User manual

...the world's most energy friendly microcontrollers
2012-04-24 - Giant Gecko Family - d0053_Rev0.96 11
www.energymicro.com
4 System Processor
0
1 2 3 4
CM 3 Core
32-bit ALU
Control Logic
Thumb & Thumb-2
Decode
Instruction Interface Data Interface
NVIC Interface
Single cycle
32-bit m ultiplier
Hardware divider
Memory Protection Unit
Quick Facts
What?
The industry leading Cortex-M3 processor
from ARM is the CPU in the EFM32GG
microcontrollers.
Why?
The ARM Cortex-M3 is designed for
exceptional short response time, high
code density, and high 32-bit throughput
while maintaining a strict cost and power
consumption budget.
How?
Combined with the ultra low energy
peripherals available in EFM32GG devices,
the Cortex-M3 processor's Harvard
architecture and 3 stage pipeline, single cycle
instructions and Thumb-2 instruction set
support, and fast interrupt handling makes it
perfect for 8- to 32-bit applications.
4.1 Introduction
The ARM Cortex-M3 32-bit RISC processor provides outstanding computational performance and
exceptional system response to interrupts while meeting low cost requirements and low power
consumption.
The ARM Cortex-M3 implemented is revision r2p1.
4.2 Features
• Harvard architecture
• Separate data and program memory buses (No memory bottleneck as in a single bus system)
• 3-stage pipeline
• Thumb-2 instruction set
• Enhanced levels of performance, energy efficiency, and code density
• Single cycle multiply and hardware divide instructions
• 32-bit multiplication in a single cycle
• Signed and unsigned divide operations between 2 and 12 cycles
• Atomic bit manipulation with bit banding
• Direct access to single bits of data
• Two 1MB bit banding regions for memory and peripherals mapping to 32MB alias regions
• Atomic operation, cannot be interrupted by other bus activities
• 1.25 DMIPS/MHz
• Memory Protection Unit
• Up to 8 protected memory regions
• 24 bits System Tick Timer for Real Timer OS
• Excellent 32-bit migration choice for 8/16 bit architecture based designs