Overview

This chapter provides an overview of the microprocessor features, including the major functional components.

Key Features

A block diagram of the MCF528x and MCF521x is shown in Figure 1-1. The main features are as follows:

? Static Version 2 ColdFire variable-length RISC processor

— Static operation

— On-chip 32-bit address and data path

— Processor core and bus frequency up to 80 MHz

— Sixteen general-purpose 32-bit data and address registers

— ColdFire ISA_A with extensions to support the user stack pointer register, and four new instructions for improved bit processing

— Enhanced Multiply-Accumulate (EMAC) unit with four 48-bit accumulators to support 32-bit signal processing algorithms

— Illegal instruction decode that allows for 68K emulation support

? System debug support

— Real-time trace for determining dynamic execution path

— Background debug mode (BDM) for in-circuit debugging

— Real time debug support, with one user-visible hardware breakpoint register (PC and address with optional data) that can be configured into a 1- or 2-level trigger

? On-chip memories

— 2-Kbyte cache, configurable as instruction-only, data-only, or split I-/D-cache

— 64-Kbyte dual-ported SRAM on CPU internal bus, accessible by core and non-core bus masters

(e.g., DMA, FEC) with standby power supply support

— 512 Kbytes of interleaved Flash memory supporting 2-1-1-1 accesses

(256 Kbytes on the MCF5281 and MCF5214, no Flash on MCF5280)

– This product incorporates SuperFlash? technology licensed from SST.

? Power management

— Fully-static operation with processor sleep and whole chip stop modes

— Very rapid response to interrupts from the low-power sleep mode (wake-up feature)

— Clock enable/disable for each peripheral when not used

? Fast Ethernet Controller (FEC) (not available on the MCF5214 and MCF5216)

— 10BaseT capability, half- or full-duplex

— 100BaseT capability, half- or limited-throughput full-duplex

— On-chip transmit and receive FIFOs

— Built-in dedicated DMA controller

— Memory-based flexible descriptor rings

— Media-independent interface (MII) to transceiver (PHY)

? FlexCAN 2.0B Module

— Includes all existing features of the Freescale TouCAN module

— Full implementation of the CAN protocol specification version 2.0B

– Standard data and remote frames (up to 109 bits long)

– Extended data and remote frames (up to 127 bits long)

– 0–8 bytes data length

– Programmable bit rate up to 1 Mbit/sec

— Up to 16 message buffers (MBs)

– Configurable as receive (Rx) or transmit (Tx)

– Support standard and extended messages

— Unused message buffer (MB) space can be used as general-purpose RAM space

— Listen-only mode capability

— Content-related addressing

— No read/write semaphores

— Three programmable mask registers

– Global (for MBs 0-13)

– Special for MB14

– Special for MB15

— Programmable transmit-first scheme: lowest ID or lowest buffer number

— “Time stamp” based on 16-bit free-running timer

— Global network time, synchronized by a specific message

— Programmable I/O modes

— Maskable interrupts

? Three universal asynchronous/synchronous receiver transmitters (UARTs)

— 16-bit divider for clock generation

— Interrupt control logic

— Maskable interrupts

— DMA support

— Data formats can be 5, 6, 7, or 8 bits with even, odd, or no parity

— Up to 2 stop bits in 1/16 increments

— Error-detection capabilities

— Modem support includes request-to-send (URTS) and clear-to-send (UCTS) lines for two UARTs

— Transmit and receive FIFO buffers

? I2C module

— Interchip bus interface for EEPROMs, LCD controllers, A/D converters, and keypads

— Fully compatible with industry-standard I2C bus

— Master or slave modes support multiple masters

— Automatic interrupt generation with programmable level

? Queued serial peripheral interface (QSPI)

— Full-duplex, three-wire synchronous transfers

— Up to four chip selects available

— Master mode operation only

— Programmable master bit rates

— Up to 16 pre-programmed transfers

? Queued analog-to-digital converter (QADC)

— 8 direct, or up to 18 multiplexed, analog input channels

— 10-bit resolution +/- 2 counts accuracy

— Minimum 7 μS conversion time

— Internal sample and hold

— Programmable input sample time for various source impedances

— Two conversion command queues with a total of 64 entries

— Sub-queues possible using pause mechanism

— Queue complete and pause software interrupts available on both queues

— Queue pointers indicate current location for each queue

— Automated queue modes initiated by:

– External edge trigger and gated trigger

– Periodic/interval timer, within QADC module [Queue 1 and 2]

– Software command

— Single-scan or continuous-scan of queues

— Output data readable in three formats:

– Right-justified unsigned

– Left-justified signed

– Left-justified unsigned

— Unused analog channels can be used as digital I/O

— Low pin-count configuration implemented

? Four 32-bit DMA timers

— 15-ns resolution at 80 MHz (66 MHz for MCF5214 and MCF5216)

— Programmable sources for clock input, including an external clock option

— Programmable prescaler

— Input-capture capability with programmable trigger edge on input pin

— Output-compare with programmable mode for the output pin

— Free run and restart modes

— Maskable interrupts on input capture or reference-compare

— DMA trigger capability on input capture or reference-compare

? Two 4-channel general purpose timers

— Four 16-bit input capture/output compare channels per timer

— 16-bit architecture

— Programmable prescaler

— Pulse widths variable from microseconds to seconds

— Single 16-bit pulse accumulator

— Ability to boot from internal Flash memory or external memories that are 8, 16, or 32 bits wide (Continue..)