Texas Instruments SimpleLink CC2620 Technical Reference Manual page 1513

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23.3.4.18 CMD_BUS_REQUEST: Request System BUS Available for RF Core
Command ID number: 0x040E
CMD_BUS_REQUEST is an immediate command that takes the parameters listed in
Byte Index Field Name
0–1 commandNo
2 bSysBusNeeded
On reception, the radio CPU sets the bus request bit towards the PRCM to 1 if bSysBusNeeded is
nonzero, or to 0 if it is zero. If bSysBusNeeded is nonzero, this indicates that the system bus stays awake
even if the system goes to deep sleep, which must be done for the RF core to run and access to the
system side for one of the following reasons:
• Any command structure, data structure, and so on, pointed to by a pointer sent to the RF core is
placed in system RAM or flash.
• The RF core must read the temperature because the TX power has a nonzero temperature coefficient.
• The RF core must read the RTC to synchronize with the RAT during CMD_SYNC_STOP_RAT or
CMD_SYNC_START_RAT.
CMD_BUS_REQUEST may be sent as a direct command. If so, bSysBusNeeded is given by the
parameter in bits 8–15 of CMDR.
The radio CPU returns Done in CMDSTA when finished.
SWCU117C – February 2015 – Revised September 2015
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Table 23-49. CMD_BUS_REQUEST Command Format
Bits Bit Field Name
Copyright © 2015, Texas Instruments Incorporated
Table
Type Description
W The command ID number
0: System bus may sleep
W
1: System bus access needed
RF Core HAL
23-49.
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Radio