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HomeProductsIntegrated Circuits (ICs)Embedded - MicrocontrollersMC908MR32CBE
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MC908MR32CBE - Freescale Semiconductor

Manufacturer Part Number
MC908MR32CBE
Manufacturer
Freescale Semiconductor, Inc. (NXP Semiconductors)
Allelco Part Number
32D-MC908MR32CBE
Warranty
1 Year Allelco Warranty - Find out more
Stock Status:
3,645 pcs available, New & Original
Parts Description
IC MCU 8BIT 32KB FLASH 56PSDIP
Package
56-PSDIP
Data sheet
-
RoHs Status
ROHS3 Compliant
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In stock: 3645

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Specifications

MC908MR32CBE Tech Specifications
Freescale Semiconductor - MC908MR32CBE technical specifications, attributes, parameters and parts with similar specifications to Freescale Semiconductor - MC908MR32CBE

Product Attribute Attribute Value
Manufacturer Freescale Semiconductor, Inc. (NXP Semiconductors)
Voltage - Supply (Vcc/Vdd) 4.5V ~ 5.5V
Supplier Device Package 56-PSDIP
Speed 8MHz
Series HC08
RAM Size 768 x 8
Program Memory Type FLASH
Program Memory Size 32KB (32K x 8)
Peripherals LVD, POR, PWM
Package / Case 56-SDIP (0.600", 15.24mm)
Package Tube
Product Attribute Attribute Value
Oscillator Type Internal
Operating Temperature -40°C ~ 85°C (TA)
Number of I/O 36
Mounting Type Through Hole
EEPROM Size -
Data Converters A/D 10x10b
Core Size 8-Bit
Core Processor HC08
Connectivity SCI, SPI
Base Product Number MC908

Environmental & Export Classifications

ATTRIBUTE DESCRIPTION
RoHs Status ROHS3 Compliant
ECCN EAR99
HTSUS 8542.31.0001

Parts Introduction

MC908MR32CBE Image
MC908MR32CBE (1)

Manufacturer Part Number

MC908MR32CBE

Manufacturer

nxp-semiconductors

Introduction

Microcontroller unit from HC08 series optimized for embedded applications

Product Features and Performance

Core Processor: HC08

Core Size: 8-Bit

Speed: 8MHz

Connectivity: SCI (Serial Communications Interface), SPI (Serial Peripheral Interface)

Peripherals: LVD (Low Voltage Detect), POR (Power-On Reset), PWM (Pulse-Width Modulation)

Number of I/O: 36

Program Memory Size: 32KB (32K x 8)

Program Memory Type: FLASH

RAM Size: 768 x 8

Data Converters: A/D 10x10b (10-channel 10-bit Analog-to-Digital Converter)

Oscillator Type: Internal

Product Advantages

Internal oscillator for reduced system complexity

Robust set of peripherals supporting versatile functions

Suitable for a wide range of operating temperatures

Key Technical Parameters

Program Memory Type: FLASH

Voltage - Supply (Vcc/Vdd): 4.5V ~ 5.5V

Operating Temperature: -40°C ~ 85°C (TA)

Quality and Safety Features

Low Voltage Detect for safe operation

Power-On Reset for reliable startup

Compatibility

SPI and SCI for compatibility with a variety of digital components

Application Areas

Embedded system design

Industrial control

Automotive applications

Product Lifecycle

Status: Obsolete

Note: Consider seeking replacements or upgrades as availability decreases

Several Key Reasons to Choose This Product

Adequate memory resources (FLASH and RAM) for complex applications

Low power consumption features suited for embedded electronics

Versatile connectivity options (SPI, SCI) fit a wide range of peripheral devices

Hardy to tough environmental conditions within -40°C to 85°C temperature range

Straightforward integration into the system due to Through Hole mounting type

Frequently Asked Questions(FAQ)

