Atmel | SMARTarmtechforum.com.cn/2014/bj/B-7_Atmel.pdf · 30 © 2014 Atmel Confidential Offloading...

1 © 2014 Atmel Confidential1

2014 ARM Tech Symposia

Atmel | SMARTThink Beyond the Core

2 © 2014 Atmel Confidential

Let’s Make a Microcontroller…


Start With a Core…


ARM Cortex-M0+ Use Case


Add the bare necessities…

ProtectionPOR, WDT, BOD

Memories

Timers/Counters

CommunicationPeripherals


• Add the things you do not have to have in a micro

• ADC

• DAC

• Analog Comparators

• DMA

• Higher end peripherals

• USB

• Ethernet

• Portability

• …

• ..

How Do You Differentiate


How Do You Differentiate


Memories

Timers/Counters


ADC, DAC, AC

DMA

USB

…


And then….


Memories

Timers/Counters


ADC, DAC, AC

DMA

USB

…

Better

Faster Wakeup

Enhanced PWM

Fully Flexible

Smarter!

Advanced triggers

No Xtal

Custom Periph.


And then….


Memories

Timers/Counters


ADC, DAC, AC

DMA

USB

…

Better

Enhanced PWM

Fully Flexible

Smarter!

Advanced triggers

No XtalAdvanced Clocking and

Power Management

Offload CPU with Innovative peripherals

Faster Wakeup

Custom Periph.


Think Beyond The Core….

A Cortex M0+ MCU is NOT just a Cortex M0+ MCU


• DMA

• Well known technology to offload CPU from data transfer operations

• Performance and cost options

• Basic

• Dedicated channel per DMA request

• Control registers appear interleaved with register map in peripheral

• Simple transfer and ring buffer supported

• Simple implementation with low baseline cost for a few channels

• Higher performance option

• Generic DMA for peripheral-memory / memory-memory transfers

• Descriptor support for complex transfers

• Muxed channels between peripherals

• QoS support

• Medium initial cost, but low cost per added channel

Offloading the CPU - DMA


Offloading the CPU - Peripheral Co-operation

The Peripheral Event System


CPU


CPU

• Timer starts DAC conversion


CPU

• Timer starts DAC conversion• Analog Comparator stops PWM


• Timer starts DAC conversion• Analog Comparator stops PWM• I/O starts ADC + time stamp

CPU


CPU

• Timer starts DAC conversion• Analog Comparator stops PWM• I/O starts ADC + time stamp• …


CPU

Overload

• Timer starts DAC conversion• Analog Comparator stops PWM• I/O starts ADC + time stamp• …


Atmel

Solution


Atmel


• Inter-peripheral Communication

• CPU independent

• Eight independent channels

• Synchronous and Asynchronous

• Latency-free Event Handling

• Safe fault protection

• 100% predictable reaction time

• Advantages

• Accurate timing

• Efficiently offloading CPU

• Reduced power consumption

Offloading the CPU - Peripheral Co-operation

The Peripheral Event System


• Hardwired co-operation from IO, TC, RTC can trigger ADC event

• Programmable system connecting most peripherals

How Far Do You Want to Take It?


Offloading the CPU - Clock On Demand

Atmel Sleep walking

t

W

Standard

RTC + LCD

Active

RTC + LCD

Active Active

CPU wakes andrun AC. Result< thresold, goesback to sleep

2

RTC

AC

CPU

RAMLCD

CPU

Write messageon LCD

5

RTC

AC

CPU

LCD

3

RTC

ADC

CPU

RAMLCD

CPU

AC

RTC wakes-upCPU

CPU wakes andrun AC. Result> thresold.

4

RTC

AC

CPU

RAMLCD

CPURTC

ADC

CPU

RAMAC LCD

CPU

RTC wakes-upCPU

1


RTC

ADC

CPU

RAMAC LCD

CPU

RTC wakes ACto measure temperature

1

Temperaturebelow threshold: Return to sleep

2

RTC

AC

CPU

LCD

CPU

Temperatureabove threshold:Wakes-up CPU

4

RTC

AC

CPU

RAMLCD

CPU

Active mode

5

RTC

AC

CPU

LCD

3

RTC

ADC

CPU

LCD

CPU

AC

RTC wakes ACto measure temperature

Offloading the CPU - Clock On Demand

Atmel Sleep walking

t

W

Standard Smart perhipherals

RTC + LCD

Active

RTC + LCD

Active Active

RTC + LCDRTC + LCD + AC

RTC + LCDRTC + LCD + AC

Active

Reduces power consumption by 57%


Offloading the CPU – Custom Peripherals

The Atmel Peripheral Touch Controller (PTC)

• Any MCU can do Capacitive Touch Detection

• Traditionally based on firmware only, or combination of firmware and hardware

• The PTC handle the touch acquisition in HW

• Based on Atmels MaxTouch technology

• Self-(re)calibrating, no tuning needed

• No external components needed

• Application benefits:

• Power consumption <1/10th of trad. approach

• Significantly offloading the CPU


Thinking Beyond The Silicon...


Tools and Ecosystem

Complete Integrated Development Tools Platform

Atmel GalleryAtmel Software Framework

Atmel Studio 6

Embedded Software

Development Tools

App Store

Xplained Pro

Hardware Tools and Kits

Common platform for 8- and 32-bit

development


Complimentary product Offering

Supported by both 8- and 32- bit Atmel MCUs

Capacitive Touch Sensing

Authentication and SecurityWireless Solutions

Application Specific


• Bolting on standard peripherals to a standard core will not get you an interesting product

• Add SMARTNESS to the entire product, not just the Core

• Add FLEXIBILITY where you can

• OPTIMIZE away performance bottlenecks

• Device performance is much more than MCU core performance…

• Device selection is much more than MCU core selection…

• Selecting an MCU vendor is much more than selecting an MCU…

Summary

Atmel | SMARTarmtechforum.com.cn/2014/bj/B-7_Atmel.pdf · 30 © 2014 Atmel Confidential Offloading...

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