System Control And Clock - Texas Instruments SimpleLink CC2620 Technical Reference Manual

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1.3.7 System Control and Clock

System control determines the overall operation of the CC26xx and CC13xx devices. System control
provides information about the CC26xx and CC13xx devices, controls power-saving features, controls the
clocking of the CC26xx and CC13xx devices 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 wake up 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 Communication Peripherals
The CC26xx and CC13xx devices support both asynchronous and synchronous serial communication
including:
• UART
2
• I C
• I2S
• SSI (SPI)
The following subsections provide more detail on each of the communication functions.
SWCU117C – February 2015 – Revised September 2015
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Architectural Overview