MCF51EM128 View Datasheet(PDF) - Freescale Semiconductor

Part Name

Description

Manufacturer

MCF51EM128

ColdFire Microcontroller

Freescale Semiconductor 

MCF51EM256 Series Configurations

1.3 Features

Table 2 describes the functional units of the MCF51EM256 series.

Table 2. MCF51EM256 Series Functional Units

Unit

Function

ADC (analog-to-digital converter)

Measures analog voltages at up to 16 bits of resolution. Each ADC has

up to four differential and 24 single-ended inputs.

BDM (background debug module)

Provides single pin debugging interface (part of the V1 ColdFire core)

CF1 CORE (V1 ColdFire core) with MAC Executes programs, handles interrupts and containes

unit

multiply-accumulate hardware (MAC).

PRACMP1, PRACMP2 (comparators)

Analog comparators for comparing external analog signals against

each other, or a variety of reference levels.

COP (computer operating poperly)

Software watchdog

IRQ (interrupt request)

Single pin high priority interrupt (part of the V1 ColdFire core)

CRC (cyclic Redundancy Check)

High-speed CRC calculation

DBG (debug)

Provides debugging and emulation capabilities (part of the V1 ColdFire

core)

FLASH (flash memory)

Provides storage for program code, constants and variables

IIC (inter-integrated circuits)

Supports standard IIC communications protocol and SMBus

INTC (interrupt controller)

Controls and prioritizes all device interrupts

KBI1 & KBI2

Keyboard Interfaces 1 and 2

LCD

Liquid crystal display driver

LVD (low voltage detect)

Provides an interrupt to the CF1CORE in the event that the supply

voltage drops below a critical value. The LVD can also be programmed

to reset the device upon a low voltage event

ICS (internal clock source)

Provides clocking options for the device, including a three

frequency-locked loops (FLLs) for multiplying slower reference clock

sources

IRTC (independent real-time clock)

The independent real time clock provides an independent time-base

with optional interrupt, battery backup and tamper protection

VREF (voltage reference)

The voltage reference output is available for both on and off-chip use

MTIM1, MTIM2 (modulo timers)

8-bit modulo timers with configurable clock inputs and interrupt

generation on overflow

MTIM3 (modulo timer)

16-bit modulo timer with configurable clock inputs and interrupt

generation on overflow

PDB (programmable delay block)

This timer is optimized for scheduling ADC conversions

RAM (random-access memory)

Provides stack and variable storage

RGPIO (rapid general-purpose

input/output)

Allows for I/O port access at CPU clock speeds and is used to

implement GPIO functionality for PTA and PTB.

MCF51EM256 Series ColdFire Microcontroller Data Sheet, Rev.2

6

Preliminary—Subject to Change Without Notice

Freescale Semiconductor

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