Data Sheet

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BDE Technology Inc.
BDE-WF3235
BDE Dual-Band WiFi MCU Module
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5.3 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