NXP Semiconductors MC908MR16CFUE

Overview

MC908MR16CFUE from Freescale Semiconductor is an 8-bit HCS08 microcontroller with 16 KB on-chip FLASH, 512 B RAM, and integrated motor control PWM (6-channel complementary), 10-bit ADC (12-channel), and PLL-based clock generation. It operates at up to 40 MHz core frequency and targets embedded motor drive applications requiring real-time phase current sensing and dead-time control.

For engineers reviewing the MC908MR16CFUE datasheet, MC908MR16CFUE pinout, MC908MR16CFUE application, or MC908MR16CFUE equivalent, key selection criteria include its dedicated PWMMC module with top/bottom correction, VDDAD/VSSAD analog supply separation, FLBPR-based FLASH protection, and IRQ-triggered monitor mode entry - all critical for industrial BLDC/PMSM inverter designs.

Technical Context

The MC908MR16CFUE implements the HCS08 CPU core with enhanced addressing modes and a 16-level hardware stack. Its System Integration Module (SIM) integrates a PLL with programmable bandwidth, CGMOUT clock output, and COP watchdog with configurable timeout.

The Pulse-Width Modulator for Motor Control (PWMMC) supports six independent PWM outputs or three complementary pairs with user-configurable dead-time insertion, fault input mapping (PTD3–PTD0), and automatic top/bottom correction based on motor phase current polarity sensing via ADC inputs.

Key Specifications

Pinout & Package

MC908MR16CFUE is housed in a 64-pin QFP (Quad Flat Package) with 0.5 mm pitch, compliant with JEDEC MS-026. The package provides full I/O access including dedicated motor control pins, analog inputs, and PLL support signals.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MC908MR32CFUE, the MC908MR16CFUE offers identical peripherals and timing performance but reduced FLASH capacity for cost-sensitive single-motor applications; versus S9KEAZ128AMLH, it delivers deterministic 8-bit real-time response with lower power and simpler toolchain requirements.

Availability

MC908MR16CFUE is available at Aetrix Electronics and suitable for industrial motor drives, HVAC blower systems, and appliance inverter modules requiring stable component supply and long-term production continuity.

Supply support for MC908MR16CFUE 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 MC908MR16CFUE belongs to the HCS08 MR-series, designed specifically for cost-effective, high-reliability motor control in appliances and industrial equipment where integrated PWM, ADC, and fault handling are essential.

FAQ

What is the maximum operating frequency of the MC908MR16CFUE?

The MC908MR16CFUE achieves a maximum core frequency of 40 MHz using its on-chip PLL, which accepts a 1–8 MHz crystal input on OSC1/OSC2. The PLL's bandwidth and lock time are configured via CGM registers and tuned using the external CGMXFC capacitor. This frequency enables sub-microsecond PWM update intervals required for high-pole-count BLDC motors.

Does the MC908MR16CFUE support in-circuit debugging without external hardware?

Yes, the MC908MR16CFUE supports monitor mode entry via the IRQ pin or PTA7, enabling in-circuit debugging and flash programming without a dedicated external debugger. Monitor mode provides access to memory and registers through a serial interface using the SCI module, and is activated by asserting IRQ while holding RESET low - a capability confirmed in Section 18 of the official datasheet.

How many ADC channels does the MC908MR16CFUE have, and what is their resolution?

The MC908MR16CFUE integrates a 10-bit successive approximation ADC with 12 total input channels: ATD0–ATD7 mapped to PTB0–PTB7, and ATD8–ATD9 mapped to PTC0–PTC1. Conversion time is programmable down to 6 µs per sample, and results are stored in 16-bit data registers (ADRH/ADRL) with left-justified or right-justified alignment selectable via ADCSC1.

What PWM configurations are supported by the PWMMC module in the MC908MR16CFUE?

The PWMMC module in the MC908MR16CFUE supports two primary configurations: six independent PWM outputs (PWM1–PWM6) or three complementary PWM pairs (e.g., PWM1/PWM2 as high-side/low-side). Complementary mode includes programmable dead-time insertion and automatic top/bottom correction triggered by ADC-measured current polarity - features explicitly documented in Chapter 12 of the datasheet.

Is the MC908MR16CFUE pin-compatible with other members of the MR-series?

Yes, the MC908MR16CFUE shares the same 64-pin QFP package and pinout with the MC908MR32CFUE, differing only in FLASH size (16 KB vs. 32 KB) and part marking. All peripheral signals, power domains, and fault/ADC mappings are identical, enabling direct hardware reuse across variants - a compatibility verified in the "Pin Assignments" section (Section 1.4) and mechanical specifications (Chapter 20) of the datasheet.