Texas Instruments SimpleLink CC2620 Technical Reference Manual page 1500

RF Core HAL
23.3.3.1.9 CMD_SYNC_STOP_RAT: Synchronize and Stop Radio Timer Command
Command ID number: 0x0809
CMD_SYNC_STOP_RAT is a radio operation command. In addition to the parameters listed in
Table 23-8, the command structure contains the fields listed in
See Chapter 14, Real-time Clock, for more details.
AON_RTC:CTL.RTC_UPD_EN must be 1.
Byte Index Field Name
14–15
16–19 rat0
When starting, the radio CPU sets up capture of an RTC tick and waits for this tick, then stops the RAT
and calculates the value rat0. This value must be stored for use when the RAT restarts.
23.3.3.1.10 CMD_SYNC_START_RAT: Synchronously Start Radio Timer Command
Command ID number: 0x080A
CMD_SYNC_START_RAT is a radio operation command. In addition to the parameters listed in
Table 23-8, the command structure contains the fields listed in
See Chapter 14, Real-time Clock, for more details. TOP:AON_RTC:CTL.RTC_UPD_EN must be 1.
Byte Index Field Name
14–15
16–19 rat0
When starting, the radio CPU starts the RAT and sets up capture of an RTC tick and waits for this tick,
then calculates the necessary timer adjustment based on the input parameter rat0 and performs this
adjustment. The input parameter rat0 is the value previously returned by CMD_SYNC_STOP_RAT.
Because the radio timer is normally not running when this command is issued, the start trigger must be
TRIG_NOW (see Section
The first time the RAT is started after system boot, the command CMD_START_RAT must be used (see
Section 23.3.4.7). As an alternative, CMD_SYNC_START_RAT may be issued with a fixed parameter
such as 0; however, this gives an arbitrary start value for the RAT. Before powering down the radio, the
system CPU must run the CMD_SYNC_STOP_RAT command. After powering it up the radio again, the
system CPU must run the CMD_SYNC_START_RAT command with the same parameter as the one
received when CMD_SYNC_STOP_RAT was issued.
1500
Radio
Table 23-27. CMD_SYNC_STOP_RAT Command Format
Bits Bit Field Name
Table 23-28. CMD_SYNC_START_RAT Command Format
Bits Bit Field Name
23.3.2.5.1).
Copyright © 2015, Texas Instruments Incorporated
Table 23-27.
Type Description
Unused
The returned RAT value corresponding
R to the value the RAT would have had
when the RTC was zero.
Table 23-28.
Type Description
Unused
The desired RAT value corresponding to
the value the RAT would have had when
W
the RTC was zero. This parameter is
returned by CMD_SYNC_STOP_RAT.
SWCU117C – February 2015 – Revised September 2015
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