User's Manual

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12
3. Microcontroller Subsystem
3.1 ARM Cortex-M4 with FPU core with embedded Flash and
SRAM
The ARM Cortex-M4 with FPU processor is the latest generation of ARM processors for
embedded systems. It provides a low-cost platform to meet the needs of MCU implementation with
a reduced pin count and low-power consumption, while delivering outstanding computational
performances and advanced responses to interrupts. The ARM Cortex-M4 with FPU 32-bit
RISC processor features exceptional code efficiency, delivering the high performance expected from
an ARM core in the memory footprint usually associated with 8- and 16-bit devices. The processor
supports a set of DSP instructions which allow efficient signal processing and complex algorithm
execution. Its single precision FPU (floating point unit) speeds up software development by using
meta-language development tools, while avoiding saturation.
3.2 Embedded Flash Memory
The ALXC2X Controller embeds 512 Kbytes of Flash memory, available for storing programs and data.
3.3 Embedded SRAM
The ALXC2X embeds 128 Kbytes of system SRAM which can be accessed (read/write) at CPU clock
speed with 0 wait states.
3.4 NRST
NRST is hardware PIN to support built-in reset simultaneously to the MCU and the Wi-Fi chip.
3.5 UART interface
The ALXC2X embeds 2 universal synchronous/asynchronous receiver transmitters (USART1 and
USART6). The UART interfaces are able to communicate at speed of up to 6.25Mbit/s. USART1
provides hardware management of the CTS and RTS signals, Smart Card mode (ISO 7816 compliant)
and SPI-like communication capability. All interfaces can be served by the DMA controller
3.6 Serial peripheral interface (SPI)
The ALXC2X features up to four SPIs in slave or master modes in full-duplex or simplex