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NXP Semiconductors MC9S12XDT256CAA
- Part No.:
- MC9S12XDT256CAA
- Manufacturer:
- NXP Semiconductors
- Category:
- Microcontrollers
- Package:
- 80-QFP
- Datasheet:
-
MC9S12XDT256CAA.pdf
- Description:
- IC MCU 16BIT 256KB FLASH 80QFP
- Quantity:
- Payment:
- Shipping:
Inventory:314
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Product details
Overview
MC9S12XDT256CAA from NXP (formerly Freescale) is a 16-bit HCS12X microcontroller featuring an S12X CPU core, 256 KB on-chip flash memory, 16 KB RAM, and integrated XGATE co-processor for offloading real-time tasks. It supports dual CAN 2.0B controllers, 16-channel 10-bit ADC, 8-channel PWM, and operates at up to 50 MHz bus speed in automotive-grade temperature range (–40°C to +125°C).
For engineers reviewing the MC9S12XDT256CAA datasheet, MC9S12XDT256CAA pinout, MC9S12XDT256CAA application, or MC9S12XDT256CAA equivalent, key selection criteria include CAN interface count, XGATE acceleration capability, flash endurance (100K erase/write cycles), EMI-hardened packaging, and qualification per AEC-Q100 Grade 1.
Technical Context
The MC9S12XDT256CAA implements the S12X CPU core with enhanced instruction set and 24-bit addressing, paired with the XGATE RISC co-processor - a separate 16-bit engine capable of autonomous peripheral handling without CPU intervention. Its memory subsystem includes 256 KB flash (organized as two 128 KB banks), 16 KB RAM, and 2 KB EEPROM with hardware ECC.
Peripheral integration targets automotive body control and powertrain sub-systems: dual MSCAN modules with independent message buffers, 16-channel ATD10B16CV4 ADC with configurable sample-and-hold, 8-channel PWM with center-aligned and edge-aligned modes, and full-featured SCI/SPI/IIC interfaces - all clocked via a flexible PLL-based system clock generator supporting multiple low-power modes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CPU Core | S12X 16-bit CISC core with 24-bit addressing and 50 MHz max bus frequency |
| Flash Memory | 256 KB on-chip flash with 100K erase/write cycles and hardware ECC |
| XGATE Co-processor | Dedicated 16-bit RISC engine with 4 KB local RAM and autonomous interrupt-driven execution |
| CAN Interfaces | Two independent S12MSCANV3 modules, each supporting CAN 2.0B protocol and 64-message FIFO |
| ADC | 16-channel 10-bit ATD10B16CV4 with 8 µs conversion time and external trigger support |
| PWM Channels | 8-channel S12PWM8B8CV1 with programmable resolution (8/9/10-bit), dead-time insertion, and fault protection |
| Operating Temp | –40°C to +125°C, qualified to AEC-Q100 Grade 1 for automotive under-hood use |
Pinout & Package
MC9S12XDT256CAA is housed in a 112-pin LQFP (16 × 16 mm, 0.4 mm pitch) package with exposed thermal pad, optimized for EMI suppression and thermal dissipation in automotive ECUs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD, VSS | Core power supply and ground | Separate analog/digital domains: VDDA/VSSA for ADC reference stability; VDD/VSS for logic |
| EXTAL / XTAL | Clock crystal input/output | Supports 4–32 MHz fundamental-mode crystals; enables precise timing for CAN bit rate accuracy |
| CAN0TX / CAN0RX | Primary CAN transceiver interface | Differential signaling pair for CAN 2.0B high-speed (up to 1 Mbps) communication |
| CAN1TX / CAN1RX | Secondary CAN transceiver interface | Independent physical layer interface enabling dual-bus architectures (e.g., powertrain + body networks) |
| AN0–AN15 | Analog input channels | 16 dedicated pins with programmable gain and sample-and-hold; shared with GPIO when unused |
| SCI0TX / SCI0RX | Asynchronous serial interface | Full-duplex UART supporting bootloader programming and diagnostic communication |
Key Features
| Feature | Design Value |
|---|---|
| XGATE co-processor | Offloads time-critical ISR handling (e.g., CAN message filtering, PWM synchronization), freeing main CPU for application logic |
| Dual CAN 2.0B controllers | Enables concurrent communication on two isolated CAN buses - essential for domain-separated automotive architectures |
