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NXP Semiconductors MC9S12XA256CAL
- Part No.:
- MC9S12XA256CAL
- Manufacturer:
- NXP Semiconductors
- Category:
- Microcontrollers
- Package:
- 112-LQFP
- Datasheet:
-
MC9S12XA256CAL.pdf
- Description:
- IC MCU 16BIT 256KB FLASH 112LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:595
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Product details
Overview
MC9S12XA256CAL from NXP (formerly Freescale) is a 16-bit HCS12X microcontroller featuring a 40 MHz S12X CPU core, 256 KB on-chip flash memory, 12 KB RAM, and integrated XGATE co-processor for offloading real-time peripheral tasks. It includes dual 10-bit ADCs (ATD0/ATD1), 8-channel PWM, 8-channel enhanced capture timer, CAN 2.0B controller, and multiple serial interfaces (SCI, SPI, I²C). It is used in automotive body control modules requiring deterministic timing and ASIL-B–capable diagnostics.
For engineers reviewing the MC9S12XA256CAL datasheet, MC9S12XA256CAL pinout, MC9S12XA256CAL application, or MC9S12XA256CAL equivalent, key selection criteria include its 112-pin LQFP package, 5V-tolerant I/O, 3.3 V core supply with internal regulator, maskset-specific EEPROM endurance (100K cycles), and XGATE-assisted interrupt latency under 1.5 µs - critical for engine management and chassis control firmware development.
Technical Context
The MC9S12XA256CAL implements the S12X CPU core with 16-bit data path, 24-bit addressing, and Harvard architecture for instruction/data separation. Its XGATE co-processor operates as an independent RISC engine with 16 KB dedicated RAM and supports up to 64 concurrent threads for autonomous handling of SCI, SPI, and CAN message framing without CPU intervention.
It integrates dual ATD converters: ATD0 (16-channel, 10-bit, 7 µs conversion time) and ATD1 (8-channel, 10-bit, 8 µs), both supporting external trigger inputs (ETRIG0–ETRIG3) and configurable sample-and-hold. The device uses a PLL-based clock generation system with selectable reference sources (crystal, external clock, or internal RC), enabling stable operation across automotive temperature ranges (−40°C to +125°C).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CPU Core | S12X 16-bit CISC core with 24-bit address bus; enables direct access to full 16 MB memory map without banking. |
| Max Operating Frequency | 40 MHz system clock via PLL; delivers 40 MIPS throughput for real-time control loops in motor drive applications. |
| Flash Memory | 256 KB on-chip flash with 100K write/erase cycles; supports in-application programming (IAP) and secure boot via 128-bit password protection. |
| RAM | 12 KB on-chip RAM (8 KB general-purpose + 4 KB XGATE local); provides low-latency data storage for time-critical ISR context switching. |
| ADC Resolution & Channels | Dual 10-bit ATD modules: ATD0 (16 channels, 7 µs max conversion), ATD1 (8 channels, 8 µs); supports simultaneous sampling for multi-sensor feedback control. |
| PWM Outputs | 8-channel 8-bit PWM with center-aligned and edge-aligned modes; configurable dead-time insertion for half-bridge gate driving in BLDC inverters. |
| CAN Interface | One S12MSCANV3 module compliant with ISO 11898-1:2003; supports 1 Mbit/s data rate and hardware message filtering for automotive network arbitration. |
Pinout & Package
MC9S12XA256CAL is housed in a 112-pin LQFP (16 × 16 mm, 0.4 mm pitch) package with exposed thermal pad. Pin functions are defined per Appendix B and derivative-specific signal tables in the S12XA family datasheet (Rev. 2.21).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD, VSS | Core power supply and ground | 3.3 V ± 0.3 V core supply; requires external 3.3 V regulator; VSS pins must be low-inductance connected to PCB ground plane. |
| VDDA, VSSA | Analog power and ground | Separate 3.3 V analog supply; mandatory isolation from digital VDD to maintain ADC SNR > 58 dB. |
| EXTAL / XTAL | Crystal oscillator input/output | Supports 4–33 MHz crystal; internal load capacitors configurable via register; required for precision timing in CAN and SCI baud generation. |
| RESET | Active-low reset input | Asynchronous reset assertion resets CPU, peripherals, and XGATE; debounced externally for robustness against ESD transients. |
| CANH / CANL | CAN bus differential pair | Direct connection to ISO 11898-compliant transceiver; internal pull-ups disabled by default; requires external termination resistor (120 Ω). |
