MRF24XA_15 Datasheet, PDF (204/258 Pages) Microchip Technology – Low-Power, 2.4 GHz ISM-Band IEEE 802.15.4™ RF

MRF24XA
REGISTER 9-6: RXCON2 (MAC RECEIVE CONTROL 2 REGISTER)
R/C/HS-0
R/W-0
R-0
R/W-0
R/W-0
R/W-0
RXBUFFUL IDENTREJ ACKRXFP ACKTXFP AUTORPTEN AUTOACKEN
bit 7
ADDRESS: 0x16
R/W-0
R/W-0
ADPTCHEN ADPTDREN
bit 0
Legend: R = Readable bit W = Writable bit
-n = Value at POR
‘1’ = Bit is set
r = Reserved
HS = Hardware Set
U = Unimplemented bit, read as ‘0’
‘0’ = Bit is cleared
x = Bit is unknown
C = Clearable bit
bit 7-2
bit 1
bit 0
Out of scope
ADPTCHEN: Adaptive Channel Enable bit⁽¹⁾
Setting this bit enables the MAC to set the transmitting channel for the ACK packet based on the Ack-
Info field (Proprietary packet) of the received packet, rather than the CH<3:0> register bits.
1 = Adaptive Channel feature is enabled
0 = Adaptive Channel feature is disabled
ADPTDREN: Adaptive Data Rate Enable bit⁽¹⁾
Setting this bit enables the MAC to set the transmission data rate for the ACK packet based on the
AckInfo field (Proprietary packet) of the received packet, rather than the DR<2:0> register bits.
1 = Adaptive Data Rate feature is enabled
0 = Adaptive Data Rate feature is disabled
Note 1: Use this field while receiving and transmitting, and must be unmodified while RXEN or TXST is set.
TABLE 9-3: REGISTERS ASSOCIATED WITH CHANNEL SELECTION
Names
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
MACCON2
CHANNEL<3:0>
SECSUITE<3:0>
RXCON1 RXEN
NOPA RXDEC RSVLQIEN RSVRSSIEN RSVCHDREN RSVCFOEN
r
RXCON2 RXBUFFUL IDENTREJ ACKRXFP ACKTXFP AUTORPTEN AUTOACKEN ADPTCHEN ADPTDREN
Legend: r = Reserved, read as ‘0’.
9.3 RXLISTEN Operations
The air-data-rate is detected in two stages:
1. Simultaneously monitoring the presence of
2 Mbps, 500 kbps, 250 kbps modulated pream-
bles until one of these is detected with sufficient
reliability.
2. Searching for a Start Frame Delimiter that may
further distinguish between air-data-rates.
Figure 9-1 and Figure 9-2 show the order of processing
steps and decisions for the Optimal and Legacy frame
formats.
DS70005023C-page 204
Preliminary
 2015 Microchip Technology Inc.