Renesas RL78/G1H, User Manual

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RL78/G1H CHAPTER 18 RF TRANSCEIVER
R01UH0575EJ0120 Rev. 1.20 Page 602 of 920
Dec 22, 2016
(34) ACK counter initial value register (ACKINI)
This register is used to set each of the timings upon automatic ACK reply mode.
The ACKINI register consists of 16 bits and can be accessed (serial interface communication) in 8 bit unit.
Reset signal generation clears this register to 0000H.
Figure 18 - 44 ACK Counter Initial Value Register (ACKINI) Format
(Setting example) In the BEACON mode
The ACK counter compare 0 register, ACK counter compare 1 register, ACK counter initial value register,
and back off cycle setting register are used to control the ACK reply timing in the BEACON mode.
ACK counter compare 0 register: Set the time subtracted 300
μ
s from the back off cycle.
Initial value: 0014H = 20 symbols (Set value: 1H = 1 symbol)
ACK counter compare 1 register: Set the time subtracted 144
μ
s from the back off cycle.
Initial value: 000EH = 15 symbols (Set value: 1H = 1 symbol)
ACK counter initial value register: Set the time until the baseband block recognizes the receive start.
Total time of preamble plus SFD plus FL.
Initial value: 0000H = 0 symbols (Set value: 1H = 1 symbol)
Figure 18 - 45 Count Operation in the BEACON Mode
Address: 005FH, 005EH After reset: 0000H R/W
Symbol 15 14 13 12 11 10 9 8
ACKINI
7 6 5 4 3 2 1 0
ACKINI ACK counter initial value
TX RX
1130 μs
Setting value of the ACK counter initial value register
Setting value of the back off period frequency setting register
Setting value of the ACK counter
compare 0 register Setting value of the ACK counter
compare 1 register
Communication
status
Counter value
TRG_ON
300 μs
280 μs 280 μs 280 μs
300 μs 300 μs
1130 μs 1130 μs