Clock Management - Texas Instruments SimpleLink CC2620 Technical Reference Manual

Introduction
6.1.3.1 MCU_VD
Figure 6-3 shows that the MCU voltage domain contains the CPU system divided into multiple power
domains. MCU_VD also includes always-on logic not encapsulated in a power domain, which is powered
whenever MCU_VD is powered. This in
MCU_VD is powered up by any enabled wake-up source.
Requirements to power off MCU_VD are found in the register description of PRCM:VDCTL.MCU_VD (see
Section 6.2.4.4, VDCTL Register (Offset = Ch) [reset = X].
6.1.3.1.1 MCU_VD Power Domains
Figure 6-2 shows control of MCU_VD power domains and provides descriptions of the registers.
6.1.3.2 AON_VD
AON_VD contains two power domains and always-on logic marked AON in
Logic in AON is always powered when the CC26xx and CC13xx devices are not in shutdown mode.
6.1.3.2.1 AON_VD Power Domains
Figure 6-2 shows control of AON_VD power domains and provides descriptions of the registers.

6.1.4 Clock Management

6.1.4.1 System Clocks
Figure 6-4 and Table 6-4
system clocks can be derived from several sources.
24 MHz
32.768 kHz
External
32 kHz
418
Power, Reset, and Clock Management
Figure 6-3
show that the CC26xx and CC13xx devices have a flexible clock mux where
Figure 6-4. Clock Sources
HF XTAL
oscillator
LF XTAL
oscillator
HF RC
oscillator
LF RC
oscillator
AON
I/O controller
Copyright © 2015, Texas Instruments Incorporated
shows this logic as MCU_AON.
Figure
32.25 kHz
/ 768
24 MHz
48 MHz
x 2
32.768 kHz
Clock mux
48 MHz
24 MHz
/ 2
32 kHz
32 kHz
SWCU117C – February 2015 – Revised September 2015
www.ti.com
6-3.
SCLK_LF
SCLK_HF
SCLK_LF_AUX
ACLK_ADC
ACLK_REF
ACLK_TDC
Submit Documentation Feedback