RL78/G1H CHAPTER 18 RF TRANSCEIVER
R01UH0575EJ0120 Rev. 1.20 Page 584 of 920
Dec 22, 2016
(17) CSMA control register 2 (BBCSMACON2)
This register controls the CSMA-CA operation.
The BEMAX bit is used to set the macMaxBE value. (Initial value is 5
H) Set the greater value for the
BEMAX bit than the BEMIN bit setting value.
The MacMinBE control bit can be used to set with/without the CCA operation when “000b” is set to
macMinBE which is a parameter of automatic CSMA-CA.
The unicast frame enable bit can be used to set the operation by the unicast frame bit.
The BBCSMACON2 register consists of 8 bits and can be accessed (serial interface communication) in 8 bit
unit.
Reset signal generation sets this register to 05H.
Figure 18 - 23 CSMA Control Register 2 (BBCSMACON2) Format
Caution Be sure to clear bits 6 and 7 to “0”.
Address:
0013H
After reset: 05H R/W
Symbol76543210
BBCSMA
CON2
0 0 UNICASTFR
MEN
MACMINBEC
ON
BEMAX3 BEMAX2 BEMAX1 BEMAX0
UNICASTFR
MEN
Unicast frame enable bit
0 Unicast frame disabled
1 Unicast frame enabled
MACMINBE
CON
MacMinBE control bit
0 Without the CCA operation
1 With the CCA operation
BEMAX[3:0] MacMaxBE value
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