MRF24J40_08 Datasheet, PDF (90/152 Pages) Microchip Technology – IEEE 802.15.4™ 2.4 GHz RF Transceiver

MRF24J40
3.4 Channel Selection
The MRF24J40 is capable of selecting one of sixteen
channel frequencies in the 2.4 GHz band. The desired
channel is selected by configuring the CHANNEL bits
in the RFCON0 (0x200<7:4>) register. See Table 3-4
for the RFCON0 register setting for channel number
and frequency.
Note:
Perform an RF State Machine Reset (see
Section 3.1 “Reset”) after a channel
frequency change. Then, delay at least
192 μs after the RF State Machine Reset,
to allow the RF circuitry to calibrate.
TABLE 3-4:
Channel
Number
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
CHANNEL SELECTION
RFCON0 (0x200) REGISTER
SETTING
Frequency
Set Value
2.405 GHz
2.410 GHz
2.415 GHz
2.420 GHz
2.425 GHz
2.430 GHz
2.435 GHz
2.440 GHz
2.445 GHz
2.450 GHz
2.455 GHz
2.460 GHz
2.465 GHz
2.470 GHz
2.475 GHz
2.480 GHz
0x02
0x12
0x22
0x32
0x42
0x52
0x62
0x72
0x82
0x92
0xA2
0xB2
0xC2
0xD2
0xE2
0xF2
TABLE 3-5: REGISTERS ASSOCIATED WITH CHANNEL SELECTION
Addr. Name
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
0x36 RFCTL
r
r
r
WAKECNT8 WAKECNT7 RFRST
r
r
0x200 RFCON0 CHANNEL3 CHANNEL2 CHANNEL1 CHANNEL0 RFOPT3 RFOPT2 RFOPT1 RFOPT0
DS39776B-page 88
Preliminary
© 2008 Microchip Technology Inc.