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NXP Semiconductors MC9S12XD256MAA
- Part No.:
- MC9S12XD256MAA
- Manufacturer:
- NXP Semiconductors
- Category:
- Microcontrollers
- Package:
- 80-QFP
- Datasheet:
-
MC9S12XD256MAA.pdf
- Description:
- IC MCU 16BIT 256KB FLASH 80QFP
- Quantity:
- Payment:
- Shipping:
Inventory:1,051
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Product details
Overview
MC9S12XD256MAA from NXP (formerly Freescale) is a 16-bit HCS12X microcontroller featuring a dual-core architecture with S12X CPU and XGATE coprocessor, 256 KB on-chip Flash, 14 KB RAM, and integrated peripherals including dual ATD converters (10-bit, 16-channel + 8-channel), 8-channel PWM, 6 SCI, 3 SPI, I²C, CAN 2.0B, and ECT timer. It targets automotive body control modules requiring deterministic real-time response.
For engineers reviewing the MC9S12XD256MAA datasheet, MC9S12XD256MAA pinout, MC9S12XD25256MAA application, or MC9S12XD256MAA equivalent, key selection criteria include XGATE offloading capability for interrupt-intensive tasks, 5V-tolerant I/O for legacy automotive harness compatibility, maskset-specific EEPROM endurance (100k cycles), and qualification per AEC-Q100 Grade 2 (−40°C to +105°C).
Technical Context
The MC9S12XD256MAA implements a time-triggered dual-core architecture: the S12X CPU executes main application code at up to 50 MHz bus speed, while the XGATE RISC coprocessor handles high-priority peripheral interrupts-including ATD conversions, PWM updates, and CAN message handling-without CPU intervention. Its memory map includes 256 KB Flash (organized in 2 KB sectors), 14 KB RAM (8 KB general-purpose + 6 KB XGATE-only), and 4 KB EEPROM.
Peripherals are tightly coupled via the XBAR crossbar switch, enabling concurrent access to Flash, RAM, and peripheral registers. The device supports multiple clock sources (crystal, external clock, PLL-synthesized), low-power stop/wait modes with wake-on-IRQ, and hardware security features including flash protection and COP watchdog with windowed timing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CPU Core | S12X 16-bit CISC core with 50 MHz max bus frequency; enables deterministic real-time control loops in automotive ECUs. |
| Memory | 256 KB on-chip Flash (2 KB sectors), 14 KB RAM (8 KB CPU-accessible + 6 KB XGATE-exclusive), 4 KB EEPROM (100k write cycles). |
| Analog Peripherals | Dual ATD: ATD0 (10-bit, 16-channel), ATD1 (10-bit, 8-channel); supports simultaneous sampling and hardware-triggered conversion sequences. |
| Communication | 6 × SCI, 3 × SPI, 1 × I²C, 1 × MSCAN (CAN 2.0B compliant); enables full vehicle network integration with LIN gateway support via SCI. |
| Timers & PWM | Enhanced Capture Timer (ECT) with 8 input-capture/output-compare channels; 8-channel PWM module with center-aligned and edge-aligned modes. |
| Operating Range | AEC-Q100 Grade 2 qualified: −40°C to +105°C ambient; 4.5 V to 5.5 V supply voltage; 5V-tolerant digital I/O pins simplify interface with legacy sensors/actuators. |
| Package | 112-pin LQFP (16 × 16 mm, 0.4 mm pitch); RoHS-compliant; thermal pad for enhanced heat dissipation in sealed automotive enclosures. |
Pinout & Package
MC9S12XD256MAA is housed in a 112-pin LQFP package (16 mm × 16 mm, 0.4 mm pitch) with exposed thermal pad. Pin assignments follow the S12XD family standard layout defined in Appendix B of the MC9S12XDP512 datasheet Rev. 2.21, with dedicated power/ground pairs, differential CAN transceiver pins (CANL/CANH), and multiplexed I/O supporting peripheral function remapping via PORT registers.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD, VSS | Core power supply and ground | Multiple dedicated pairs reduce noise coupling; requires local 100 nF ceramic decoupling per pair near package corner. |
| VDDA, VSSA | Analog power and ground | Isolated analog domain for ATD reference stability; must be routed separately from digital planes. |
| EXTAL, XTAL | Pierce oscillator crystal connections | Supports 4–33 MHz crystals; internal load capacitors configurable via register; essential for CAN bit timing accuracy. |
| CANH, CANL | Differential CAN bus interface | Integrated CAN physical layer driver; meets ISO 11898-2 electrical specs; requires external termination resistor (120 Ω). |
| SCI0TX, SCI0RX | UART transmit/receive | Asynchronous serial interface for diagnostics and bootloader communication; supports LIN physical layer via software bit-banging. |
| RESET | Active-low reset input | Asynchronous reset assertion clears CPU registers and initializes peripheral state; debounced externally for robustness against EMI. |
