S912XET256W1CAL - 16-Bit 50MHz 256KB MCU | NXP
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S912XET256W1CAL Overview
A microcontroller is a programmable semiconductor that integrates a CPU core, Flash program memory, data memory, peripherals, and interface logic into one device. The S12X MCU family is used when a design requires deterministic control, extensive peripheral integration, and a compact single-chip implementation. Its instruction set and bus architecture are intended for embedded control rather than general-purpose computing, making the device suitable for automotive electronics, industrial controllers, and communication modules.
The verified S912XET256W1CAL information identifies a 16-bit CPU operating at 50 MHz, 256 KB Flash organized as 256K x 8, and a 112-LQFP package. The S12X XGATE coprocessor assists virtual-peripheral development and can improve execution throughput for interrupt-driven and signal-processing workloads. The device also includes a memory protection unit, supervisor and user modes, a 12-bit ADC with a stated 3 microsecond conversion time, an enhanced capture timer, periodic interrupt timer, and real-time interrupt timer. Programmable hardware-emulated EEPROM supports designs that require rewriteable nonvolatile data without assigning a separate external EEPROM.
The HCS12X architecture is appropriate for applications needing deterministic interrupt response and broad on-chip integration. Its 256 KB Flash provides room for boot code, application logic, calibration tables, and diagnostics, while the XGATE coprocessor can handle time-critical background tasks. The 12-bit ADC and timer resources reduce the need for separate analog and timing components. The memory protection unit and supervisor/user mode features support controlled software execution and system integrity.
Typical applications include automotive body and chassis control modules, industrial automation controllers, sensor-conditioning equipment, motor-control support circuits, communication gateways, and embedded instrumentation. The verified source data identifies the device as automotive qualified, while the listed -40 °C to +85 °C range covers industrial temperature conditions. Exact peripheral availability, pin multiplexing, memory organization, and electrical limits must be confirmed against the NXP datasheet for the specific design.
When planning a PCB, reserve all 112 LQFP pins and confirm the pin multiplexing requirements before assigning analog, communication, timer, debug, and power functions. Place decoupling and support components close to their associated supply pins, route sensitive analog signals away from fast digital edges, and validate the external clock, reset, programming, and communication interfaces against the manufacturer reference design. The 20 mm by 20 mm LQFP is a relatively large fine-pitch package, so assembly capability and thermal performance should be checked early.
This page combines the verified NXP and distributor product information with an explicit distinction between confirmed specifications and design information that still requires datasheet review. It also records the package, temperature range, qualification claim, Flash capacity, CPU speed, and available alternative information so that engineers can assess fit before beginning schematic capture.
Drop-in alternatives for S912XET256W1CAL — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with S912XET256W1CAL (same form factor and footprint) — differing in Mounting Type, ADC, Operating Temperature, Package, Package Type.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
S912XET256J1CALR
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View Datasheet →S912XDT256F1VAA
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View Datasheet →MC9S12XDQ256VPV
✅ Drop-In✓ In Stock
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View Datasheet →MC9S12HZ256CPV
✅ Drop-In✓ In Stock
Contact for price
View Datasheet →S9S12H256J1VFVE
✅ Drop-In✓ In Stock
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View Datasheet →S912XET256W1CAL Maximum Ratings & Electrical Characteristics
| Manufacturer | NXP Semiconductors |
| Product Type | 16-bit HCS12X microcontroller |
| CPU Core | S12X core |
| Bus Speed | 50 MHz |
| Flash Memory | 256 KB (256K x 8) |
| CPU Word Size | 16-bit |
| Package | 112-LQFP (20 mm x 20 mm) |
| Operating Temperature | -40 °C to +85 °C |
| Qualification | Automotive Qualified |
| ADC | 12-bit resolution |
| ADC Conversion Time | 3 microseconds |
| Coprocessor | XGATE co-processor |
| Programmable EEPROM | Hardware-emulated programmable EEPROM |
| System Integrity | Memory protection unit with supervisor/user modes |
| Timer Resources | Enhanced capture timer, periodic interrupt timer, and real-time interrupt timer |
| Mounting Type | Surface-mount LQFP |
| Terminal Count | 112 terminals |
| RoHS Status | Compliant |
S912XET256W1CAL 112-lqfp (20 mm x 20 mm) Pin Configuration Guide
Pin configuration for S912XET256W1CAL (112-lqfp (20 mm x 20 mm) package). This digital IC includes GPIO, communication interfaces (UART, SPI, I2C), and power pins. Refer to the manufacturer datasheet for alternate pin functions and configuration options. Essential for embedded system design and PCB layout.
No detailed pinout data available for S912XET256W1CAL.
Refer to the datasheet for full pin configuration.
Typical Applications
S912XET256W1CAL is suitable for 6 applications: Automotive Body Control, Industrial Automation Controller, Motor and Actuator Control, Sensor Conditioning and Monitoring, Communication Gateway and Embedded Protocol Node, Programmable Embedded Instrumentation.
Automotive Body Control
The S912XET256W1CAL fits automotive body-control designs that require a 16-bit MCU, 256 KB Flash, and a 50 MHz bus. Its verified automotive-qualified status and -40 °C to +85 °C temperature specification make it a candidate for central body modules, switch-control logic, actuator supervision, and diagnostic gateway functions. The S12X XGATE can separate time-critical virtual-peripheral work from the main control task, while the memory protection unit and supervisor/user modes support controlled execution. Before schematic capture, confirm the exact qualified part number, pin multiplexing, supply requirements, and NXP reference design. Firmware should also include diagnostics and fault handling for automotive environment requirements.
