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...the world's most energy friendly microcontrollers
4 System Processor
Quick Facts
What?
0 1 2 3
4
CM 3 Cor e
The industry leading Cortex-M3 processor
from ARM is the CPU in the EFM32G
microcontrollers.
Why?
The ARM Cortex-M3 is designed for
3 2 - bit ALU
exceptional short response time, high
Hardware divider
Control Logic
Instruction Interface
NVIC Interface
Single cycle
32-bit m ultiplier
Thum b & Thum b-2
Decode
Data Interface
Mem ory Protection Unit
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 EFM32G 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 r2p0.
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
2011-04-12 - d0001_Rev1.10
10
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