Key Features
| Feature | Design Value |
|---|---|
| XGATE coprocessor | Independent 16-bit RISC engine with 6 KB dedicated RAM; offloads time-critical ISR handling (e.g., ATD scan completion, CAN RX FIFO management) from main CPU. |
| Dual ATD subsystems | ATD0 (16-channel) and ATD1 (8-channel) operate concurrently with shared trigger logic; enables synchronized multi-sensor acquisition for motor position/speed estimation. |
| Hardware security | Flash protection via security byte; COP watchdog with programmable timeout and windowed enable/disable; prevents unauthorized firmware access or runaway code execution. |
| Flexible clock system | Configurable PLL with selectable dividers; supports crystal, external clock, or self-clock mode; enables dynamic bus speed scaling for power optimization. |
| Automotive qualification | AEC-Q100 Grade 2 certified; validated for operation at 105°C junction temperature; meets EMC immunity requirements per ISO 11452-4 (BCI) and ISO 10605 (ESD). |
Applications
| Body Control Module (BCM) | Engine Control Unit (ECU) Subsystem |
|---|---|
Use Scenario: Centralized control of door locks, lighting, wipers, and HVAC actuators in modern passenger vehicles. IC Role / Device Role / Timing Role: Main controller executing state machines and sensor fusion algorithms; XGATE manages PWM dimming for LED lighting and CAN message scheduling. Use Value: 256 KB Flash accommodates complex feature sets (e.g., adaptive lighting profiles); 5V-tolerant I/O eliminates level-shifter components for legacy switch inputs. | Use Scenario: Auxiliary control node managing throttle actuator, idle air control valve, and exhaust gas recirculation (EGR) solenoid in Tier-2 emission systems. IC Role / Device Role / Timing Role: Real-time actuator driver interfacing with main ECU via CAN; ATD0 samples throttle position and EGR temperature sensors synchronously. Use Value: Dual ATD converters enable simultaneous sampling of critical engine parameters; AEC-Q100 Grade 2 ensures reliability under under-hood thermal stress. |
| Electric Power Steering (EPS) Sensor Interface | Commercial Vehicle Telematics Gateway |
Use Scenario: Signal conditioning and preprocessing of torque sensor, motor current, and steering angle feedback in EPS systems. IC Role / Device Role / Timing Role: Dedicated sensor interface MCU; XGATE processes ATD conversion results and generates SPI commands to motor driver ICs. Use Value: XGATE's deterministic latency (<500 ns IRQ response) guarantees sub-millisecond torque loop closure; 4 KB EEPROM stores calibration coefficients with 100k-cycle endurance. | Use Scenario: Aggregation and protocol translation between J1939 (CAN), LIN, and cellular modem interfaces in fleet management telematics units. IC Role / Device Role / Timing Role: Protocol gateway processor; MSCAN handles J1939 messaging while SCI0/SCI1 manage LIN master/slave communication. Use Value: Six SCI modules allow concurrent diagnostic port, LIN cluster, and modem UART links; 112-pin LQFP provides sufficient I/O for discrete GPIO-based ignition detection and GNSS PPS input. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MC9S12XDP512MAL | 512 KB Flash, 32 KB RAM, same pinout and peripheral set; higher memory density for larger firmware images or data logging buffers. | Targeted at premium BCMs requiring over-the-air update capability or extended diagnostic trace storage. | Select when firmware size exceeds 256 KB or when future-proofing for feature expansion is required. |
| S912XEQ512J2MAG | NXP S12XE derivative with enhanced CAN FD support, 512 KB Flash, and updated maskset (MAG); not pin-compatible due to different pin assignment for XGATE debug signals. | Required for next-gen vehicle platforms mandating CAN FD data rate (>5 Mbps) or ISO 26262 ASIL-B compliance. | Choose only if CAN FD or functional safety certification is mandatory; requires PCB redesign. |
Compared with MC9S12XD256MAA, MC9S12XDP512MAL offers double the Flash/RAM without layout changes, making it ideal for scalable designs; S912XEQ512J2MAG delivers CAN FD and safety features but demands new hardware due to non-interchangeable pinout and debug interface.
Availability
MC9S12XD256MAA is available at Aetrix Electronics and suitable for automotive body control modules, engine subsystem controllers, electric power steering interfaces, and commercial vehicle telematics gateways requiring stable component supply across extended production lifecycles.
