FREQB<11:0> = 96 < FVAL < 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

FA1

FA0

433 MHz

868 MHz

915 MHz

TABLE 2-6:

FREQUENCY BAND TUNING RESOLUTION

Frequency Band (MHz)

Min. (MHz)

Max. (MHz)

Tuning Resolution (kHz)

400

430.2400

439.7575

2.5

800

860.4800

879.5150

5.0

900

900.7200

929.2725

7.5

MRF49XA-I/T датащи(PDF) 26 Page - Microchip Technology

MRF49XA-I/T датащи(HTML) 26 Page - Microchip Technology

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

датащи скачать

ссылки URL