mcf51em256 Freescale Semiconductor, Inc, mcf51em256 Datasheet - Page 6

• Manufacturer Part Number: mcf51em256
• Description: Microcontrollers Covers Mcf51em256 Mcf51em128
• Manufacturer: Freescale Semiconductor, Inc

MCF51EM256 Series Configurations
1.3
Table 2
6
ADC (analog-to-digital converter)
BDM (background debug module)
CF1 CORE (V1 ColdFire core) with MAC
unit
PRACMP1, PRACMP2 (comparators)
COP (computer operating poperly)
IRQ (interrupt request)
CRC (cyclic Redundancy Check)
DBG (debug)
FLASH (flash memory)
IIC (inter-integrated circuits)
INTC (interrupt controller)
KBI1 & KBI2
LCD
LVD (low voltage detect)
ICS (internal clock source)
IRTC (independent real-time clock)
VREF (voltage reference)
MTIM1, MTIM2 (modulo timers)
MTIM3 (modulo timer)
PDB (programmable delay block)
RAM (random-access memory)
RGPIO (rapid general-purpose
input/output)
describes the functional units of the MCF51EM256 series.
Features
Unit
MCF51EM256 Series ColdFire Microcontroller Data Sheet, Rev.3
Table 2. MCF51EM256 Series Functional Units
Preliminary—Subject to Change Without Notice
Measures analog voltages at up to 16 bits of resolution. Each ADC has
up to four differential and 24 single-ended inputs.
Provides single pin debugging interface (part of the V1 ColdFire core)
Executes programs, handles interrupts and containes
multiply-accumulate hardware (MAC).
Analog comparators for comparing external analog signals against
each other, or a variety of reference levels.
Software watchdog
Single pin high priority interrupt (part of the V1 ColdFire core)
High-speed CRC calculation
Provides debugging and emulation capabilities (part of the V1 ColdFire
core)
Provides storage for program code, constants and variables
Supports standard IIC communications protocol and SMBus
Controls and prioritizes all device interrupts
Keyboard Interfaces 1 and 2
Liquid crystal display driver
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
Provides clocking options for the device, including a three
frequency-locked loops (FLLs) for multiplying slower reference clock
sources
The independent real time clock provides an independent time-base
with optional interrupt, battery backup and tamper protection
The voltage reference output is available for both on and off-chip use
8-bit modulo timers with configurable clock inputs and interrupt
generation on overflow
16-bit modulo timer with configurable clock inputs and interrupt
generation on overflow
This timer is optimized for scheduling ADC conversions
Provides stack and variable storage
Allows for I/O port access at CPU clock speeds and is used to
implement GPIO functionality for PTA and PTB.
Function
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