56F8357 View Datasheet(PDF) - Motorola => Freescale

Part Name

Description

Manufacturer

56F8357

16-bit Digital Signal Processor

Motorola => Freescale 

Freescale Semiconductor, Inc.

The 56F8357 hybrid controller includes 256KB of Program Flash and 8KB of Data Flash (each

programmable through the JTAG port) with 4KB of Program RAM and 16KB of Data RAM. It

also supports program execution from external memory.

A total of 16KB of Boot Flash is incorporated for easy customer-inclusion of field-programmable

software routines that can be used to program the main Program and Data Flash memory areas.

Both Program and Data Flash memories can be independently bulk erased or erased in pages.

Program Flash page erase size is 1KB. Boot and Data Flash page erase size is 512 bytes. The Boot

Flash memory can also be either bulk or page erased.

A key application-specific feature of the 56F8357 is the inclusion of two Pulse Width Modulator

(PWM) modules. These modules each incorporate three complementary, individually

programmable PWM signal output pairs (each module is also capable of supporting six

independent PWM functions, for a total of 12 PWM outputs) to enhance motor control

functionality. Complementary operation permits programmable dead time insertion, distortion

correction via current sensing by software, and separate top and bottom output polarity control. The

up-counter value is programmable to support a continuously variable PWM frequency.

Edge-aligned and center-aligned synchronous pulse width control (0% to 100% modulation) is

supported. The device is capable of controlling most motor types: ACIM (AC Induction Motors);

both BDC and BLDC (Brush and Brushless DC motors); SRM and VRM (Switched and Variable

Reluctance Motors); and stepper motors. The PWMs incorporate fault protection and

cycle-by-cycle current limiting with sufficient output drive capability to directly drive standard

optoisolators. A “smoke-inhibit”, write-once protection feature for key parameters is also included.

A patented PWM waveform distortion correction circuit is also provided. Each PWM is

double-buffered and includes interrupt controls to permit integral reload rates to be programmable

from 1 to 16. The PWM modules provide a reference output to synchronize the Analog-to-Digital

Converters through two channels of Quad Timer C.

The 56F8357 incorporates two Quadrature Decoders capable of capturing all four transitions on

the two-phase inputs, permitting generation of a number proportional to actual position. Speed

computation capabilities accommodate both fast- and slow-moving shafts. An integrated watchdog

timer in the Quadrature Decoder can be programmed with a time-out value to alarm when no shaft

motion is detected. Each input is filtered to ensure only true transitions are recorded.

This hybrid controller also provides a full set of standard programmable peripherals that include

two Serial Communications Interfaces (SCIs); two Serial Peripheral Interfaces (SPIs); and four

Quad Timers. Any of these interfaces can be used as General Purpose Input/Outputs (GPIOs) if

that function is not required. A Flex Controller Area Network (FlexCAN) interface (CAN Version

2.0 B-compliant) and an internal interrupt controller are a part of the 56F8357.

1.3 Award-Winning Development Environment

Processor ExpertTM (PE) provides a Rapid Application Design (RAD) tool that combines

easy-to-use component-based software application creation with an expert knowledge system.

The CodeWarrior Integrated Development Environment is a sophisticated tool for code navigation,

compiling, and debugging. A complete set of evaluation modules (EVMs) and development

system cards will support concurrent engineering. Together, PE, CodeWarrior and EVMs create a

complete, scalable tools solution for easy, fast, and efficient development.

6

56F8357 Technical Data

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Go to: www.freescale.com

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