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Functional Overview

1.3.7 System Control and Clock

System control determines the overall operation of the CC26xx device. System control provides

information about the CC26xx device, controls power-saving features, controls the clocking of the CC26xx

device and individual peripherals, and handles reset detection and reporting.

• Power control:

– On-chip fixed DC-DC converter and low drop-out (LDO) voltage regulators

– Handles the power-up sequencing, power-down sequencing, and control for the core digital-logic

and analog circuits

– Low-power options for the CC26xx microcontroller

– Low-power options for on-chip modules:

• Software controls shutdown of individual peripherals and memory

• 20KB of RAM and configuration registers are retained in all power modes

– Control-pin option for control of external DC-DC regulator

– Configurable wakeup from sleep timer or any GPIO interrupt

– Voltage supervision circuitry

• Multiple clock sources for microcontroller system clock:

– RC oscillator (HSRCOSC):

• On-chip resource providing a 48-MHz frequency

• The 24-MHz crystal oscillator (HSXOSC) is a frequency-accurate clock source from an external

crystal connected across the X24M_P input and X24M_N output pins.

• The internal 32-kHz RC oscillator is an on-chip resource providing a 32-kHz frequency, used

during power-saving modes and for RTC.

• The 32.768-kHz crystal oscillator is a frequency-accurate clock source from an external crystal

connected across the X32K_Q1 input and X32K_Q2 output pins

• Ideal for accurate RTC operation or synchronous network timing

• An external 32.768-kHz clock signal can be supplied by using one of the DIO pins as clock

input.

– CPU and periphery clock division options

1.3.8 Serial Communications Peripherals

The CC26xx device supports both asynchronous and synchronous serial communications including:

• UART

• I

• I2S

• SSI (SPI)

The following sections provide more detail on each of the communications functions.

SWCU117A–February 2015–Revised March 2015 Architectural Overview

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