434 Digital Signal Controller

Advanced Solutions SellingChoose Your Dance Partner PIC® MCU or dsPIC® DSC?… Choose Your Dance Partner  Overview of new features of dsPIC® digital signal controller DSC  You should get

ADVANCED SOLUTIONS SELLING

2004 Worldwide Sales Conference

ADVANCED SOLUTIONS SELLING

2004 Worldwide Sales Conference

434 HOW

434 HOW

dsPIC® DSC … What makes it tick?

It’s really slick.

Digital Signal Controller

PIC® MCU or dsPIC® DSC?… Choose Your Dance Partner

Digital Signal Controller

PIC® MCU or dsPIC® DSC?…

Choose Your Dance Partner

The 16-bit MCU with the power of DSP

Advanced Solutions Selling

Choose Your Dance Partner

PIC® MCU or dsPIC® DSC?… Choose Your Dance Partner

 Overview of new features of dsPIC® digital signal controller (DSC)

 You should get a perspective of the differences

 You should know the key system requirements that mean a

customer should be using dsPIC DSC

 Your presenter : Steven Lin

 Overview of new features of dsPIC® digital signal controller (DSC)

 You should get a perspective of the differences

 You should know the key system requirements that mean a

customer should be using dsPIC DSC

Advanced Solutions Selling

Dance with who brung ya…

Let’s Keep the Good Stuff from PIC® MCU

On dsPIC® DSC

Advanced Solutions Selling

dsPIC® / PIC® Compatibility

 Are your customers nervous about stepping up to a dsPIC DSC?

a little dsP plus a lot of PIC MCU

 Are your customers nervous about stepping up to a dsPIC DSC?

Advanced Solutions Selling

 Compatibility allows customers to apply PC board lessons learned

on one product to another

 High degree of pinout compatibility for PIC® MCU and dsPIC® DSC

 100% Compatible on

 Power / Ground, Master Clear, Oscillator

 Compatible on analog

 Compatibility allows customers to apply PC board lessons learned

on one product to another

Vss

Vdd Vdd Vss

AN4 AN3 AN2 AN1 AN0

Advanced Solutions Selling

dsPIC® Peripherals have the same I/O as PIC peripherals

dsPIC Peripherals have the same functionality as PIC® peripherals

dsPIC® Peripherals have the same I/O as PIC peripherals

dsPIC Peripherals have the same functionality as PIC® peripherals

Peripheral Compatibility

TMR TMR

SPI

SDO SDI SCK

CCP CCP

UART

TX RX

I2C

SCL SDA CAN

TXx RXx

TMR TMR

SPI

SDO SDI SCK

IC IC/OC OC

UART

TX RX

I2C

SCL SDA CAN

TXx RXx

Advanced Solutions Selling

dsPIC INSTRUCTIONS

Instruction Set Compatibility

 dsPIC ® processor architecture is based on PIC ® MCU

 dsPIC Programmers Model is a superset of PIC MCU

 Most PIC18 instructions are included in dsPIC DSC

 dsPIC ® processor architecture is based on PIC ® MCU

 dsPIC Programmers Model is a superset of PIC MCU

 Most PIC18 instructions are included in dsPIC DSC

PIC INSTRUCTIONS

Advanced Solutions Selling

Tools Compatibility

 All Microchip Tools are useable on dsPIC® DSC

 Same user interface

 PIC® customer is totally comfortable using dsPIC tools

 All Microchip Tools are useable on dsPIC® DSC

 Same user interface

 PIC® customer is totally comfortable using dsPIC tools

Advanced Solutions Selling

Start the Music

Did you know that a MP3 Player is

doing

DSP Processing

Advanced Solutions Selling

Typical DSP System

What does a typical DSP system look like?

dsPIC30F6014

 It takes real world signal

 It takes real world signal

 Processes the signal using digital calculations

 Processes the signal using digital calculations

 Outputs a resulting real world signal

 Outputs a resulting real world signal

But doesn’t a microprocessor system do the same thing? What’s different about DSP?

 Let’s dig a little deeper

But doesn’t a microprocessor system do the same thing? What’s different about DSP?

 Let’s dig a little deeper

Advanced Solutions Selling

Noisy Audio

dsPIC30F6014

Digital Filter

 A digital filter is used to mathematically

signal

Clear Audio

10011100 01110111 11001101

Real time audio signal output

Advanced Solutions Selling

DSP Key Words

 Audio (a song) doesn’t sound right stopped in the middle

 Real time means the processing cannot wait, requires very high speed processing

 If the customer requires Real Time, look to dsPIC® DSC

 Digital Filter

 Filters will modify or clean a signal

 Many customer systems will require some type of Digital Filter to process the signal

 A DSP contains many specialized instructions that help the

customer filter the signal

 If the system requires Digital Filters, look to dsPIC DSC

 Real Time

 Audio (a song) doesn’t sound right stopped in the middle

 Real time means the processing cannot wait, requires very high speed processing

 If the customer requires Real Time, look to dsPIC® DSC

 Digital Filter

 Filters will modify or clean a signal

 Many customer systems will require some type of Digital Filter to process the signal

