NXP Semiconductors MC56F8255MLD

Overview

MC56F8255MLD from NXP Semiconductors (formerly Freescale) is a 60 MHz digital signal controller (DSC) integrating a 56800E DSP core with MCU functionality, 64 KB flash, 8 KB RAM, dual 12-bit ADCs (600 ns conversion), eFlexPWM with 6-channel 520 ps NanoEdge resolution, and MSCAN 2.0B interface - deployed in motor control for BLDC/PMSM drives and solar inverter power stage management.

For engineers reviewing the MC56F8255MLD datasheet, MC56F8255MLD pinout, MC56F8255MLD application, or MC56F8255MLD equivalent, key selection criteria include 44-pin LQFP package compatibility, 3.0–3.6 V single-supply operation, -40 °C to +105 °C temperature range, and support for LIN slave, QSPI, dual I²C, and hardware CRC-CCITT generation.

Technical Context

The MC56F8255MLD implements a modified Harvard architecture with three parallel execution units enabling up to six operations per instruction cycle, delivering 60 MIPS at 60 MHz core frequency. Its unified C-efficient instruction set supports both DSP math (single-cycle 16×16 MAC, four 36-bit accumulators) and real-time control tasks (hardware DO/REP loops, nested interrupts with five priority levels).

Peripherals are interconnected via a programmable inter-module crossbar (XBAR), allowing dynamic routing of ADC triggers to eFlexPWM, comparator outputs to timer inputs, and fault signals to PWM shutdown logic. The on-chip power supervisor integrates POR, LVI, brown-out reset, and a linear regulator - all operating from a single 3.0–3.6 V supply.

Key Specifications

Pinout & Package

MC56F8255MLD is housed in a 44-pin LQFP package measuring 10 mm × 10 mm with 0.8 mm pitch. Pin functions are multiplexed across GPIO, analog, PWM, serial, and debug domains, with all non-power/non-reset pins configurable as general-purpose I/O.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar digital signal controller applications.

Compared with MC56F8255MLD, MC56F8272MLH offers greater memory and connectivity but requires PCB redesign, while dsPIC33EP512MU810 delivers higher compute throughput and specialized motor interfaces at the cost of increased BOM complexity and toolchain divergence.

Availability

MC56F8255MLD is available at Aetrix Electronics and suitable for motor control, solar inverter, and industrial power supply designs requiring stable component supply, long-term lifecycle support, and automotive-qualified temperature range.

Supply support for MC56F8255MLD includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

NXP Semiconductors is a global semiconductor leader focused on secure connectivity solutions for automotive, industrial, and IoT applications, with deep heritage in microcontrollers and digital signal processing.

The MC56F8255MLD belongs to NXP's legacy 56800E-based DSC family, engineered specifically for cost-sensitive, high-efficiency digital power conversion and real-time motor control systems demanding tight integration of DSP performance and MCU flexibility.

FAQ

What is the maximum ADC sampling rate supported by the MC56F8255MLD?

The MC56F8255MLD supports a maximum ADC clock frequency of 10 MHz, enabling a minimum single-conversion time of 600 ns (6 ADC clock cycles). With dual 12-bit ADCs operating in parallel scan mode and hardware-triggered synchronization to eFlexPWM, the device achieves effective sampling rates exceeding 1.6 MSPS across 16 channels - sufficient for high-bandwidth current loop control in PMSM motor drives. This performance is sustained across the full –40 °C to +105 °C operating range.

Does the MC56F8255MLD support CAN communication?

Yes, the MC56F8255MLD integrates Freescale's scalable Controller Area Network (MSCAN) 2.0B module, compliant with ISO 11898-1 and supporting standard/extended frames at data rates up to 1 Mbit/s. It features five receive buffers and three transmit buffers, with built-in message filtering and error handling. The MSCAN peripheral is accessible on GPIOC11 (CANTX) and GPIOC12 (CANRX) pins in the 44-pin LQFP package, and operates independently of other serial interfaces.

What debug interfaces are available on the MC56F8255MLD?

The MC56F8255MLD provides IEEE 1149.1 JTAG and Enhanced On-Chip Emulator (EOnCE) interfaces via pins TCK, TDO, TDI, and TMS. These support real-time, non-intrusive debugging at full 60 MHz processor speed, including hardware breakpoints, watchpoints, and trace buffer capture. No external debug probe is required beyond standard JTAG-compliant tools such as PE Micro Cyclone or SEGGER J-Link, and the interface remains functional during all low-power modes except deep stop.

Can the MC56F8255MLD operate from a single 3.3 V supply?

Yes, the MC56F8255MLD is specified for single-supply operation from 3.0 V to 3.6 V, making 3.3 V its nominal and most commonly used supply voltage. The on-chip linear regulator powers both digital and analog circuitry, eliminating need for external LDOs. All I/O pins are 5 V tolerant, allowing safe interfacing with 5 V sensors and logic without level shifters - critical for industrial sensor fusion applications where mixed-voltage subsystems coexist.

How many PWM channels does the MC56F8255MLD support, and what is their resolution?

The MC56F8255MLD features the eFlexPWM module with up to nine output channels, of which six support NanoEdge high-resolution mode with 520 ps edge placement precision. Each channel supports center-aligned, edge-aligned, and asymmetrical PWM generation with independent top/bottom deadtime insertion, programmable polarity, and FORCE_OUT synchronization. PWM outputs are assigned to GPIOE0–GPIOE5 and GPIOC13, providing hardware-timed waveform generation without CPU intervention.