Texas Instruments SimpleLink CC2620 Technical Reference Manual page 541

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Methods for changing power mode:
• Leaving Voltage Off or Power Off can only be done from the system power management. Voltage Off
is like initial power on. Power Off requires a restore of retention, and internal sequencers must power
up and configure the bank and charge pump.
• Leaving Deep Standby can start from the following:
– PRCM
– By writing a register in the MMR
– By starting a read access to the flash
• Switching between Idle Reading and Reading is done automatically when a read has ended. The
switching can be disabled by a register setting.
• Switching from Idle Reading to any other mode is done by setting up a register with the target power
mode. After some time without read accesses, the module enters or prepares the selected mode. The
last step to achieve Power Off or Voltage Off is done by the system power management.
Power Off:
logical mode,
ready for
retention
Retention mode by PRCM
Power Off (retention mode)
RESETVDDSZ asserted
VDD off to bank/pump.
Voltage off by PRCM
Voltage Off,
reset asserted
SWCU117C – February 2015 – Revised September 2015
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Flash_off_req_l = 1
Flash_off_req_l = 0
Block Flash:
Warm Reset
access during
oscillator
source change
Oscillator Requirements
None/uncalibrated Holes allowed
Figure 7-9. Flash Power States
Copyright © 2015, Texas Instruments Incorporated
Flash Active
Read
No Read
Flash Idle
MMR Block
Pump/Bank Grace
Read
Period
Deep Standby:
this mode is entered after
a programmed idle mode
timeout,
auto return to idle when reading
Calibrated 48 MHz
Versatile Instruction Memory System (VIMS)
Power Management Requirements
Current Consumption
mA
µA
nA
541