| Hardware ECC for flash & EEPROM | Ensures data integrity over lifetime; eliminates need for software checksum overhead in safety-critical storage |
| AEC-Q100 Grade 1 qualification | Validated for continuous operation at 125°C ambient - suitable for engine control, transmission, and ABS modules |
| Background Debug Module (BDM) | Single-wire debug interface supporting non-intrusive real-time trace, flash programming, and breakpoint debugging |
Applications
| Engine Control Unit (ECU) | Transmission Control Module (TCM) |
|---|---|
Use Scenario: Real-time fuel injection timing, spark advance calculation, and knock detection using analog sensor inputs and closed-loop feedback. IC Role / Device Role / Timing Role: Primary controller executing deterministic control loops at ≤1 ms intervals with XGATE-assisted ADC sampling and CAN message dispatch. Use Value: 50 MHz bus speed and hardware PWM with dead-time control enable precise actuator drive; dual CAN supports OBD-II diagnostics and powertrain coordination. | Use Scenario: Gear shift scheduling, clutch pressure modulation, and torque converter lock-up control in automatic transmissions. IC Role / Device Role / Timing Role: Safety-critical real-time controller interfacing with hydraulic solenoids, position sensors, and vehicle network via CAN. Use Value: AEC-Q100 Grade 1 rating ensures reliability at under-hood temperatures; 256 KB flash accommodates complex shift logic and calibration tables. |
| Body Control Module (BCM) | Electric Power Steering (EPS) |
Use Scenario: Centralized management of lighting, door locks, window lifts, and HVAC actuators across distributed LIN/CAN nodes. IC Role / Device Role / Timing Role: Network gateway and local decision engine coordinating multi-sensor inputs and PWM-driven motor drivers. Use Value: Integrated 8-channel PWM drives multiple DC motors directly; dual CAN allows separation of comfort and chassis networks. | Use Scenario: Torque assist computation, motor phase current sensing, and fault-safe shutdown in brushless EPS systems. IC Role / Device Role / Timing Role: High-integrity motor controller performing FOC (Field-Oriented Control) with synchronized ADC sampling and PWM update. Use Value: 16-channel ADC with external trigger enables precise current sampling at commutation points; XGATE handles encoder interpolation autonomously. |
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, same pinout and peripheral set; higher memory density for complex firmware or OTA update partitions | Preferred where larger code footprint, dual-bank flash for safe firmware updates, or extended calibration data storage is required | Select MC9S12XDP512MAL if future scalability or ASAM-compliant calibration support is needed; otherwise MC9S12XDT256CAA offers optimal cost/performance balance. |
| S912XEQ512J2MAG | NXP's later-generation S12XE family part; identical 512 KB flash but enhanced CAN FD readiness and improved ESD immunity (±8 kV HBM) | Better suited for next-gen vehicles requiring CAN FD migration path or stricter EMC requirements | Choose S912XEQ512J2MAG only when CAN FD capability or upgraded ESD robustness is mandated; MC9S12XDT256CAA remains fully validated for legacy CAN-only designs. |
Compared with MC9S12XDP512MAL and S912XEQ512J2MAG, the MC9S12XDT256CAA delivers optimal cost-efficiency for mature CAN-based automotive modules where 256 KB flash suffices and AEC-Q100 Grade 1 compliance meets functional safety requirements without needing CAN FD or extended memory.
Availability
MC9S12XDT256CAA is available at Aetrix Electronics and suitable for engine control units, transmission control modules, and body control modules requiring stable component supply across long-life automotive production programs.
Supply support for MC9S12XDT256CAA 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 MC9S12XDT256CAA belongs to the HCS12X automotive microcontroller family, designed specifically for real-time, safety-conscious vehicle subsystems requiring deterministic performance, dual CAN networking, and AEC-Q100 qualification.
