MCF51EM128 查看數據表（PDF） - Freescale Semiconductor

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MCF51EM128

ColdFire Microcontroller

Freescale Semiconductor 

MCF51EM256 Series Configurations

Table 2. MCF51EM256 Series Functional Units (continued)

Unit

Function

SCI1, SCI2, SCI3(serial communications Serial communications UARTs capable of supporting RS-232 and LIN

interfaces)

protocols

SIM (system integration unit)

SPI1 (FIFO), SPI2, SPI3 (serial peripheral SPI1 has full-complementary drive outputs. SPI2 may be configured

interfaces)

with full-complementary drive output via LCD control registers. SPI3

has open drain outputs on SCLK and (MISO or MOSI). These coupled

with off-chip pull-up resistors, allow interface to an external 5 V SPI.

TPM (Timer/PWM Module)

Timer/PWM module can be used for a variety of generic timer

operations as well as pulse-width modulation

VREG (voltage regulator)

Controls power management across the device

XOSC1 and XOSC2 (crystal oscillators)

These devices incorporate redundant crystal oscillators in separate

power domains.One is intended primarily for use by the IRTC, and the

other by the CPU and other peripherals.

1.3.1 Feature List

• 32-bit ColdFire V1 central processor unit (CPU)

— Up to 50.33 MHz ColdFire CPU from 3.6 V to 2.5 V and 20 MHz CPU at 2.5 V to 1.8 V across

temperature range of –40 °C to 85 °C

— ColdFire instruction set revision C (ISA_C) plus MAC

— 32-bit multiply and accumulate (MAC) optimized for 16×16±32 operations; supports signed or

unsigned integer or signed fractional inputs

• On-chip memory

— MCF51EM256/128 series support two independent flash arrays; read/program/erase over full

operating voltage and temperature; allows interrupt processing while programming for robust

program updates

— Random-access memory (RAM)

— Security circuitry to prevent unathorized access to RAM and Flash contents

• Power-saving modes

— Two ultra-low power stop modes

— New low-power run and low-power wait modes

— Reduced power wait mode

— Peripheral clock enable register can disable clocks to unused modules, thereby reducing

currents

— Ultra-low power independent real time clock with calendar features (IRTC); runs in all MCU

modes; external clock source with trim capabilities; independent voltage source runs IRTC

when MCU is powered-down; tamper detection and indicator; battery monitor output to ADC;

unaffected by MCU resets

— Ultra-low power external oscillator that can be used in stop modes to provide accurate clock

source to IRTC, ICS and LCD

MCF51EM256 Series ColdFire Microcontroller Data Sheet, Rev.2

Freescale Semiconductor

Preliminary—Subject to Change Without Notice

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