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NXP Semiconductors MC9S12B256MFUE
- Part No.:
- MC9S12B256MFUE
- Manufacturer:
- NXP Semiconductors
- Category:
- Microcontrollers
- Package:
- 80-QFP
- Datasheet:
-
MC9S12B256MFUE.pdf
- Description:
- IC MCU 16BIT 256KB FLASH 80QFP
- Quantity:
- Payment:
- Shipping:
Inventory:2,158
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Product details
Overview
MC9S12B256MFUE from Freescale Semiconductor is a 16-bit automotive microcontroller featuring 256 KB Flash EEPROM, 8 KB RAM, 2 KB EEPROM, an 8-channel PWM, 16-channel 10-bit ADC, dual SCI, SPI, I²C, and one CAN 2.0 A/B software-compatible module (MSCAN12), deployed in engine control units and body electronics modules.
For engineers reviewing the MC9S12B256MFUE datasheet, MC9S12B256MFUE pinout, MC9S12B256MFUE application, or MC9S12B256MFUE equivalent, key selection factors include CAN interface compatibility, 112-pin LQFP package I/O count (91 total), wake-up interrupt capability on Ports H/J/P, PLL-based bus speed scaling up to 25 MHz, and BDM debug support for automotive firmware development.
Technical Context
The MC9S12B256MFUE implements the CPU12 core with M68HC11 instruction set compatibility, 20-bit ALU, and instruction queue. Its System Integration Module (SIM) integrates CRG (clock/reset), MEBI (external bus interface), MMC (memory mapping), INT (interrupt control), and BDM (background debug mode).
It supports both single-chip and expanded 8-/16-bit multiplexed bus modes with 1 MB external address space (112-pin only), and includes a PLL enabling adjustable performance/power trade-offs. The MSCAN12 module provides five receive and three transmit buffers, programmable identifier filters (2×32-bit/4×16-bit/8×8-bit), and dedicated Rx/Tx/error/wake-up interrupt channels.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | CPU12 - M68HC11-compatible 16-bit core with 20-bit ALU and instruction queue for deterministic real-time control. |
| Flash Memory | 256 KB Flash EEPROM - Supports in-system programming and protected boot sectors for secure firmware updates. |
| RAM / EEPROM | 8 KB RAM + 2 KB EEPROM - Sufficient for complex automotive control algorithms and non-volatile parameter storage. |
| ADC | 16-channel, 10-bit ADC - Enables high-resolution sensor monitoring (e.g., throttle position, temperature, pressure) with external trigger support. |
| CAN Interface | 1 × MSCAN12 module - Compliant with CAN 2.0 A/B, 1 Mbps data rate, loop-back self-test, and low-pass filter wake-up for network sleep management. |
| PWM Outputs | 8-channel PWM - Configurable as 8×8-bit or 4×16-bit with center/left-aligned outputs and independent duty-cycle control for motor and lamp drivers. |
| Package | 112-pin LQFP - Provides 91 I/O lines including 22 wake-up capable pins (Port H: 8, Port P: 8, Port J: 4, IRQ/XIRQ) for low-power system design. |
Pinout & Package
MC9S12B256MFUE is housed in a 112-pin LQFP (case no. 987), measuring 20.0 × 20.0 mm with 0.65 mm lead pitch. It uses dual supply: 5 V for I/O and analog inputs (VDDA/VDD2/VDDX), 2.5 V internal logic (VDDR), and separate 5 V regulator reference (VREGEN). All I/O pins tolerate 5 V input and drive 5 V levels.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PA0–PA7 | Address/Data Bus (ADDR8–ADDR15/DATA8–DATA15) | Multiplexed 8-bit address/data lines for expanded memory interfacing in narrow bus mode. |
| PP0–PP7 | PWM Output Channels (PWM0–PWM7) | Dedicated 8-channel PWM outputs supporting motor control, LED dimming, and solenoid actuation. |
| PM0 / PM1 | CAN Transceiver Interface (RxCAN0 / TxCAN0) | Direct connection to external CAN transceiver for robust vehicle network communication. |
| PJ6 / PJ7 | I²C Interface (SDA / SCL) | Open-drain bidirectional I²C bus signals compliant with Philips I²C standard for sensor and EEPROM interfacing. |
| PS0–PS3 | SCI0 Serial Interface (RxD0 / TxD0 / RxD1 / TxD1) | Dual asynchronous serial ports supporting diagnostic logging, bootloader communication, and ECU-to-ECU messaging. |
| PE0 / PE1 | Interrupt Inputs (XIRQ / IRQ) | Edge-triggered external interrupt sources enabling fast response to critical events like crash detection or ignition timing. |