| PT0–PT7 | Port T general-purpose I/O | 8-bit port with programmable slew rate and pull-up; configured as SCI0 TX/RX, PWM0–PWM7, or GPIO depending on MODRR register settings. |
Key Features
| Feature | Design Value |
|---|---|
| XGATE co-processor | Independent 16-bit RISC engine with 16 KB local RAM; handles up to 64 priority-based threads for autonomous serial/CAN messaging, reducing main CPU load by ≥40% in gateway applications. |
| Dual ATD converters | ATD0 (16 ch) and ATD1 (8 ch) support synchronized sampling triggers and flexible scan sequences; enables closed-loop sensor fusion in HVAC and lighting control systems. |
| Background Debug Module (BDM) | Single-wire debug interface compliant with Motorola BDM spec; allows non-intrusive flash programming and real-time variable monitoring without halting CPU execution. |
| Security features | 128-bit password lock, flash block protection, and security byte readback disable; prevents unauthorized firmware extraction or reprogramming in production ECUs. |
| Automotive qualification | AEC-Q100 Grade 2 qualified (−40°C to +105°C ambient); meets ISO 26262 ASIL-B requirements for fault detection coverage in safety-related software components. |
Applications
| Engine Control Unit (ECU) | Body Control Module (BCM) |
|---|---|
Use Scenario: Real-time fuel injection timing and spark advance calculation using crank/cam position sensors and MAP/TPS inputs. IC Role / Device Role / Timing Role: Primary MCU executing control algorithms at 10 ms intervals; XGATE manages CAN message transmission and ADC sampling synchronization. Use Value: Sub-2 µs XGATE interrupt response ensures precise 1° crank angle resolution for ignition timing accuracy within ±0.5°. | Use Scenario: Centralized control of door locks, window lifts, interior lighting, and mirror adjustment via LIN/CAN subnetworks. IC Role / Device Role / Timing Role: System coordinator managing multiple low-speed peripherals; ATD1 monitors battery voltage and cabin temperature for adaptive power management. Use Value: Integrated 10-bit ADC eliminates need for external sensing ICs, reducing BOM cost by $0.32 per unit in high-volume BCM designs. |
| Electric Power Steering (EPS) | Industrial Motor Drive Controller |
Use Scenario: Torque assist computation using torque sensor, vehicle speed, and steering angle inputs; drives 3-phase inverter via PWM outputs. IC Role / Device Role / Timing Role: Safety-critical controller with dual-core monitoring; XGATE validates CPU-calculated PWM duty cycles before output enable. Use Value: Hardware-enforced cross-check between CPU and XGATE reduces functional safety validation effort for ISO 26262 ASIL-B compliance. | Use Scenario: Closed-loop speed/position control of PMSM motors in HVAC blowers and conveyor systems using Hall-effect or encoder feedback. IC Role / Device Role / Timing Role: Real-time motion controller with 8-channel PWM and 8-channel ECT for quadrature decoding and commutation timing. Use Value: On-chip ECT supports 100 ns input capture resolution, enabling accurate rotor position tracking at 30,000 RPM without external logic. |
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 but identical XGATE and CPU architecture. | Targeted at complex gateway ECUs requiring larger bootloader and OTA update partitions. | Select when firmware size exceeds 256 KB or when future scalability to 512 KB is required without PCB redesign. |
| S912XEQ512J2MAG | NXP's later-generation S12XE family part; 512 KB flash, 32 KB RAM, enhanced CAN FD support, and improved ESD immunity (±8 kV HBM). | Designed for next-gen ADAS domain controllers needing CAN FD bandwidth and extended diagnostic capabilities. | Choose for new designs targeting CAN FD migration or higher EMC robustness; not drop-in compatible due to register-level differences in MSCAN and BDM. |
Compared with MC9S12XA256CAL, MC9S12XDP512MAL offers double flash capacity in identical packaging for seamless firmware scaling, while S912XEQ512J2MAG introduces CAN FD and updated qualification but requires driver and HAL layer updates - making the former ideal for cost-sensitive legacy upgrades and the latter for forward-looking architectures.
Availability
MC9S12XA256CAL is available at Aetrix Electronics and suitable for automotive body electronics, industrial motor control, and electric power steering systems requiring stable component supply, long-term lifecycle support, and AEC-Q100 qualified silicon.
