Atmel AT32UC3A3128, Manual

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32072H–AVR32–10/2012
AT32UC3A3
1. Description
The AT32UC3A3/A4 is a complete System-On-Chip microcontroller based on the AVR32 UC
RISC processor running at frequencies up to 84MHz. AVR32 UC is a high-performance 32-bit
RISC microprocessor core, designed for cost-sensitive embedded applications, with particular
emphasis on low power consumption, high code density and high performance.
The processor implements a Memory Protection Unit (MPU) and a fast and flexible interrupt con-
troller for supporting modern operating systems and real-time operating systems. Higher
computation capabilities are achievable using a rich set of DSP instructions.
The AT32UC3A3/A4 incorporates on-chip Flash and SRAM memories for secure and fast
access. 64 KBytes of SRAM are directly coupled to the AVR32 UC for performances optimiza-
tion. Two blocks of 32 Kbytes SRAM are independently attached to the High Speed Bus Matrix,
allowing real ping-pong management.
The Peripheral Direct Memory Access Controller (PDCA) enables data transfers between
peripherals and memories without processor involvement. The PDCA drastically reduces pro-
cessing overhead when transferring continuous and large data streams.
The Power Manager improves design flexibility and security: the on-chip Brown-Out Detector
monitors the power supply, the CPU runs from the on-chip RC oscillator or from one of external
oscillator sources, a Real-Time Clock and its associated timer keeps track of the time.
The device includes two sets of three identical 16-bit Timer/Counter (TC) channels. Each chan-
nel can be independently programmed to perform frequency measurement, event counting,
interval measurement, pulse generation, delay timing and pulse width modulation. 16-bit chan-
nels are combined to operate as 32-bit channels.
The AT32UC3A3/A4 also features many communication interfaces for communication intensive
applications like UART, SPI or TWI. The USART supports different communication modes, like
SPI Mode and LIN Mode. Additionally, a flexible Synchronous Serial Controller (SSC) is avail-
able. The SSC provides easy access to serial communication protocols and audio standards like
I2S.
The AT32UC3A3/A4 includes a powerfull External Bus Interface to interface all standard mem-
ory device like SRAM, SDRAM, NAND Flash or parallel interfaces like LCD Module.
The peripheral set includes a High Speed MCI for SDIO/SD/MMC and a hardware encryption
module based on AES algorithm.
The device embeds a 10-bit ADC and a Digital Audio bistream DAC.
The Direct Memory Access controller (DMACA) allows high bandwidth data flows between high
speed peripherals (USB, External Memories, MMC, SDIO, ...) and through high speed internal
features (AES, internal memories).
The High-Speed (480MBit/s) USB 2.0 Device and Host interface supports several USB Classes
at the same time thanks to the rich Endpoint configuration. The Embedded Host interface allows
device like a USB Flash disk or a USB printer to be directly connected to the processor. This
periphal has its own dedicated DMA and is perfect for Mass Storage application.
AT32UC3A3/A4 integrates a class 2+ Nexus 2.0 On-Chip Debug (OCD) System, with non-intru-
sive real-time trace, full-speed read/write memory access in addition to basic runtime control.