MCF51EM128 查看數據表（PDF） - Freescale Semiconductor

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MCF51EM128

ColdFire Microcontroller

Freescale Semiconductor 

MCF51EM256 Series Configurations

— 6 μs typical wakeup time from stop3 mode

• Clock source options

— Two independent oscillators (XOSC1 and XOSC2) — loop-control Pierce oscillator;

32.768 kHz crystal or ceramic resonator. XOSC1 nominally supports the independent real time

clock, and can be powered by a separate battery backup. XOSC2 is the primary external clock

source for the ICS

— Internal clock source (ICS) — internal clock source module containing a

frequency-locked-loop (FLL) controlled by internal or external reference (XOSC1 or XOSC2);

precision trimming of internal reference allowing 0.2% resolution and typical 0.5% to –1%

deviation over temperature and voltage; supporting CPU frequencies from 4 kHz to 50 MHz

• System protection

— Watchdog computer operating properly (COP) reset with option to run from dedicated 1 kHz

internal clock source or bus clock

— Low voltage detection with reset or interrupt; selectable trip points; seperate low voltage

warning with optional interrupt; selectable trip points

— Illegal opcode and illegal address detection with reset

— Flash block protection for each array to prevent accidental write/erasure

— Hardware CRC module to support fast cyclic redundancy checks

• Development support

— Integrated ColdFire DEBUG_Rev_B+ interface with single wire BDM connection supports

same electrical interface used by the S08 family debug modules

— Real-time debug support with six hardware breakpoints (4 PC, 1 address and 1 data)

— On-chip trace buffer provides programmable start/stop recording conditions

• Peripherals

— ADC16 — 4 analog-to-digital converters; the 100 pin version of the device has 1 dedicated

differential channel and 1 dedicated single-ended channel per ADC, along with 3 muxed

single-ended channels per ADC. The ADCs have 16-bit resolution, range compare function,

1.7 mV/°C temperature sensor, internal bandgap reference channel, operate in stop3 and are

fully functional from 3.6 V to 1.8 V

— PDB — Programmable delay block with 16-bit counter and modulus and 3-bit prescaler; 8

trigger outputs for ADC16 modules (2 per ADC); provides periodic coordination of ADC

sampling sequence with programmable sequence completion interrupt

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

all MCU modes; external clock source with trim capabilities (XOSC1); independent voltage

source runs IRTC when MCU is powered-down; tamper detection and indicator; battery

monitor output to ADC; unaffected by MCU resets

— PRACMPx — Two analog comparators with selectable interrupt on rising, falling, or either

edge of comparator output; compare option to programmable internal reference voltage;

operation in stop3

— LCD — up to 288 segments (8 × 36); 160 segments (4 × 40); internal charge pump and option

to provide internal reference voltage that can be trimmed for contrast control; flexible

MCF51EM256 Series ColdFire Microcontroller Data Sheet, Rev.2

8

Preliminary—Subject to Change Without Notice

Freescale Semiconductor

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