RL78/G1H CHAPTER 18 RF TRANSCEIVER
R01UH0575EJ0120 Rev. 1.20 Page 608 of 920
Dec 22, 2016
(40) CSMA-CA start count register (CSMASTACOUNT)
This register is used to set the time of warm-up until the start of CCA when the automatic CSMA-CA
sequence is used. Set the minimum number of symbols which is greater than 144 μs. Initial value: 000EH =
15 symbols (Set value: 1H = 1 symbol)
The CSMASTACOUNT register consists of 16 bits and can be accessed (serial interface communication) in
8 bit unit.
Reset signal generation sets this register to 000EH.
Figure 18 - 53 CSMA-CA Start Count Register (CSMASTACOUNT) Format
Address:
004FH, 004EH
After reset:
000EH
R/W
Symbol 15 14 13 12 11 10 9 8
CSMASTA
COUNT
76543210
CSMASTACOUNT CCA start warm-up time
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