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Introduction

Table 6-6. Example Sequence for Setting CC26xx in Standby Mode (continued)

Description

Register

Required step

Set the LF clocks to correct source

[DDI_0_OSC:CTL0.SCLK_LF_SRC_SEL]

Yes

Configure recharge interval

[AON_WUC:RECHARGECFG]

Yes

Configure one or more wake-up

[AON_EVENT:MCUWUSEL]

Yes

sources for MCU

Configure power-down clock for

[AON_WUC:MCUCLK.PWR_DWN:SRC]

No (Default: No clock)

MCU

Configure power-down clock for

[AON_WUC:AUXCLK.PWR_DWN:SRC]

No (Default: No clock)

AUX

Configure system SRAM retention

[AON_WUC:MCUCFG.SRAM_RET_EN]

No (Default: Retention enabled)

Turn off JTAG

[AON_WUC:JTAGCFG:JTAG_PD_FORCE_

Yes

ON]

Configure the wake-up source to

IOC:IOCFG / AON_RTC / AUX

Yes

generate an event

Request AUX_PD power down

[AUX_WUC:PWRDWNREQ.REQ]

Yes

Disconnect AUX from system bus

[AUX_WUC:MCUBUSCTL.DISCONNECT_R Yes
EQ]

Latch I/O state

[AON_IOC:IOCLATCH.EN]

Yes

Turn off power domains and verify

[PRCM.PDCTL0]

Yes

they are turned off

[PRCM.PDCTL1]
[PRCM.PDSTAT0]
[PRCM.PDSTAT1]

Request digital supply to be Micro

[PRCM:VDCTL:ULDO]

Yes

LDO

Synchronize transactions to AON

[AON_RTC.SYNC.WBUSY]

Yes (Read register)

domain

Set the system CPU SLEEPDEEP

[CPU_SCS:SCR.SLEEPDEEP]

Yes

bit

Stop the system CPU to start the

WFI or WFE

Yes

power-down sequence

6.1.5.5

Shutdown Mode

Shutdown mode is defined as having no active power regulator in the CC26xx device.

Before putting the CC26xx device in shutdown mode, I/O pins are latched to keep their output values in
shutdown. This is the only difference between holding the CC26xx device in reset with the reset pin and
shutdown mode.

Only an enabled pin interrupt or reset pin can wake up the CC26xx device from shutdown mode (see ).

Table 6-7. Example Sequence for Going to Shut Down

Description

Register

Required step

Enable shutdown and latch I/Os

[AON_WUC:SHUTDOWN.EN]

Yes

Turn off JTAG

[AON_WUC:JTAGCFG:JTAG_PD_FORCE_ON]

Yes

Configure the wake-up pin

IOC:IOCFGxx:WU_CFG

Yes

Request AUX power down

[AUX_WUC:PWRDWNREQ.REQ]

Yes

Disconnect AUX from system bus

[AUX_WUC:MCUBUSCTL.DISCONNECT_REQ]

Yes

Request MCU_VD power off

[PRCM:VDCTL.MCU_VD]

Yes

Synchronize transactions to AON

[AON_RTC.SYNC]