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MCF51EM256CLK Datasheet(PDF) 6 Page - Freescale Semiconductor, Inc |
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MCF51EM256CLK Datasheet(HTML) 6 Page - Freescale Semiconductor, Inc |
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6 / 54 page  MCF51EM256 Series ColdFire Microcontroller Data Sheet, Rev.2 Preliminary—Subject to Change Without Notice MCF51EM256 Series Configurations Freescale Semiconductor 6 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 unit Executes programs, handles interrupts and containes 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. |
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