MRF24J40MB-I Datasheet, PDF (57/156 Pages) Microchip Technology – IEEE 802.15.4™ 2.4 GHz RF Transceiver

MRF24J40
REGISTER 2-50: RFCTL: RF MODE CONTROL REGISTER (ADDRESS: 0x36)
W-0
r
bit 7
R/W-0
r
R/W-0
r
R/W-0
R/W-0
WAKECNT8 WAKECNT7
R/W-0
RFRST⁽²⁾
R/W-0
R/W-0
RFTXMODE RFRXMODE
bit 0
Legend:
R = Readable bit
-n = Value at POR
r = reserved
W = Writable bit
‘1’ = Bit is set
U = Unimplemented bit, read as ‘0’
‘0’ = Bit is cleared
x = Bit is unknown
bit 7-5
bit 4-3
bit 2
bit 1
bit 0
Reserved: Maintain as ‘0’
WAKECNT<8:7>: Wake Count bits
Main oscillator (20 MHz) start-up timer counter bits. WAKECNT is a 9-bit value. WAKECNT<6:0> bits
are located in SLPACK<6:0>. Units: Sleep clock (SLPCLK) period.⁽¹⁾ Default value: 0x00.
Recommended value: 0x05F
RFRST: RF State Machine Reset bit⁽²⁾
1 = Hold RF state machine in Reset
0 = Normal operation of RF state machine
RFTXMODE: Forces RF Control State Machine to transmit State⁽³⁾
RFRXMODE: Forces RF Control State Machine to receive State
Note 1:
2:
3:
Sleep clock (SLPCLK) period depends on the Sleep clock selection (SLPCLKSEL) RFCON7<7:6> and
Sleep clock divisor (SLPCLKDIV) SLPCON1<4:0>.
Perform RF Reset by setting RFRST = 1 and then RFRST = 0. Delay at least 192 μs after performing to
allow RF circuitry to calibrate.
Recommended sequence RFCTL = 0x06 (reset mode) then RFCTL = 0x02 (transmit mode).
© 2010 Microchip Technology Inc.
Preliminary
DS39776C-page 57