NXP Semiconductors MC908MR16CBE

Overview

MC908MR16CBE from Freescale Semiconductor is an 8-bit HCS08 microcontroller featuring 16 KB on-chip FLASH memory, 512 B RAM, and integrated motor control peripherals including a six-channel PWM module with dead-time insertion and complementary output support. It includes a 10-bit ADC with up to 12 input channels, dual timer interfaces (TIMA/TIMB), SCI and SPI serial modules, and operates from 2.7–5.5 V supply across –40°C to +85°C industrial temperature range.

For engineers reviewing the MC908MR16CBE datasheet, MC908MR16CBE pinout, MC908MR16CBE application, or MC908MR16CBE equivalent, this page delivers verified technical context, package mapping, real-world use cases in BLDC motor drives and industrial actuation, and validated alternative options for design continuity.

Technical Context

The MC908MR16CBE implements the HCS08 CPU core with enhanced addressing modes and interrupt handling optimized for deterministic motor timing. Its Pulse-Width Modulator for Motor Control (PWMMC) supports both independent and complementary PWM outputs with programmable dead-time and top/bottom correction based on motor phase current polarity sensing.

The Clock Generator Module integrates a crystal oscillator and PLL for precise clock synthesis, enabling stable operation at up to 20 MHz core frequency. The ADC subsystem provides configurable sample rates and result justification, while the System Integration Module (SIM) coordinates COP watchdog, LVI, POR, and interrupt vector management.

Key Specifications

Pinout & Package

MC908MR16CBE is housed in a 64-pin QFP (Quad Flat Package) with 0.5 mm pitch, compliant with JEDEC MO-137AB. The package supports surface-mount assembly and thermal dissipation up to 1.2 W in typical motor control duty cycles.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar motor control microcontroller applications.

Compared with MC908MR32CFA, the MC908MR16CBE offers identical peripheral functionality at lower memory cost, while S9KEAZ128AMLH provides architectural modernization at the expense of software migration effort and increased BOM cost.

Availability

MC908MR16CBE is available at Aetrix Electronics and suitable for brushless DC motor drives, industrial valve actuators, smart power tools, and conveyor belt speed regulators requiring stable component supply and long-term industrial lifecycle support.

Supply support for MC908MR16CBE 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

Freescale Semiconductor (now part of NXP Semiconductors) is a global leader in embedded processing solutions, specializing in automotive, industrial, and networking microcontrollers.

The MC908MR16CBE belongs to the HCS08 family, designed specifically for cost-sensitive, high-reliability motor control applications requiring integrated PWM, ADC, and robust system supervision features.

FAQ

What is the maximum operating frequency of the MC908MR16CBE?

The MC908MR16CBE supports a maximum core frequency of 20 MHz, achieved via its integrated PLL-based Clock Generator Module. This frequency is sustained across the full –40°C to +85°C temperature range and 2.7–5.5 V supply voltage, enabling deterministic execution of motor control loops with sub-microsecond timing resolution. The PLL allows flexible clock synthesis from low-frequency crystals, reducing EMI compared to direct high-frequency oscillators.

Does the MC908MR16CBE support in-system programming of its FLASH memory?

Yes, the MC908MR16CBE supports in-system programming (ISP) of its 16 KB FLASH memory using the on-chip monitor ROM and standard SCI interface. This capability enables field firmware updates without removing the device from the PCB. Programming requires only a UART connection and adheres to Freescale's documented protocol; no external programmer hardware is needed for basic reprogramming tasks involving the MC908MR16CBE.

How many analog input channels does the ADC in the MC908MR16CBE support?

The MC908MR16CBE integrates a 10-bit ADC with up to 12 analog input channels, accessible through Port B (PTB0–PTB7/ATD0–ATD7), Port C (PTC0/ATD8, PTC1/ATD9), and dedicated ADC pins (VREFH, VREFL). Channel selection is software-controlled via the ADC Status and Control Register, and the module supports single-ended or differential input configurations depending on external circuitry connected to the MC908MR16CBE.

What safety features are built into the MC908MR16CBE for motor control applications?

The MC908MR16CBE includes multiple hardware-level safety features: Computer Operating Properly (COP) watchdog timer with configurable timeout, Low-Voltage Inhibit (LVI) circuit that forces reset below programmable thresholds (e.g., 2.5 V), and dedicated fault input pins (FAULT1–FAULT4) tied directly to the PWMMC module for immediate PWM shutdown during overcurrent or thermal events. These features operate independently of software execution, ensuring fail-safe behavior in the MC908MR16CBE even during code lockup or supply anomaly.

Is the MC908MR16CBE pin-compatible with other devices in the MR-series family?

Yes, the MC908MR16CBE shares identical pinout and package (64-pin QFP) with the MC908MR32CFA and MC908MR32CBE variants. This allows direct substitution between 16 KB and 32 KB FLASH versions without PCB redesign. All MR-series devices maintain consistent peripheral register mapping, interrupt vectors, and electrical characteristics, enabling scalable firmware development across the MC908MR16CBE and higher-memory variants.