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HomeProductsIntegrated Circuits (ICs)Embedded - MicrocontrollersMC908MR32VBE
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MC908MR32VBE - Freescale Semiconductor

Manufacturer Part Number
MC908MR32VBE
Manufacturer
Freescale Semiconductor, Inc. (NXP Semiconductors)
Allelco Part Number
32D-MC908MR32VBE
Warranty
1 Year Allelco Warranty - Find out more
Stock Status:
4,040 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: 4040

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Specifications

MC908MR32VBE Tech Specifications
Freescale Semiconductor - MC908MR32VBE technical specifications, attributes, parameters and parts with similar specifications to Freescale Semiconductor - MC908MR32VBE

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 Bulk
Product Attribute Attribute Value
Oscillator Type Internal
Operating Temperature -40°C ~ 105°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
Moisture Sensitivity Level (MSL) 3 (168 Hours)
REACH Status Vendor Undefined
ECCN EAR99
HTSUS 8542.31.0001

Frequently Asked Questions(FAQ)

What are the key differences between the MC908MR32VBE and other HC08 family microcontrollers when selecting for a low-power embedded application with limited supply voltage tolerance?
The MC908MR32VBE operates within a supply voltage range of 4.5V to 5.5V, which is narrower than some variants that support wider ranges, making it less suitable for applications exposed to significant voltage fluctuations. Its internal oscillator runs at up to 8MHz, providing sufficient performance without requiring external timing components, which reduces system complexity and power consumption. Compared to higher-memory HC08 models, this device offers 32KB of flash memory, which may be limiting in data-intensive applications but aligns well with cost-sensitive designs where moderate code size suffices. When evaluating alternatives, designers must weigh the trade-off between memory capacity and power efficiency—this MCU’s fixed-voltage requirement simplifies regulation but limits deployment in battery-powered systems unless a stable 5V source is guaranteed.
How does the MC908MR32VBE compare to ARM-based microcontrollers in terms of real-time performance and peripheral integration for industrial sensor monitoring?
The MC908MR32VBE delivers deterministic real-time response typical of 8-bit architectures, with interrupt latency and execution speed well-suited for simple control loops and polling routines common in sensor monitoring. While it lacks the computational throughput of ARM cores, its integrated peripherals—including 10-channel 10-bit ADC, SPI, SCI, PWM, LVD, and POR—provide sufficient functionality for basic data acquisition and communication without external ICs. In contrast, ARM MCUs offer greater processing headroom for signal processing or protocol handling but at higher power and cost. For lightweight industrial monitoring where data rates are modest and system simplicity is prioritized, the MC908MR32VBE can be more efficient due to lower overhead and reduced component count.
Can the MC908MR32VBE be used in automotive-grade temperature environments without additional thermal management?
Yes, the MC908MR32VBE is rated for operation from -40°C to +105°C, meeting stringent automotive and industrial environmental standards. This wide operating temperature range eliminates the need for external cooling or thermal buffering in many harsh-condition applications. However, PCB layout and component selection should still follow best practices to avoid localized hotspots or condensation risks near joints. The internal oscillator stability across this range ensures reliable timing without calibration, supporting consistent performance in engine control modules, HVAC systems, or remote sensors where ambient temperatures fluctuate significantly.
What considerations apply when interfacing the MC908MR32VBE with modern digital sensors requiring I²C communication?
Although the MC908MR32VBE includes SCI and SPI peripherals, it does not natively support I²C, which is commonly used by digital sensors like Bosch BMP280 or TI TMP102. To interface such sensors, an external I²C-to-SPI bridge or bit-banged software implementation using GPIO pins becomes necessary, increasing CPU load and reducing available cycles for other tasks. Given the MCU’s limited RAM (768 x 8 bytes), implementing bit-banging efficiently requires careful coding to avoid timing errors. Designers should evaluate whether the added software complexity outweighs the benefits of using a non-I²C-native MCU, especially compared to devices with built-in I²C support.
Is the MC908MR32VBE suitable for battery-operated portable devices requiring extended runtime?
The MC908MR32VBE is not ideal for ultra-low-power battery applications due to its relatively high quiescent current and fixed 4.5–5.5V operating range. Most portable devices operate at 3.3V or lower, necessitating a boost or linear regulator to step up from a single-cell Li-ion or alkaline battery—introducing inefficiency and additional components. While the MCU features Power-on Reset (POR) and Low Voltage Detection (LVD), it lacks deep sleep modes found in modern low-power MCUs. Therefore, unless the system maintains a stable 5V rail (e.g., via USB), the energy cost of regulation and the MCU’s active power draw make it suboptimal for long-term battery life.
How does flash memory programming endurance impact lifecycle reliability when using the MC908MR32VBE in field-upgradable firmware systems?
The MC908MR32VBE uses standard NOR-type flash memory with typical write/erase cycles around 10,000 operations per sector—adequate for most firmware update scenarios. However, frequent over-the-air updates or configuration changes in deployed units could accelerate wear. Designers should implement wear-leveling algorithms if flash writes occur regularly beyond factory programming. Additionally, erase operations take longer than writes, so minimizing unnecessary full-sector erasures improves responsiveness. For field-upgradable systems, it’s advisable to reserve dedicated configuration storage in EEPROM (if available) or use external FRAM to reduce flash cycling, though this MCU lacks internal EEPROM.
What is the maximum achievable data rate using the SPI peripheral on the MC908MR32VBE?
With an internal clock of up to 8MHz, the MC908MR32VBE’s SPI peripheral can theoretically achieve data rates near 8 Mbps in master mode. However, practical throughput depends on bus loading, cable capacitance, and slave device timing margins. At full speed, signal integrity issues may require shorter traces or level shifting. In comparison to newer MCUs supporting faster SPI modes (e.g., Quad SPI), this device remains adequate for interfacing with legacy sensors or displays but may bottleneck high-speed data streams like image capture or real-time logging.
How does the package choice affect board layout density when integrating the MC908MR32VBE into compact industrial controllers?
The MC908MR32VBE comes in a 56-pin PSDIP package with a 0.6-inch width, which occupies more board space than surface-mount alternatives like QFN or SOIC. This through-hole format demands dual-sided assembly and increases mechanical profile, challenging integration into miniaturized enclosures. While the pinout provides generous spacing for hand-soldering and prototyping, automated PCB production may incur higher costs. For dense designs, migrating to a smaller footprint variant—if available—or redistributing components vertically could mitigate space constraints, though this requires revalidation of thermal and mechanical stress under vibration or thermal cycling.
Are there any known limitations in debugging or in-circuit programming when using tools with the MC908MR32VBE?
The MC908 architecture is supported by several legacy debuggers and programmers, including Freescale CodeWarrior and third-party tools compatible with the background debug mode (BDM). However, newer JTAG-based debuggers may lack native support, requiring adapters or firmware updates. Programming speed is moderate compared to modern interfaces, and flash programming can take seconds per block, affecting development iteration time. Additionally, certain protected memory areas cannot be read back after code protection is enabled, posing risks in production environments if not managed carefully during initial bring-up.
What role does the internal ADC play in analog sensor conditioning circuits designed around the MC908MR32VBE?
The MC908MR32VBE integrates a 10-bit successive approximation ADC with 10 input channels, enabling direct digitization of analog signals from thermistors, pressure transducers, or potentiometers without external ADCs. While 10-bit resolution is sufficient for coarse measurements like temperature or position feedback, it may lack precision for fine-grained analog processing. Signal conditioning—such as amplification, filtering, and reference stabilization—remains critical to ensure accuracy within ±1 LSB. Designers should account for the ADC’s sampling time and conversion rate when synchronizing with other peripherals to avoid contention or missed readings.

