Additional Reasons For End-Of-Transmit On Clear-Channel Tasks - Texas Instruments CC253x User Manual

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The task can end for all the same reasons as a normal transmit task summarized in
addition it can end for the reasons listed in
Table 25-21. Additional Reasons for End-of-Transmit on Clear-Channel Tasks
RSSI
Observed valid
PRF_TASK_CONF.TX_ON_CC_CONF
Observed CMD_STOP or Timer 2 event 2 with
PRF_TASK_CONF.STOP_CONF
RSSI
below the threshold
25.9.2.6 Timing
The timing in tasks is given in registers PRF_TX_DELAY, PRF_RETRANS_DELAY, PRF_SEARCH_TIME,
PRF_RX_TX_TIME, and PRF_TX_RX_TIME. The first two of these registers are multiplied by 2 and then
represent the number of 32-MHz samples, while the rest directly give the number of 32-MHz samples.
PRF_TX_DELAY gives the time from the end of the previous transmission in the task to the start of the
next transmission. Some examples of these delays are shown in
and TX tasks, respectively. The time from the end of a received packet to the beginning of a transmitted
packet is 130 µs in an RX task with auto ACK.
When sync search takes place, either for receiving a normal packet or for receiving ACK, a time-out can
be set up for when to give up the search. This time-out, given in 32-MHz cycles, is set up in the
PRF_SEARCH_TIME register. Setting this register to 0 disables the time-out. In case of a time-out, the task
ends for a normal sync search, or a packet is retransmitted in case of an ACK sync search.
SWRU191F – April 2009 – Revised April 2014
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Table
Condition
above the threshold with
= 1
= 01 or 11 while listening for
Copyright © 2009–2014, Texas Instruments Incorporated
25-21.
End-of-Task Cause
TASK_NOCC
TASK_NOCC
Figure 25-12
CC2541 Proprietary Mode Radio
Link Layer Engine
Table 25-20. In
Comment
and Figure 25-13 for RX
315