Supply support for MC9S12XD256MAA 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
NXP Semiconductors is a global semiconductor leader focused on secure connectivity solutions for automotive, industrial, and IoT applications.
The S12XD microcontroller family was designed specifically for cost-sensitive, high-reliability automotive body electronics, emphasizing real-time determinism, AEC-Q100 compliance, and peripheral integration to reduce system-level BOM count.
FAQ
What is the maximum operating frequency of the MC9S12XD256MAA CPU core?
The MC9S12XD256MAA features an S12X CPU core with a maximum bus frequency of 50 MHz. This is achieved using the on-chip PLL configured with external crystal input (e.g., 8 MHz) and internal multiplication/division settings. The actual instruction execution speed depends on bus cycle timing and wait-state configuration for Flash access; MC9S12XD256MAA achieves typical throughput of ~25 MIPS at 50 MHz bus speed.
Does the MC9S12XD256MAA support CAN FD communication?
No, the MC9S12XD256MAA integrates the S12MSCANV3 module, which implements Classical CAN 2.0B only (up to 1 Mbps). It does not support CAN FD features such as flexible data-rate, extended data length (up to 64 bytes), or CRC enhancements. For CAN FD, designers must select newer NXP derivatives like the S912XEQ512J2MAG or S32K series microcontrollers.
How much dedicated RAM is allocated to the XGATE coprocessor in the MC9S12XD256MAA?
The MC9S12XD256MAA allocates 6 KB of RAM exclusively for XGATE use, mapped into the XGATE memory space (0x2000–0x37FF). This memory is inaccessible to the main S12X CPU and is used for XGATE program code, data stacks, and peripheral buffer management. Combined with the 8 KB general-purpose RAM, total on-chip RAM is 14 KB.
What is the endurance rating of the on-chip EEPROM in the MC9S12XD256MAA?
The MC9S12XD256MAA includes 4 KB of on-chip EEPROM rated for 100,000 write/erase cycles per sector under specified operating conditions (−40°C to +105°C, VDD = 4.5–5.5 V). Endurance is verified per AEC-Q100 stress test requirements and applies to all 64-byte EEPROM sectors. Wear leveling must be implemented in firmware for applications requiring frequent updates.
Is the MC9S12XD256MAA pin-compatible with the MC9S12XDP512MAL?
Yes, the MC9S12XD256MAA and MC9S12XDP512MAL share identical 112-pin LQFP packaging, pin assignments, and peripheral signal mapping per the S12XD family specification. They differ only in Flash (256 KB vs. 512 KB) and RAM (14 KB vs. 32 KB) capacity, making MC9S12XDP512MAL a direct drop-in upgrade for designs needing additional memory headroom.
MC9S12XD256MAA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Package/Case:
- 80-QFP
- Series:
- HCS12X
- Packaging:
- Tray
- Product Status:
- Active
- Programmable:
- Not Verified
- Core Processor:
- HCS12X
- Core Size:
- 16-Bit
- Speed:
- 80MHz
- Connectivity:
- CANbus, EBI/EMI, I2C, IrDA, LINbus, SCI, SPI
- Peripherals:
- LVD, POR, PWM, WDT
- Number of I/O:
- 59
- Program Memory Size:
- 256KB (256K x 8)
- Program Memory Type:
- FLASH
- EEPROM Size:
- 4K x 8
- RAM Size:
- 14K x 8
- Voltage - Supply (Vcc/Vdd):
- 2.35V ~ 5.5V
- Data Converters:
- A/D 8x10b
- Oscillator Type:
- External
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
MC9S12XD256MAA FAQ
1.How can I place an order for MC9S12XD256MAA through Aetrix?
Please submit a Request for Quotation (RFQ) for MC9S12XD256MAA 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 MC9S12XD256MAA reliable?
The price and inventory of MC9S12XD256MAA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC9S12XD256MAA is usually 5 days.
3.What payment methods are accepted for MC9S12XD256MAA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC9S12XD256MAA transactions.
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4.How is shipping managed for MC9S12XD256MAA?
MC9S12XD256MAA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC9S12XD256MAA 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 MC9S12XD256MAA?
For technical support, including MC9S12XD256MAA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC9S12XD256MAA requirements.
6.How does Aetrix verify that MC9S12XD256MAA is sourced from the original manufacturer or authorized distributors?
All MC9S12XD256MAA 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 MC9S12XD256MAA meets industry standards.
7.What is the process for return or replacement of MC9S12XD256MAA?
All MC9S12XD256MAA units undergo pre-shipment inspection (PSI). If there is an issue with MC9S12XD256MAA, 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 MC9S12XD256MAA part is unused and in its original packaging.
Return procedure for MC9S12XD256MAA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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