 A DSP contains many specialized instructions that help the

customer filter the signal

 If the system requires Digital Filters, look to dsPIC DSC

Advanced Solutions Selling

DSP Motor Control System

 In this system

 Position sensors detect Real Time motor position

 Output voltage controls the Real Time motor movement

 Processor uses Digital Control Loop to compute voltage required

to achieve desired position

 Key Words: Digital Control Loop

 In this system

 Position sensors detect Real Time motor position

 Output voltage controls the Real Time motor movement

 Processor uses Digital Control Loop to compute voltage required

to achieve desired position

 Key Words: Digital Control Loop

Motor Position 10011011 01110101 Motor Voltage

11001011

10011100 01110111 11001101

Digital Control Loop

Advanced Solutions Selling

DSP Key Words

 Digital Control Loop

 A digital control loop mathematically interprets the signal, in this case, position information, making sure it’s at the desired value

 Digital control loops require high precision numbers and lots of multiplies

 If the customer requires Digital Control Loop, look to dsPIC® DSC

 Any application that requires

 Fast real time processing of real world signals

 High precision computations, For example 32-bit

 Digital Control Loop

 A digital control loop mathematically interprets the signal, in this case, position information, making sure it’s at the desired value

 Digital control loops require high precision numbers and lots of multiplies

 If the customer requires Digital Control Loop, look to dsPIC® DSC

 Any application that requires

 Fast real time processing of real world signals

 Complex mathematic computations

 High precision computations, For example 32-bit

 Look to dsPIC DSC

Advanced Solutions Selling

DSP Anti-Lock Brake System (ABS)

 In this system

 Sensors detect Real Time wheel speed data

 Output signal controls the Real Time brake pressure

 Processor uses Digital Filters to detect changes in wheel speed and Digital Control Loop to modulate brake

pressure

 In this system

 Sensors detect Real Time wheel speed data

 Output signal controls the Real Time brake pressure

 Processor uses Digital Filters to detect changes in wheel speed and Digital Control Loop to modulate brake

pressure

ABS Brakes

10011011 01110101 11001011

Digital Filter / Contro l Loop

10011100 01110111 11001101

Wheel Speed

Advanced Solutions Selling

Special DSP Instructions

 What special instructions are used in a filter or control loop?

 There is a set of special DSP instructions included in dsPIC® DSC that speed processing of the typical mathematic calculations used in filters and control loops

 MAC instruction – Multiply and Accumulate

 Also Multiply and Subtract, Square and Accumulate, etc

 19 special DSP instructions total

 MULTIPLY, DIVIDE and bit shift instructions

 REPEAT instruction – repeats an instruction many times

 With DSP instructions, this complex equation can be computed using only 2 instruction words and 5 instruction cycles!

 What special instructions are used in a filter or control loop?

 There is a set of special DSP instructions included in dsPIC® DSC that speed processing of the typical mathematic calculations used in filters and control loops

 MAC instruction – Multiply and Accumulate

 Also Multiply and Subtract, Square and Accumulate, etc

 19 special DSP instructions total

 MULTIPLY, DIVIDE and bit shift instructions

 REPEAT instruction – repeats an instruction many times

 With DSP instructions, this complex equation can be computed using only 2 instruction words and 5 instruction cycles!

  n  b0x   n  b1x  n  1   b2x  n  2   b3x  n  3 

y

Advanced Solutions Selling

Special DSP Addressing

Modes

Special DSP Addressing

Modes

 What other dsPIC® DSC features help the customer make a filter or

digital control loop?

 DSP calculations involve a lot of data words dsPIC DSC has special addressing modes that help

 Modulo addressing – scans through a block of data

 Bit reversed addressing – needed by Fast Fourier Transform (FFT) calculation software

 16-bit and 32-bit data move operations

 DSP calculations also need to adjust the values of the data Your DSP customers will call this “scaling”

 dsPIC uses a 40-bit accumulator and has automatic scaling of data on reads and writes

 What other dsPIC® DSC features help the customer make a filter or

digital control loop?

 DSP calculations involve a lot of data words dsPIC DSC has special addressing modes that help

 Modulo addressing – scans through a block of data

 Bit reversed addressing – needed by Fast Fourier Transform (FFT) calculation software

 16-bit and 32-bit data move operations

 DSP calculations also need to adjust the values of the data Your DSP customers will call this “scaling”

 dsPIC uses a 40-bit accumulator and has automatic scaling of data on reads and writes

Advanced Solutions Selling

Special DSP Features

 How does dsPIC® DSC assist Real Time processing?

 30 MIPS – up to 30 million calculations per second

 Powerful instructions do many operations at the same time

 Example: MAC instuction

 Gets 2 data values from memory

 Multiplies them together

 Adds the result to the accumulator

 What does dsPIC® DSC have to help with high precision calculations?

 The working registers of dsPIC® DSC are all 16-bits

 The dsPIC® DSC does 32-bit multiply and 32-bit divide

 The dsPIC® DSC has a 40-bit accumulator for calculation results

 Special instructions allow simple transfers of 16 and 32-bit data

 How does dsPIC® DSC assist Real Time processing?

