9 Detailed Description
9.1 Overview
The CC3220MODx and CC3220MODAx are Wi-Fi
®
internet-on-a chip modules that consists of an Arm
®
Cortex
®
-M4 processor with a rich set of peripherals for diverse application requirements, a Wi-Fi network
processor, and power-management subsystems.
9.2 Arm
®
Cortex
®
-M4 Processor Core Subsystem
The high-performance Arm
®
Cortex
®
-M4 processor provides a low-cost platform that meets the needs of
minimal memory implementation, reduced pin count, and low power consumption, while delivering outstanding
computational performance and exceptional system response to interrupts.
• The Cortex
®
-M4 core has low-latency interrupt processing with the following features:
– A 32-bit Arm
®
Thumb
®
instruction set optimized for embedded applications
– Handler and thread modes
– Low-latency interrupt handling by automatic processor state saving and restoration during entry and exit
– Support for ARMv6 unaligned accesses
• Nested vectored interrupt controller (NVIC) closely integrated with the processor core to achieve low-latency
interrupt processing. The NVIC includes the following features:
– Bits of priority configurable from 3 to 8
– Dynamic reprioritization of interrupts
– Priority grouping that enables selection of preempting interrupt levels and nonpreempting interrupt levels
– Support for tail-chaining and late arrival of interrupts, which enables back-to-back interrupt processing
without the overhead of state saving and restoration between interrupts
– Processor state automatically saved on interrupt entry and restored on interrupt exit with no instruction
overhead
– Wake-up interrupt controller (WIC) providing ultra-low-power sleep mode support
• Bus interfaces:
– Advanced high-performance bus (AHB-Lite) interfaces: system bus interfaces
– Bit-band support for memory and select peripheral that includes atomic bit-band write and read operations
• Low-cost debug solution featuring:
– Debug access to all memory and registers in the system, including access to memory-mapped devices,
access to internal core registers when the core is halted, and access to debug control registers even while
SYSRESETn is asserted
– Serial wire debug port (SW-DP) or serial wire JTAG debug port (SWJ-DP) debug access
– Flash patch and breakpoint (FPB) unit to implement breakpoints and code patches
9.3 Wi-Fi
®
Network Processor Subsystem
The Wi-Fi network processor subsystem includes a dedicated Arm
®
MCU to completely offload the host MCU
along with an 802.11 b/g/n radio, baseband, and MAC with a powerful crypto engine for a fast, secure WLAN
and Internet connections with 256-bit encryption. The CC3220MODx and CC3220MODAx modules support
station, AP, and Wi-Fi Direct
®
modes. The module also supports WPA2 personal and enterprise security, WPS
2.0, WPA3 personal and enterprise security. The Wi-Fi network processor includes an embedded IPv6, IPv4
TCP/IP stack.
SWRS206E – MARCH 2017 – REVISED MAY 2021
48
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