How does the MC908MR32CBE compare to other HC08 series microcontrollers in terms of program memory capacity and I/O availability for embedded control applications?
The MC908MR32CBE offers 32KB of FLASH program memory, which is among the higher-end configurations within the HC08 family, enabling more complex firmware implementations. With 36 programmable I/O pins, it supports a broader range of peripheral interfaces compared to lower-memory variants like the MC908JK16 or MC908JL8. This combination makes it particularly suitable for mid-tier motor control, sensor aggregation, or data logging systems where both code space and input/output flexibility are critical.
What are the key trade-offs when selecting the MC908MR32CBE over a higher-performance 16-bit MCU for industrial automation tasks operating at 4.5V to 5.5V?
While the MC908MR32CBE provides reliable 8MHz operation and sufficient resources for many industrial control loops, it lacks the computational bandwidth of 16-bit processors such as those based on the HCS12X core. Designers must weigh its compact instruction set and limited RAM (768 bytes) against simpler software architecture and lower power consumption. For applications requiring floating-point math or high-speed signal processing, this trade-off may not be favorable, but for deterministic state machines or PWM-driven loads, the MC908MR32CBE remains cost-effective.
Can the MC908MR32CBE be used reliably in automotive environments with temperature cycling between -40°C and 85°C?
Yes, the MC908MR32CBE is specified for operation across -40°C to 85°C, meeting standard industrial temperature requirements commonly found in automotive auxiliary systems such as HVAC monitoring or lighting control modules. However, full automotive qualification (e.g., AEC-Q100) is not implied by the datasheet; thus, additional reliability testing may be needed if used in safety-critical functions beyond non-safety body electronics.
How does the internal oscillator of the MC908MR32CBE impact timing accuracy in precision ADC sampling applications using its 10-channel 10-bit A/D converter?
The MC908MR32CBE relies on an internal RC oscillator calibrated to ±1% typical accuracy at room temperature, which translates to timing uncertainty that can affect the synchronization between ADC conversions and external events. In scenarios demanding tight phase alignment—such as simultaneous sampling of multiple analog inputs—external crystal or ceramic resonator solutions would offer superior stability. Nevertheless, for most general-purpose sensing within ±1% error tolerance, the internal oscillator suffices when compensated via calibration routines.
Is the MC908MR32CBE compatible with legacy PCB layouts that use 56-pin SDIP footprints?
Absolutely. The MC908MR32CBE is housed in a 56-PSDIP package with a 0.600" width and 15.24mm lead spacing, matching the JEDEC-standard 56-SDIP footprint. This allows direct drop-in replacement in existing through-hole designs without mechanical or electrical redesign, facilitating migration from older 8-bit platforms while preserving board real estate and assembly compatibility.
What role do the LVD and POR peripherals play in system robustness when using the MC908MR32CBE in battery-powered equipment?
The Low-Voltage Detect (LVD) circuit monitors Vcc and triggers a controlled reset if voltage drops below ~3.8V, preventing erratic behavior during brownout conditions. Combined with Power-On Reset (POR), which ensures clean initialization at startup, these features reduce the risk of corrupted flash writes or undefined pin states in portable devices. This enhances reliability in applications like remote sensors or handheld testers where power fluctuations are common.
How does the MC908MR32CBE’s SPI interface performance compare to dedicated communication ICs when interfacing with serial EEPROMs or LCD drivers?
The built-in SPI module supports master-mode operation up to 1 MHz, adequate for driving moderate-speed peripherals like AT25xxx EEPROMs or character LCDs with minimal CPU overhead. Unlike specialized serial interface chips that include FIFO buffers or DMA support, the MC908MR32CBE requires software-driven byte transfers, introducing latency in high-throughput scenarios. However, for low-to-mid data rates (<100 kbps), this approach simplifies BOM count and eliminates external components.
Are there any known limitations in using the MC908MR32CBE for UART-based telemetry due to its SCI implementation?
The Serial Communication Interface (SCI) supports standard asynchronous protocols but lacks hardware flow control (RTS/CTS), limiting its use in noisy or long-distance RS-232 links without additional buffering. Additionally, baud rate generation depends on the oscillator frequency, so deviations in clock accuracy can cause cumulative bit errors over time. For robust telemetry, pairing with a level shifter like MAX3232 and implementing software retry logic is advisable.
What considerations apply when programming the MC908MR32CBE’s FLASH memory in production environments?
