PXS20 datasheet(17/119 Pages) FREESCALE

17 / 119 page

Introduction

PXS20 Microcontroller Data Sheet, Rev. 1

Preliminary—Subject to Change Without Notice

Freescale Semiconductor

— Sync field; Delimiter; ID parity; Bit, Framing; Checksum and Timeout errors

— Classic or extended checksum calculation

— Configurable Break duration of up to 36-bit times

— Programmable Baud rate prescalers (13-bit mantissa, 4-bit fractional)

— Diagnostic features

–

Loop back

–Self Test

–

LIN bus stuck dominant detection

— Interrupt driven operation with 16 interrupt sources

— LIN slave mode features

–

Autonomous LIN header handling

–

Autonomous LIN response handling

–

Discarding of irrelevant LIN responses using up to 16 ID filters

1.5.29

Serial Peripheral Interface (SPI)

The SPI modules provide a synchronous serial interface for communication between the PXS20 and external devices.

A SPI module provides these features:

•

Full duplex, synchronous transfers

•

Master or slave operation

•

Programmable master bit rates

•

Programmable clock polarity and phase

•

End-of-transmission interrupt flag

•

Programmable transfer baud rate

•

Programmable data frames from 4 to 16 bits

•

As many as 8 chip select lines available, depending on package and pin multiplexing

•

4 clock and transfer attributes registers

•

Chip select strobe available as alternate function on one of the chip select pins for de-glitching

•

FIFOs for buffering as many as 5 transfers on the transmit and receive side

•

Queueing operation possible through use of the eDMA

•

General purpose I/O functionality on pins when not used for SPI

1.5.30

Pulse Width Modulator (PWM)

The PWM module contains four PWM channels, each of which is configured to control a single half-bridge power stage. Two

modules are included on 257 MAPBGA devices; on the 144 LQFP package, only one module is present. Additionally, four

fault input channels are provided per PWM module.

This PWM is capable of controlling most motor types, including:

•

AC induction motors (ACIM)

•

Permanent Magnet AC motors (PMAC)

•

Brushless (BLDC) and brush DC motors (BDC)

•

Switched (SRM) and variable reluctance motors (VRM)

•

Stepper motors

A PWM module implements the following features:

•

16 bits of resolution for center, edge aligned, and asymmetrical PWMs

PXS20 Datasheet(PDF) 17 Page - Freescale Semiconductor, Inc

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