Datasheet

Target Applications
• Smartmetering
• Sensorcollection
• Phasemeasurementunits
• Industrialenergymeasurement
• 1-and3-phaseelectricitymeters
Overview
MCF51EM 32-bit MCU is a highly-integrated
single-chip device with high-performance
peripherals.
Unique features of the MCF51EM family
include 4 x 16-bit SAR ADC with PDB for
precision sequencing of four simultaneous
conversions and four conversions with small
delay required for CT compensation, up to 288
segment LCD driver and two blocks of 128
KB flash (256 KB total), independent RTC with
tamper detection providing more than 15 years
from CR2032 coin cell and more than 30 years
when powered by MCU, 32-bit MAC and AMR
SPI for 5V AMR interface. These features are
ideal for smart metering applications.
Fact Sheet
32-bit Microcontrollers
MCF51EM
Smart metering made easy with V1 ColdFire
®
MCU
MCF51EM Block Diagram
Power
Switch
Vmcu
Vbat
Independent
RTC
32 kHz
osc
Calendaring
Tamper Detect
AMR SCI
V1 ColdFire
®
MCU inc MAC LCD (1–8) x (43–36)
KB I 2 x SPI
SCISAR ADC
I
2
C
16/8K RAM AMR SPI16-bit CRC
4 x 16-bit
SAR ADC
Sequencer
(PDB)
1.2V ref
2 x Comparator
0–1.2V ref
2 x SCI
Robust FlashCore Clock
32 kHz/
1–16 MHz osc
Internal Clock Swap
64/128K
Flash
2-ch.
Timer/PWM
16-bit
Timer
2 x 8-bit
Timer
64/128K
Flash
BDM VREG GPIO
Clock Compensation
32B RAM
Atomic Counter
Alarms