AT32UC3L064_11 ATMEL [ATMEL Corporation], AT32UC3L064_11 Datasheet - Page 19

• Manufacturer Part Number: AT32UC3L064_11
• Description: 32-bit Atmel AVR Microcontroller
• Manufacturer: ATMEL [ATMEL Corporation]

4.3
32099HS–12/2011
The AVR32UC CPU
single cycle. Load and store instructions have several different formats in order to reduce code
size and speed up execution.
The register file is organized as sixteen 32-bit registers and includes the Program Counter, the
Link Register, and the Stack Pointer. In addition, register R12 is designed to hold return values
from function calls and is used implicitly by some instructions.
The AVR32UC CPU targets low- and medium-performance applications, and provides an
advanced On-Chip Debug (OCD) system, no caches, and a Memory Protection Unit (MPU).
Java acceleration hardware is not implemented.
AVR32UC provides three memory interfaces, one High Speed Bus master for instruction fetch,
one High Speed Bus master for data access, and one High Speed Bus slave interface allowing
other bus masters to access data RAMs internal to the CPU. Keeping data RAMs internal to the
CPU allows fast access to the RAMs, reduces latency, and guarantees deterministic timing.
Also, power consumption is reduced by not needing a full High Speed Bus access for memory
accesses. A dedicated data RAM interface is provided for communicating with the internal data
RAMs.
A local bus interface is provided for connecting the CPU to device-specific high-speed systems,
such as floating-point units and I/O controller ports. This local bus has to be enabled by writing a
one to the LOCEN bit in the CPUCR system register. The local bus is able to transfer data
between the CPU and the local bus slave in a single clock cycle. The local bus has a dedicated
memory range allocated to it, and data transfers are performed using regular load and store
instructions. Details on which devices that are mapped into the local bus space is given in the
CPU Local Bus section in the Memories chapter.
Figure 4-1 on page 20
displays the contents of AVR32UC.
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