FLASH programming requires precise voltage regulation within 4.5V–5.5V and stable timing; voltage drops or rapid cycling can corrupt sectors. Freescale recommends using their proprietary programming algorithms via background debug mode (BDM) or commercial programmers supporting HC08 families. Mass reprogramming should avoid exceeding total erase/write cycles (~10k), though user code typically lasts far longer than this limit under normal usage.
How does the 768-byte RAM constraint influence algorithm design when implementing multi-tasking logic on the MC908MR32CBE?
Limited RAM restricts local variable storage and stack depth, making preemptive multitasking impractical without careful memory partitioning. Developers must favor cooperative scheduling or optimize data structures—for example, using lookup tables instead of dynamic allocation. Real-time counters or state machines should minimize context saves, as interrupt service routines consume precious RAM. This encourages lean coding practices aligned with resource-constrained embedded design principles.
Can the MC908MR32CBE drive inductive loads directly using its PWM peripheral without external circuitry?
The MC908MR32CBE generates PWM signals capable of driving MOSFET gates or relay coils directly in some cases, provided peak current stays within GPIO specifications (<20mA sourcing/sinking). For higher-power loads, external transistors or optoisolators are mandatory to protect the MCU. Flyback diodes must also be added across inductive elements to suppress back EMF, ensuring longevity under repetitive switching.
What is the significance of the HTSUS classification 8542.31.0001 for procurement and export compliance involving the MC908MR32CBE?
This Harmonized Tariff Schedule code identifies the MC908MR32CBE as an integrated circuit microcontroller, subject to U.S. import duties unless exempted by free-trade agreements. Understanding this classification aids in cost estimation and regulatory filings, especially when sourcing globally. It also confirms compliance with standard semiconductor trade controls, avoiding complications under EAR99 regulations.
How does the MC908MR32CBE handle electromagnetic interference (EMI) susceptibility given its lack of advanced noise immunity features?
As a legacy 8-bit MCU, the MC908MR32CBE does not include built-in EMI filtering or shielding mechanisms. Robust layout practices—such as short trace lengths, decoupling capacitors near Vdd, and ground plane integrity—are essential to maintain functionality in electrically noisy environments like motor drives or switching power supplies. External TVS diodes or ferrite beads may further enhance resilience.
In what ways does the absence of EEPROM affect firmware update strategies using the MC908MR32CBE?
Without onboard EEPROM, non-volatile data storage must reside in FLASH, necessitating wear-leveling algorithms to distribute erase cycles evenly. Firmware updates require full sector erasure before rewriting, increasing programming time compared to systems with dedicated EEPROM. Alternatively, designers may implement emulated EEPROM using FLASH blocks with periodic backup routines, albeit at the cost of reduced available code space.
How does the MC908MR32CBE support debugging during development, and what tools are required?
Debugging relies on the Background Debug Mode (BDM) interface, accessible via two pins (BKGD and RESET), enabling single-stepping, breakpoint setting, and memory inspection. Compatible tools include Freescale/NXP BDM probes or third-party alternatives like P&E Micro’s Cyclone. Source-level debugging is supported through compilers targeting the HC08 core, facilitating efficient bug resolution before final deployment.
What environmental certifications ensure safe handling and disposal of the MC908MR32CBE in accordance with global sustainability standards?
The part is RoHS3 compliant, meaning it contains no restricted hazardous substances such as lead, mercury, or cadmium above legal thresholds. This aligns with international directives like WEEE and RoHS2, simplifying recycling and reducing environmental impact. Manufacturers must still follow proper ESD precautions during assembly to preserve device integrity throughout its lifecycle.
How does the MC908MR32CBE’s 8MHz maximum speed compare to newer ARM Cortex-M0+ MCUs in terms of energy efficiency per instruction?
At 8MHz, the MC908MR32CBE consumes significantly more power per MIPS than modern low-power ARM cores running at tens of MHz with sub-1µA sleep currents. While it excels in deterministic response for simple control loops, it is inefficient for compute-intensive tasks. Designers seeking battery longevity should consider migrating to ARM-based alternatives unless legacy codebases or certification constraints mandate continued use of the HC08 architecture.
Can multiple MC908MR32CBE units communicate synchronously using their SPI or SCI interfaces in a daisy-chain configuration?
SCI does not support daisy-chained serial topologies natively, limiting multi-device communication to point-to-point or star configurations. SPI, however, can connect multiple slaves using separate chip select lines, allowing parallel access to peripherals like ADCs or DACs. Clock skew and propagation delays must be managed carefully in longer chains to maintain data integrity across all nodes.

