NXP Semiconductors MC56F8256MLF

Overview

MC56F8256MLF from NXP Semiconductors (formerly Freescale) is a 60 MHz digital signal controller (DSC) built on the 56800E core, integrating DSP processing power and microcontroller functionality. It features 64 KB flash, 8 KB RAM, dual 12-bit ADCs with ×1/×2/×4 programmable gain, six-channel NanoEdge PWM (520 ps resolution), and operates from 3.0–3.6 V across –40 °C to +105 °C. It is used in PMSM servo motor control and phase-shifted DC-DC converters.

For engineers reviewing the MC56F8256MLF datasheet, MC56F8256MLF pinout, MC56F8256MLF application, or MC56F8256MLF equivalent, key selection considerations include its eFlexPWM fault handling capability, dual ADC synchronization with PWM via crossbar, 12-bit DAC output routing, MSCAN 2.0B compliance, and 54 GPIOs with 5 V tolerance.

Technical Context

The MC56F8256MLF implements a dual-Harvard 56800E core delivering up to 60 MIPS, with three parallel execution units enabling six operations per instruction cycle. Its memory architecture supports simultaneous program and data access, and it includes an integrated PLL for core/peripheral clock generation plus on-chip relaxation oscillator (8 MHz / 400 kHz).

Peripheral integration centers on the eFlexPWM module-supporting nine PWM outputs, six with NanoEdge edge placement (520 ps resolution), independent deadtime control per complementary pair, and four assignable fault inputs-and dual 12-bit ADCs capable of 600 ns conversion time with programmable gain amplifiers and crossbar-triggered sampling.

Key Specifications

Pinout & Package

MC56F8256MLF is housed in a 48-pin LQFP package (7 mm × 7 mm, 0.5 mm pitch) with exposed thermal pad. Pin functions are defined by configuration registers and crossbar routing; no fixed hardware pin-to-function mapping exists without software initialization.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MC56F8257MLF, MC56F8256MLF trades input-capture PWM channels for smaller 48-pin LQFP packaging and lower cost, while retaining identical flash/RAM, NanoEdge PWM, and MSCAN capability. Against MC56F8247VLH, MC56F8256MLF adds CAN 2.0B, second QSCI, and 16 KB more flash-critical for complex control firmware and industrial networking.

Availability

MC56F8256MLF is available at Aetrix Electronics and suitable for industrial motor control, digital power conversion, smart sensor hubs, and battery management systems requiring stable component supply, long-term lifecycle support, and automotive-grade temperature operation.

Supply support for MC56F8256MLF 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.

The MC56F8256MLF belongs to NXP's legacy DSC portfolio derived from Freescale's 56800E-based controllers, designed specifically for cost-sensitive, high-performance real-time control in motor drives and power electronics.

FAQ

What is the maximum operating frequency of the MC56F8256MLF core?

The MC56F8256MLF core operates at a maximum frequency of 60 MHz, delivering up to 60 million instructions per second (MIPS). This frequency is achieved using the on-chip PLL locked to either the internal 8 MHz relaxation oscillator or an external crystal source. The MC56F8256MLF maintains deterministic real-time performance across its full operating temperature range of –40 °C to +105 °C.

Does the MC56F8256MLF support CAN bus communication?

Yes, the MC56F8256MLF integrates a Freescale Scalable Controller Area Network (MSCAN) 2.0B module compliant with ISO 11898-1, supporting both standard and extended data frames at bit rates up to 1 Mbps. It includes five receive buffers and three transmit buffers, making the MC56F8256MLF suitable for industrial automation and distributed motor control networks requiring robust fieldbus communication.

How many analog-to-digital converters does the MC56F8256MLF include, and what are their key capabilities?

The MC56F8256MLF includes two independent 12-bit analog-to-digital converters (ADCs), each with eight external input channels. Both ADCs feature programmable gain amplifiers (×1, ×2, ×4), conversion times as short as 600 ns, and support for sequential, parallel, and independent scan modes. Their conversions can be triggered synchronously by eFlexPWM or timer modules via the inter-module crossbar, which is essential for accurate current sensing in motor control applications using the MC56F8256MLF.

What PWM resolution does the MC56F8256MLF provide, and how is it implemented?

The MC56F8256MLF provides NanoEdge PWM resolution of 520 ps through its eFlexPWM module's fractional delay capability, enabling arbitrary edge placement within the PWM period. This is implemented via dedicated hardware logic that interpolates between base clock cycles, allowing sub-nanosecond timing control without increasing core clock frequency. Six of the nine PWM channels on the MC56F8256MLF support this high-resolution mode, critical for minimizing acoustic noise and optimizing efficiency in inverter-driven motors.

Is the MC56F8256MLF pin-compatible with other members of the MC56F825x family?

No, the MC56F8256MLF is not pin-compatible with other MC56F825x variants due to differing package footprints: MC56F8256MLF uses a 48-pin LQFP, while MC56F8255MLF and MC56F8257MLF use 44-pin and 64-pin LQFP packages respectively. Although functional peripherals are consistent across the family, PCB layout must be redesigned when substituting between these variants. The MC56F8256MLF shares the same 48-pin LQFP footprint only with MC56F8246VLH and MC56F8255MLF, but those differ in flash size and peripheral configuration.