Parts with Similar Specifications

The three parts on the right have similar specifications to Freescale Semiconductor MC908MR32VBE

Product Attribute MC908MR32VBE MC908MR32CBE MC908MR32VFUE MC908MR32VFUE
Part Number MC908MR32VBE MC908MR32CBE MC908MR32VFUE MC908MR32VFUE
Manufacturer NXP USA Inc. Freescale Semiconductor NXP USA Inc. Freescale Semiconductor
Base Product Number - DAC34H84 MAX500 ADS62P42
Mounting Type - Surface Mount Through Hole Surface Mount
Program Memory Size - - - -
Data Converters - - - -
EEPROM Size - - - -
Supplier Device Package - 196-NFBGA (12x12) 16-PDIP 64-VQFN (9x9)
Voltage - Supply (Vcc/Vdd) - - - -
Peripherals - - - -
Core Processor - - - -
Oscillator Type - - - -
Number of I/O - - - -
RAM Size - - - -
Series - - - -
Speed - - - -
Operating Temperature - -40°C ~ 85°C 0°C ~ 70°C -40°C ~ 85°C
Connectivity - - - -
Core Size - - - -
Program Memory Type - - - -
Package - Tape & Reel (TR) Tube Tape & Reel (TR)
Package / Case - 196-LFBGA 16-DIP (0.300', 7.62mm) 64-VFQFN Exposed Pad

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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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Common Countries Logistic Time Reference
Region Country Logistic Time(Day)
America United States 5
Brazil 7
Europe Germany 5
United Kingdom 4
Italy 5
Oceania Australia 6
New Zealand 5
Asia India 4
Japan 4
Middle East Israel 6
DHL & FedEx Shipment Charges Reference
Shipment charges(KG) Reference DHL(USD$)
0.00kg-1.00kg USD$30.00 - USD$60.00
1.00kg-2.00kg USD$40.00 - USD$80.00
2.00kg-3.00kg USD$50.00 - USD$100.00
Note:
The above table is for reference only. There may have some data bias for the uncontrollable factors.
Contact us if you have any questions.
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Freescale Semiconductor

MC908MR32VBE

Freescale Semiconductor
32D-MC908MR32VBE

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