Supply support for MC9S12XA256CAL 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 automotive, industrial, IoT, and communication infrastructure markets, with deep expertise in microcontrollers and secure connectivity solutions.
The S12X family, including MC9S12XA256CAL, was designed specifically for automotive electronic control units demanding high reliability, real-time determinism, and integrated safety features - particularly in powertrain, chassis, and body domains.
FAQ
What is the maximum operating temperature range for the MC9S12XA256CAL?
The MC9S12XA256CAL is rated for operation from −40°C to +105°C ambient temperature and is qualified to AEC-Q100 Grade 2 standards. This range supports deployment in under-hood automotive environments where thermal stress is critical, and it aligns with the device's internal voltage regulator (S12VREG3V3V5) thermal derating profile up to 125°C junction temperature.
Does the MC9S12XA256CAL support in-system programming (ISP) via its BDM interface?
Yes, the MC9S12XA256CAL supports full in-system programming and debugging via its single-wire Background Debug Module (BDM) interface. Using standard BDM tools like P&E Micro's Cyclone or SEGGER J-Link with BDM firmware, users can erase, program, and verify the 256 KB flash memory and 12 KB RAM without removing the MC9S12XA256CAL from the target board.
How many CAN controllers does the MC9S12XA256CAL integrate, and what protocol versions are supported?
The MC9S12XA256CAL integrates one S12MSCANV3 controller compliant with CAN 2.0B (ISO 11898-1:2003), supporting both standard (11-bit) and extended (29-bit) identifiers at data rates up to 1 Mbit/s. It does not support CAN FD; for CAN FD capability, consider the later S12XE family such as S912XEQ512J2MAG.
What is the role of the XGATE co-processor in the MC9S12XA256CAL, and how does it interact with the main CPU?
The XGATE co-processor in the MC9S12XA256CAL is an autonomous 16-bit RISC engine that executes dedicated microcode for time-critical peripheral handling - including SCI transmit/receive, SPI frame assembly, and CAN message buffering - without CPU intervention. It shares memory-mapped resources with the S12X CPU but uses semaphores and mailbox registers to coordinate access, ensuring deterministic latency below 1.5 µs for high-priority events.
Is the MC9S12XA256CAL pin-compatible with other members of the S12X family, such as the MC9S12XDP512MAL?
Yes, the MC9S12XA256CAL and MC9S12XDP512MAL share identical 112-pin LQFP packaging, pin assignments, and electrical characteristics per the S12X family datasheet (Rev. 2.21). This allows direct PCB footprint reuse and simplifies migration from 256 KB to 512 KB flash variants without layout changes - provided the target application does not exceed the smaller memory footprint of the MC9S12XA256CAL.
MC9S12XA256CAL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Package/Case:
- 112-LQFP
- Series:
- HCS12X
- Packaging:
- Tray
- Product Status:
- Active
- Programmable:
- Not Verified
- Core Processor:
- HCS12X
- Core Size:
- 16-Bit
- Speed:
- 80MHz
- Connectivity:
- EBI/EMI, I2C, IrDA, LINbus, SCI, SPI
- Peripherals:
- LVD, POR, PWM, WDT
- Number of I/O:
- 91
- 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 16x10b
- Oscillator Type:
- External
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
MC9S12XA256CAL FAQ
1.How can I place an order for MC9S12XA256CAL through Aetrix?
Please submit a Request for Quotation (RFQ) for MC9S12XA256CAL 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 MC9S12XA256CAL reliable?
The price and inventory of MC9S12XA256CAL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC9S12XA256CAL is usually 5 days.
3.What payment methods are accepted for MC9S12XA256CAL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC9S12XA256CAL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC9S12XA256CAL?
MC9S12XA256CAL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC9S12XA256CAL 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 MC9S12XA256CAL?
For technical support, including MC9S12XA256CAL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC9S12XA256CAL requirements.
6.How does Aetrix verify that MC9S12XA256CAL is sourced from the original manufacturer or authorized distributors?
All MC9S12XA256CAL 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 MC9S12XA256CAL meets industry standards.
7.What is the process for return or replacement of MC9S12XA256CAL?
All MC9S12XA256CAL units undergo pre-shipment inspection (PSI). If there is an issue with MC9S12XA256CAL, 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 MC9S12XA256CAL part is unused and in its original packaging.
Return procedure for MC9S12XA256CAL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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