 30 MIPS – up to 30 million calculations per second

 Powerful instructions do many operations at the same time

 Example: MAC instuction

 Gets 2 data values from memory

 Multiplies them together

 Adds the result to the accumulator

 What does dsPIC® DSC have to help with high precision calculations?

 The working registers of dsPIC® DSC are all 16-bits

 The dsPIC® DSC does 32-bit multiply and 32-bit divide

 The dsPIC® DSC has a 40-bit accumulator for calculation results

 Special instructions allow simple transfers of 16 and 32-bit data

Advanced Solutions Selling

How is dsPIC® DSC different

 One instruction set

 One register file

 dsPIC® DSC seamlessly

integrates the PIC

Microcontroller functions

and DSP functions

 One instruction set

 One register file

DSP + PIC

MCU

DSP

instructions to a DSP architecture

peripherals to a MCU architecture

 Other solutions either

instructions to a DSP architecture

peripherals to a MCU architecture

Advanced Solutions Selling

Knowledge Check

What does the MAC instruction do?

A: More Adding and CarryingB: Multiply and AccumulateC: Move All Cells

A customer is building a security system that will monitor the signal from

a glass break sensor dsPIC® DSP features can:

A: Multiply the thickness of the glassB: Implement a filter to check for signals associated with breaking glass

C: Add up the cost of the glass

What does the MAC instruction do?

A: More Adding and Carrying

B: Multiply and Accumulate

C: Move All Cells

A customer is building a security system that will monitor the signal from

a glass break sensor dsPIC® DSP features can:

A: Multiply the thickness of the glass

B: Implement a filter to check for signals associated with

breaking glass

C: Add up the cost of the glass





Advanced Solutions Selling

Knowledge Check

Super Bonus Question:

What is this equation used for?

What is it called?

Super Bonus Question:

What is this equation used for?

What is it called?

  n  b0x   n  b1x  n  1   b2x  n  2   b3x  n  3 

y

This equation is a digital filter

Finite Impulse Response (FIR) Filter

Advanced Solutions Selling

Shake that BIG Booty

Does your customer have a big …

PROGRAM?

Advanced Solutions Selling

dsPIC30F CPU

 Single Core : MCU + DSP

 Instruction is 24-bit wide

 Total Space:

4M x 24-bit Linear Program Space

 Devices contain up to 144K

Byte Flash Memory

 Single Core : MCU + DSP

 Instruction is 24-bit wide

 Total Space:

4M x 24-bit Linear Program Space

 Devices contain up to 144K

Byte Flash Memory

144K Flash

4M Total

24 Bit Instruction

Advanced Solutions Selling

dsPIC30F CPU

 Data is 16-bit wide

 Total Space:

64K Bytes Linear Data Space

 Devices contain up to 16K

Byte User RAM

 Plenty of room for your

customers largest applications

 Data is 16-bit wide

 Total Space:

64K Bytes Linear Data Space

 Devices contain up to 16K

Byte User RAM

 Plenty of room for your

customers largest applications 16K RAM

64K Total

16 Bit Data

Advanced Solutions Selling

It takes Two to Tango

Processor Features that Dance with the C Compiler

for Efficient Code

Advanced Solutions Selling

How did the C Compiler Get So

+New MCU instructions

+More flexible addressing

=Smallest C code

Software stack

+Working Register Array

+New MCU instructions

+More flexible addressing

Advanced Solutions Selling

 C compiler can allocate as much stack

space as needed and use it for

 C compiler can allocate as much stack

space as needed and use it for

PC<15:1>

PC<22:16> 000000000

0 Parameter 3 = W2 Parameter 2 = W1 Parameter 1 = W0 INT34 return addr

W15 >

SUBR3 return addr

Advanced Solutions Selling

Why so many W Registers

Why so many W Registers

Stack Pointer

W0 W1 W2 W3 W4 W5 W6 W7 W8 W9 W10 W11 W12 W13 W14 W15

15 0

Frame Pointer PIC ® compatible WREG

15 0

0

 Array of 16 working registers

 C compiler has many resources available

 Any W register can be used as

 A data register or

 An address pointer

 Flexibility helps the C compiler

optimize code

 Array of 16 working registers

 C compiler has many resources available

 Any W register can be used as

 A data register or

 An address pointer

 Flexibility helps the C compiler

optimize code

 Working registers also store data and addresses used in DSP

calculations, no need for special DSP registers

 Working registers also store data and addresses used in DSP

calculations, no need for special DSP registers

Advanced Solutions Selling New Addressing Modes

File Register (PIC18 Compatible)

 Flexible addressing modes helps the C compiler access data with minimum overhead.

 Results - more compact code

Advanced Solutions Selling

New MCU Instructions

 Powerful MCU instructions reduce number of instructions required to realize function

 3-operand MCU instructions

 Multiply and Divide instructions

 REPEAT and DO loops simplify program flow control

 All Instructions can use software stack

 Powerful MCU instructions reduce number of instructions required to realize function

 3-operand MCU instructions

 ADD A,B,C -> C = A + B

 Multiply and Divide instructions

 REPEAT and DO loops simplify program flow control

 All Instructions can use software stack