| BKGD / MODC | Background Debug Mode (BDM) | Single-wire debug interface for non-intrusive firmware download, breakpoint setting, and real-time register inspection. |
Key Features
| Feature | Design Value |
|---|---|
| PLL Clock Generation | Enables scalable bus speeds up to 25 MHz while maintaining low power in limp-home mode during external clock failure. |
| Wake-Up Interrupt Capability | 22 I/O pins (Port H/J/P + IRQ/XIRQ) support STOP/WAIT mode wake-up, reducing system power consumption in idle states. |
| Memory Mapping Flexibility | User-configurable memory map with 16 KB page window, protected boot sectors, and mappable RAM/EEPROM blocks simplifies firmware partitioning and security implementation. |
| On-Chip Debug Support | Hardware breakpoints and single-wire BDM eliminate need for external emulators, accelerating automotive software validation cycles. |
| Analog Input Protection | 5 V-tolerant analog inputs (VDDA = 5 V, VRH/VRL referenced) allow direct connection to automotive sensors without level-shifting circuitry. |
Applications
| Engine Control Unit (ECU) | Body Control Module (BCM) |
|---|---|
Use Scenario: Real-time management of fuel injection timing, spark advance, and air-fuel ratio using sensor feedback from MAP, O2, and crankshaft position sensors. IC Role / Device Role / Timing Role: Primary 16-bit controller executing closed-loop PID algorithms with deterministic interrupt latency via TIM and ADC synchronization. Use Value: 16-channel 10-bit ADC enables simultaneous sampling of multiple engine sensors; MSCAN12 ensures reliable communication with transmission and ABS ECUs over CAN bus. | Use Scenario: Centralized control of door locks, lighting, wipers, and HVAC functions across distributed vehicle subsystems. IC Role / Device Role / Timing Role: System coordinator interfacing with LIN slaves and CAN nodes, managing power sequencing and fault reporting via I²C and SCI peripherals. Use Value: 91 I/O lines support direct drive of relays and LEDs; wake-up capability on Port H/J/P allows BCM to respond instantly to key fob RF signals while minimizing standby current. |
| Transmission Control Unit (TCU) | Advanced Driver Assistance Systems (ADAS) Sensor Hub |
Use Scenario: Closed-loop control of torque converter clutch, shift solenoids, and gear selection based on vehicle speed, throttle, and engine load. IC Role / Device Role / Timing Role: High-integrity controller executing safety-critical actuator commands with watchdog supervision and memory protection. Use Value: Dual SCI interfaces enable diagnostics and flash reprogramming; 8-channel PWM provides precise solenoid current regulation with configurable dead-time insertion. | Use Scenario: Aggregation and preprocessing of radar, camera, and ultrasonic sensor data before forwarding to central ADAS processor. IC Role / Device Role / Timing Role: Edge-processing node performing time-sensitive signal conditioning, filtering, and CAN message formatting. Use Value: 25 MHz bus speed ensures low-latency ADC sampling and PWM generation for ultrasonic transducer excitation; MSCAN12 supports ISO 11898-1 compliant communication with domain controllers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 16-bit automotive microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MC9S12XEP100MALR | Enhanced XEP family with 100 MHz core equivalent, 1 MB Flash, enhanced CAN FD support, and improved ADC resolution (12-bit). | Targeted at next-generation powertrain systems requiring higher compute throughput and CAN FD bandwidth. | Select when migrating to CAN FD or requiring >25 MHz bus speed and larger code footprint. |
| S912XEQ512J2MAG | Same HCS12X architecture, 512 KB Flash, 32 KB RAM, added XGATE co-processor for offloading communication stacks and signal processing. | Preferred for applications needing concurrent CAN/SCI/I²C handling without CPU overhead, such as gateway modules. | Choose when real-time multitasking or protocol stack acceleration is required beyond MC9S12B256MFUE's single-core capability. |
Compared with MC9S12B256MFUE, MC9S12XEP100MALR delivers higher performance and CAN FD readiness but requires PCB redesign due to different package and pinout; S912XEQ512J2MAG adds XGATE co-processing for parallel peripheral handling but increases BOM cost and toolchain complexity.