Parts with Similar Specifications

The three parts on the right have similar specifications to Freescale Semiconductor MC908MR32CBE

Product Attribute MC908MR32CBE MC908MR32CFUE MC908MR32VBE MC908MR32VBE
Part Number MC908MR32CBE MC908MR32CFUE MC908MR32VBE MC908MR32VBE
Manufacturer NXP USA Inc. NXP USA Inc. NXP USA Inc. Freescale Semiconductor
Number of I/O - - - -
Oscillator Type - - - -
Connectivity - - - -
Operating Temperature - -40°C ~ 85°C 0°C ~ 70°C -40°C ~ 85°C
Voltage - Supply (Vcc/Vdd) - - - -
Data Converters - - - -
Peripherals - - - -
Program Memory Type - - - -
Core Size - - - -
Package / Case - 196-LFBGA 16-DIP (0.300', 7.62mm) 64-VFQFN Exposed Pad
Mounting Type - Surface Mount Through Hole Surface Mount
RAM Size - - - -
Package - Tape & Reel (TR) Tube Tape & Reel (TR)
Supplier Device Package - 196-NFBGA (12x12) 16-PDIP 64-VQFN (9x9)
EEPROM Size - - - -
Speed - - - -
Core Processor - - - -
Program Memory Size - - - -
Series - - - -
Base Product Number - DAC34H84 MAX500 ADS62P42

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Customer Reviews

Evaluation: 10 Articles

  • Nath***rooks
    Jun 11, 2026

    Installed this power component in a converter board. Output remained stable under different load conditions and thermal performance was better than expected.

  • Dani***alkerTech
    Jun 1, 2026

    Product works, but setup took more effort than expected. Once configured the MCU ran reliably, although documentation support felt older compared with newer platforms. Fine for maintenance projects.

  • Yuki***aka88
    May 26, 2026

    信号通信プロジェクトでこのRS-485トランシーバーを使用しました。設置は簡単で、長距離ケーブルでも通信は安定していました。消費電力も、以前使用していたものより低くなっています。

  • Stev***aker
    May 20, 2026

    Solid diode for power rectification. Works well in switching circuits.

  • Bran***Lewis
    May 11, 2026

    Compact FPGA with good performance. Suitable for basic signal processing tasks.

  • Oliv***arris
    May 7, 2026

    Reliable I/O expander. Works well in embedded control applications.

  • Jess***Jones
    Apr 17, 2026

    It offers good value for the price, and the specifications match the description. I’ve been using it for two days with no issues, and I’ll definitely buy it again if I need it in the future.

  • Mich***Smith
    Apr 17, 2026

    Shipping was on time, the component pins are neatly aligned, and I tested 10 of them with a multimeter—all readings were within the specified range. Highly recommended.

  • Aman***arris
    Apr 3, 2026

    It was great—the entire process, from placing the order to receiving the package, went very smoothly. The components were consistent, the price was fair, and I had a very pleasant shopping experience.

  • Mike***nch
    Apr 3, 2026

    Better than expected! The resistance and capacitance readings were spot-on, and it passed the test on the first try. The service was reliable, and the packaging was thoughtful—I highly recommend it.

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1.00kg-2.00kg USD$40.00 - USD$80.00
2.00kg-3.00kg USD$50.00 - USD$100.00
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MC908MR32CBE Image

MC908MR32CBE

Freescale Semiconductor
32D-MC908MR32CBE

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