FAQ
What is the maximum operating frequency of the MC9S12XDT256CAA?
The MC9S12XDT256CAA supports a maximum bus frequency of 50 MHz, achieved via its internal PLL with programmable multiplication factor. This frequency governs peripheral timing, including CAN bit rates, ADC sampling, and PWM resolution. The S12X CPU core executes instructions at this bus speed, enabling deterministic real-time response in automotive control loops. System clock configuration is managed through the Clocks and Reset Generator (CRG) module.
Does the MC9S12XDT256CAA support CAN FD?
No, the MC9S12XDT256CAA does not support CAN FD. It integrates two S12MSCANV3 modules compliant exclusively with ISO 11898-1:2003 CAN 2.0B specification, supporting data rates up to 1 Mbps with standard 11-bit or extended 29-bit identifiers. CAN FD capability requires newer families such as S12XE or S32K. For CAN FD migration, NXP recommends evaluating the S912XEQ512J2MAG as a forward-compatible alternative while retaining pin compatibility in certain packages.
How much user-accessible RAM does the MC9S12XDT256CAA provide?
The MC9S12XDT256CAA provides 16 KB of on-chip RAM, fully accessible to the application for variables, stack, heap, and buffer storage. This RAM is organized as a contiguous block mapped into the S12X memory space and supports byte, word, and long-word access. It is distinct from the 4 KB XGATE local RAM and does not include register file or cache - all 16 KB is available for firmware use under standard linker configurations.
Is the MC9S12XDT256CAA qualified for automotive applications?
Yes, the MC9S12XDT256CAA is fully qualified to AEC-Q100 Grade 1 standards, certifying reliable operation from –40°C to +125°C ambient temperature. It undergoes stress testing for HTOL, TC, UHST, and ESD (±2 kV HBM), and is manufactured in IATF 16949-certified facilities. This qualification makes it suitable for under-hood applications including engine control, transmission control, and ABS modules where thermal and electrical robustness are mandatory.
What debug interface does the MC9S12XDT256CAA use?
The MC9S12XDT256CAA uses the Background Debug Mode (BDM) interface, a single-wire proprietary debug protocol supported by NXP's CodeWarrior IDE and third-party emulators. BDM enables non-intrusive flash programming, real-time variable monitoring, hardware breakpoints, and exception tracing without requiring dedicated JTAG pins. It operates at standard asynchronous serial speeds and is electrically compatible with standard 5 V tolerant debug probes used across the HCS12X family.
MC9S12XDT256CAA 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:
- 16K x 8
- Voltage - Supply (Vcc/Vdd):
- 2.35V ~ 5.5V
- Data Converters:
- A/D 8x10b
- Oscillator Type:
- External
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
MC9S12XDT256CAA FAQ
1.How can I place an order for MC9S12XDT256CAA through Aetrix?
Please submit a Request for Quotation (RFQ) for MC9S12XDT256CAA 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 MC9S12XDT256CAA reliable?
The price and inventory of MC9S12XDT256CAA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC9S12XDT256CAA is usually 5 days.
3.What payment methods are accepted for MC9S12XDT256CAA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC9S12XDT256CAA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC9S12XDT256CAA?
MC9S12XDT256CAA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC9S12XDT256CAA 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 MC9S12XDT256CAA?
For technical support, including MC9S12XDT256CAA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC9S12XDT256CAA requirements.
6.How does Aetrix verify that MC9S12XDT256CAA is sourced from the original manufacturer or authorized distributors?
All MC9S12XDT256CAA 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 MC9S12XDT256CAA meets industry standards.
7.What is the process for return or replacement of MC9S12XDT256CAA?
All MC9S12XDT256CAA units undergo pre-shipment inspection (PSI). If there is an issue with MC9S12XDT256CAA, 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 MC9S12XDT256CAA part is unused and in its original packaging.
Return procedure for MC9S12XDT256CAA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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