Recommended
Industrial Automation Controller
For industrial automation, the S912XET256W1CAL provides a deterministic 50 MHz S12X processing core and 256 KB Flash for control software, configuration data, and diagnostics. The integrated ADC, capture timer, periodic interrupt timer, and real-time interrupt timer are useful for sensing, timing, and event-driven control loops. The -40 °C to +85 °C operating range supports industrial equipment, subject to the final electrical and qualification requirements. XGATE can offload suitable background processing while the main CPU handles control logic. The 112-LQFP package requires careful routing of fine-pitch signals and adequate thermal design. Confirm pin multiplexing and memory limits in the manufacturer datasheet before committing to the PCB.
Recommended
Motor and Actuator Control
The S912XET256W1CAL is suitable as the supervisory controller in motor and actuator systems where a high-frequency control core, timers, and event interrupts simplify deterministic sequencing. The verified 50 MHz bus supports responsive task scheduling, while the enhanced capture timer and real-time interrupt timer can support input capture, timing measurements, and periodic control events. The 12-bit ADC can be used where analog monitoring is required, subject to pin availability and signal conditioning. XGATE may reduce the load associated with selected peripheral emulation. Power electronics, protection networks, and safety mechanisms must be designed separately. Verify the exact timer channels, ADC mapping, pin multiplexing, and electrical limits in the NXP datasheet before assigning actuator-control functions.
Recommended
Sensor Conditioning and Monitoring
The S912XET256W1CAL can serve as the processing hub in sensor-conditioning and monitoring equipment because it combines a 50 MHz S12X core, a 12-bit ADC, timer resources, and programmable hardware-emulated EEPROM. The ADC's verified 3 microsecond conversion-time claim is useful for selected acquisition workflows, while EEPROM capability can retain calibration or configuration data when the exact supported capacity is confirmed. The memory protection unit and supervisor/user modes can improve software separation in multi-function monitoring products. A production design still needs analog front-end design, sensor excitation, filtering, calibration, and fault detection. Confirm ADC accuracy, sampling behavior, input voltage limits, pin routing, and the exact EEPROM implementation in the manufacturer documentation.
Recommended
Communication Gateway and Embedded Protocol Node
The S912XET256W1CAL is applicable to communication gateway designs that need local protocol handling, timing, and system monitoring in one MCU. Its 16-bit S12X core and 50 MHz bus can execute protocol and supervisory tasks, while the XGATE coprocessor is useful for suitable virtual-peripheral tasks and background processing. The 256 KB Flash capacity provides space for protocol stacks and application code, while supervisor/user modes can support controlled software isolation. Exact serial interfaces, clock requirements, pin multiplexing, and package-level routing must be confirmed because the verified data does not provide a complete peripheral inventory. Use the NXP datasheet and reference designs to validate timing, electrical levels, and software tool compatibility before production release.
Recommended
Programmable Embedded Instrumentation
The S912XET256W1CAL can support programmable instrumentation requiring embedded measurement, timing, and control functions in a -40 °C to +85 °C environment. The 50 MHz bus supports responsive event handling, while the ADC and timer resources can be used for acquisition and measurement workflows. Flash provides application storage, and hardware-emulated EEPROM can support configuration or calibration data once its usable capacity is verified from the exact datasheet. The device is not a complete analog front end, so sensor excitation, amplification, filtering, isolation, and calibration remain external design tasks. Confirm pin assignments, ADC characteristics, memory limits, and development-tool support before finalizing the board. The 112-LQFP package also requires an assembly plan capable of handling its fine-pitch land pattern.
Recommended
Recommended Products Summary
Engineering reference data for S912XET256W1CAL — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | S912XET256J1CALR | S912XDT256F1VAA | MC9S12XDQ256VPV | MC9S12HZ256CPV | S9S12H256J1VFVE |
|---|---|---|---|---|---|---|
| Package | 112-LQFP (20 mm x 20 mm) | LQFP-112 | LQFP-112 | LQFP-112 | LQFP-112 | LQFP-112 |
Key Differentiators
- Verified 16-bit S12X core at 50 MHz (vs S912XDT256F1VAA)
- Confirmed 256 KB Flash organization (vs MC9S12XDQ256VPV)
- Automotive-qualified product listing (vs S912XET256J1CALR)
- Integrated XGATE and system-integrity features (vs MC9S12HZ256CPV)
Design Notes
Confirm the exact 112-LQFP land pattern, pin-1 orientation, exposed thermal requirements, and assembly process before routing. The package is identified as 20 mm by 20 mm with 112 terminals, so the PCB footprint and stencil design should be checked against the NXP package drawing rather than inferred from a generic LQFP library.
Assign every power and ground pin according to the exact NXP datasheet and place the required bypass capacitors close to the device pins. The verified data does not provide supply voltage, current consumption, decoupling values, or power-up limits, so do not select capacitors or regulators from assumptions. Validate startup, reset, brownout behavior, and clock requirements with the manufacturer reference design.
The S912XET256W1CAL includes a 50 MHz S12X bus and an ADC, but the verified data does not specify edge rates, analog accuracy, or peripheral multiplexing. Route clocks and high-speed signals with controlled impedance where required, keep analog inputs away from switching nodes, and confirm alternate-function assignments against the exact pinout before finalizing signal paths.
Do not treat another 112-pin MCU as a substitute based only on package size or Flash capacity. Verify pin names, alternate functions, reset behavior, clock architecture, memory map, timer channels, ADC channels, supply pins, software toolchain, and qualification requirements. The provided alternatives were not independently confirmed as electrically and pin-for-pin equivalent.
Compliance Information
The verified Newark listing states RoHS Compliant: Yes and describes the part as automotive qualified. The supplied data does not separately confirm REACH, lead-free status, halogen-free status, or conflict-minerals compliance. AEC-Q100 is recorded as qualified only as a product-level claim from the distributor listing.
