MC9S12DJ256MFUE
MC9S12DJ256MFUE - 16-Bit 25MHz 256KB MCU | NXP
The NXP Semiconductors MC9S12DJ256MFUE is a 16-bit HCS12 CISC microcontroller with a 25 MHz maximum clock, 256 KB of Flash memory, and an 80-pin PQFP package. It is designed for automotive multiplexing applications and integrates two asynchronous serial communication interfaces, two 8-channel 10-bit ADCs, an 8-channel PWM module, an enhanced capture timer, and 59 I/O lines. The device is identified as NRND by the NXP product page.
A microcontroller is a programmable control component that executes firmware, reads inputs, manages interfaces, and controls external hardware. The HCS12 family combines a 16-bit CISC core with automotive-oriented peripherals and system integration functions. In the broader hierarchy, this device is a microcontroller, embedded processor, semiconductor, and automotive electronic component.
The verified information identifies two asynchronous serial communications interfaces, two 8-channel 10-bit ADCs, an 8-channel PWM, a 20-channel enhanced capture timer, 20 discrete digital I/O lines, and 59 total I/O ports. Its 256 KB Flash memory provides on-chip program storage, while the HCS12 platform supports system resource mapping, clock generation, interrupt control, and bus interfacing. The NXP overview specifically places the MC9S12D family in automotive multiplexing applications.
The MC9S12D architecture uses full 16-bit internal data paths while allowing the external bus to operate in an 8-bit narrow mode for lower-cost memory interfacing. The SIM manages system resource mapping, clock generation, interrupts, and bus interfaces. The supplied distributor records identify the device as a 16-bit HCS12 microcontroller with Flash memory and an 80-pin package; one verified record states 25 MHz maximum frequency, while another third-party summary states 50 MHz, so the manufacturer record is used for the canonical specification and the discrepancy is flagged for validation.
Typical applications include automotive body or multiplexing controllers, distributed control modules, actuator interfaces, sensor acquisition systems, and other embedded control platforms requiring multiple analog channels, serial communication, PWM outputs, and deterministic bus interfacing. The automotive orientation makes the device suitable for designs where peripheral integration and 16-bit control throughput are important.
When designing around this MCU, verify the exact power, temperature, memory-map, oscillator, and peripheral limits in the NXP datasheet before release. Use the package pinout and manufacturer reference documentation for decoupling, clock, reset, analog-input, and external-bus layout. Because the part is NRND, new production designs should confirm lifecycle availability and migration requirements with NXP.
This page consolidates verified manufacturer, distributor, and technical-source information, highlights the device's verified peripheral set and package, and identifies where additional datasheet data or lifecycle confirmation is required. It is intended to support engineering comparison, sourcing, and design review rather than replace the manufacturer documentation.
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