MRF24J40T-ISLASHML datasheet(30/151 Pages) MICROCHIP

30 / 151 page

MRF24J40

DS30009776E-page 30

Preliminary

 2021 Microchip Technology Inc.

TXMCR: CSMA-CA MODE CONTROL REGISTER (ADDRESS: 0x11)

R/W-0

R/W-1

R/W-0

NOCSMA

BATLIFEXT

SLOTTED

MACMINBE1 MACMINBE0

CSMABF2

CSMABF1

CSMABF0

bit 7

bit 0

Legend:

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 7

NOCSMA: No Carrier Sense Multiple Access (CSMA) Algorithm bits

1 = Disable CSMA-CA algorithm when transmitting in Unslotted mode with GTSSWITCH

(TXPEND 0x21[1]) bit set

0 = Enable CSMA-CA algorithm when transmitting in Unslotted mode with GTSSWITCH

(TXPEND 0x21[1]) bit set (default)

bit 6

BATLIFEXT: Battery Life Extension Mode bit (macBattLifeExt)

1 = Enable

0 = Disable (default)

bit 5

SLOTTED: Slotted CSMA-CA Mode bit

1 = Enable Slotted CSMA-CA mode

0 = Disable Slotted CSMA-CA mode (default)

bit 4-3

MACMINBE[1:0]: MAC Minimum Backoff Exponent bits (macMinBE)

The minimum value of the backoff exponent in the CSMA-CA algorithm. Note that if this value is set to

‘0’, collision avoidance is disabled.(1)

Default: 0x3.

bit 2-0

CSMABF[2:0]: CSMA Backoff bits (macMaxCSMABackoff)

The maximum number of backoffs the CSMA-CA algorithm will attempt before declaring a channel

access failure.(1)

111 = Undefined

110 = Undefined

101 = 5

100 = 4 (default)

011 = 3

010 = 2

001 = 1

000 = 0

Note 1: Refer to IEEE 802.15.4™-2003 Standard, Table 71 – MAC PIB attributes.

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