RL78/G1H CHAPTER 18 RF TRANSCEIVER
R01UH0575EJ0120 Rev. 1.20 Page 665 of 920
Dec 22, 2016
(3) Example of procedure for CCA
<1> Set to the IDLE state.
<2> Set the reception frequency in the frequency setting register (BBFREQ).
For details, see 18.7.2 (3) RF frequency setting for reception.
<3> Set the CCATRG bit of the transmission/reception control register (BBTXRXCON) to ”1” (CCA start).
<4> Wait for the CCA completion interrupt.
<5> Check the CCA result by the CCA bit of the transmission/reception status register 0 (BBTXRXST0).
(4) Example of procedure for CSMA-CA
<1> Set to the IDLE state.
<2> Set the reception frequency in the frequency setting register (BBFREQ).
For details, see 18.7.2 (3) RF frequency setting for reception.
<3> For the beacon mode, set the BEACON bit of the transmission/reception mode register 0
(BBTXRXMODE0) to ”1”.
<4> Set the BOFFPROD0-BOFFPROD7 bit of the back-off period register 2 (BBBOFFPROD2) to the
default value. And then, set the BOFFPRODEN bit of the back-off period register (BBBOFFPROD) to
“1” (back-off period register automatic random permission).
<5> Set the CSMAST bit of the CSMA control register 0 (BBCSMACON0) to ”1” (Automatic CSMA-CA
start). To perform transmission processing after CSMA-CA completion simultaneously, set the
CSMATRNST bit of the CSMA control register 0 (BBCSMACON0) to ”1” (transmission processing
after CSMA-CA).
<6> Wait for the CSMA-CA completion interrupt.
<7> Check the CSMA-CA result by the CSMA-CA bit of the transmission/reception status register 0
(BBTXRXST0).
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