Availability
MC9S12B256MFUE is available at Aetrix Electronics and suitable for automotive engine control units, body control modules, and transmission control units requiring stable component supply across extended production lifecycles.
Supply support for MC9S12B256MFUE 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 automotive and industrial microcontrollers, known for robust silicon design and long-term product support.
The MC9S12B-Family was engineered specifically for cost-sensitive automotive multiplexing applications, delivering scalable memory/peripheral configurations while maintaining full pin compatibility across variants.
FAQ
What is the maximum bus speed supported by the MC9S12B256MFUE?
The MC9S12B256MFUE achieves a maximum bus speed of 25 MHz, enabled by its integrated PLL circuit which multiplies the external crystal frequency. This corresponds to a 50 MHz CPU equivalent speed in single-chip mode, sufficient for real-time automotive control tasks including ADC sampling, PWM generation, and CAN message handling without pipeline stalls.
Does the MC9S12B256MFUE support CAN FD?
No, the MC9S12B256MFUE features the MSCAN12 module compliant only with CAN 2.0 A/B protocols at up to 1 Mbps. It does not support CAN FD data rates or extended frame formats. For CAN FD capability, consider newer NXP S32K or legacy HCS12X-family derivatives like MC9S12XEP100, which include enhanced CAN controllers with FD support.
What debug interface does the MC9S12B256MFUE use?
The MC9S12B256MFUE uses Freescale's single-wire Background Debug Mode (BDM) via the BKGD/MODC pin. This interface supports non-intrusive firmware download, hardware breakpoint setting, register inspection, and real-time memory access without requiring dedicated JTAG pins or external emulators-critical for space-constrained automotive PCB layouts.
How many wake-up capable I/O pins does the MC9S12B256MFUE have in the 112-pin LQFP package?
The MC9S12B256MFUE in the 112-pin LQFP package has 22 wake-up capable I/O pins: Port H (8 pins), Port P (8 pins), Port J (4 pins), plus IRQ and XIRQ external interrupt inputs. These pins can generate interrupts from STOP or WAIT low-power modes, enabling rapid system response to events like keyless entry signals or collision detection triggers.
Is the MC9S12B256MFUE RoHS-compliant and lead-free?
Yes, the MC9S12B256MFUE is RoHS-compliant and lead-free, meeting EU Directive 2011/65/EU requirements. Freescale confirmed Pb-free versions retain identical functionality and electrical characteristics versus non-RoHS counterparts, with no derating or performance impact-verified per Freescale document HCS12BFAMILYPP Rev. 2.8 and product change notices.
MC9S12B256MFUE Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Package/Case:
- 80-QFP
- Series:
- HCS12
- Packaging:
- Tray
- Product Status:
- Active
- Programmable:
- Not Verified
- Core Processor:
- HCS12
- Core Size:
- 16-Bit
- Speed:
- 25MHz
- Connectivity:
- CANbus, I2C, SCI, SPI
- Peripherals:
- POR, PWM, WDT
- Number of I/O:
- 59
- Program Memory Size:
- 256KB (256K x 8)
- Program Memory Type:
- FLASH
- EEPROM Size:
- 2K x 8
- RAM Size:
- 4K x 8
- Voltage - Supply (Vcc/Vdd):
- 2.35V ~ 5.5V
- Data Converters:
- A/D 8x10b
- Oscillator Type:
- Internal
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
MC9S12B256MFUE FAQ
1.How can I place an order for MC9S12B256MFUE through Aetrix?
Please submit a Request for Quotation (RFQ) for MC9S12B256MFUE on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for MC9S12B256MFUE reliable?
The price and inventory of MC9S12B256MFUE are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC9S12B256MFUE is usually 5 days.
3.What payment methods are accepted for MC9S12B256MFUE?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC9S12B256MFUE transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC9S12B256MFUE?
MC9S12B256MFUE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC9S12B256MFUE order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for MC9S12B256MFUE?
For technical support, including MC9S12B256MFUE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC9S12B256MFUE requirements.
6.How does Aetrix verify that MC9S12B256MFUE is sourced from the original manufacturer or authorized distributors?
All MC9S12B256MFUE products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that MC9S12B256MFUE meets industry standards.
7.What is the process for return or replacement of MC9S12B256MFUE?
All MC9S12B256MFUE units undergo pre-shipment inspection (PSI). If there is an issue with MC9S12B256MFUE, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The MC9S12B256MFUE part is unused and in its original packaging.
Return procedure for MC9S12B256MFUE:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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