NXP Semiconductors S912XET256J2MAG

Overview

S912XET256J2MAG from NXP Semiconductors (formerly Freescale) is a 16-bit HCS12X microcontroller featuring a 256 KB on-chip flash memory, 14 KB RAM, and an enhanced XGATE co-processor for offloading time-critical tasks. It operates at up to 50 MHz, supports CAN 2.0B and LIN 2.1 protocols, and integrates dual 12-bit ADCs with 16 channels - used in automotive body control modules requiring deterministic real-time response.

For engineers reviewing the S912XET256J2MAG datasheet, S912XET256J2MAG pinout, S912XET256J2MAG application, or S912XET256J2MAG equivalent, key selection criteria include its 112-pin LQFP package, 5V-tolerant I/O, hardware CRC module, background debug mode (BDM) support, and qualification per AEC-Q100 Grade 2 for under-hood automotive use.

Technical Context

The S912XET256J2MAG implements the S12X CPU core with 16-bit data/24-bit address bus, augmented by the XGATE RISC co-processor that executes interrupt service routines independently of the main CPU. Its memory subsystem includes 256 KB flash with EEPROM emulation, 14 KB RAM, and configurable memory protection unit (MPU) with eight regions.

Peripheral integration includes dual MSCAN controllers, two SPI interfaces, three SCI modules, two IIC buses, 8-channel PWM, 16-bit ECT timer with input capture/output compare, and a 12-bit ADC0 (16-channel, 8 µs conversion) plus ADC1 (8-channel). Clock generation supports crystal, ceramic resonator, or external clock inputs with PLL multiplication up to 50 MHz.

Key Specifications

Pinout & Package

Package: 112-pin LQFP (16 × 16 mm, 0.4 mm pitch), RoHS-compliant, moisture sensitivity level 3.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar microcontroller applications.

Compared with MC9S12XEP100MAL, the S912XET256J2MAG delivers 2.5× more flash and XGATE acceleration for deterministic real-time processing; versus S912XEQ512J2MAG, it offers optimal cost/performance balance for mid-tier automotive modules without over-provisioning memory.

Availability

S912XET256J2MAG is available at Aetrix Electronics and suitable for automotive body control modules, engine subsystem controllers, ADAS sensor hubs, and LIN master nodes requiring stable component supply, long lifecycle assurance, and AEC-Q100-compliant sourcing.

Supply support for S912XET256J2MAG 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 solutions, with deep expertise in microcontrollers and secure edge processing.

The S912XET256J2MAG belongs to the legacy HCS12X family designed specifically for cost-optimized, high-reliability automotive applications demanding real-time determinism, functional safety support, and long-term supply stability.

FAQ

What is the maximum operating frequency of the S912XET256J2MAG?

The S912XET256J2MAG achieves a maximum system clock frequency of 50 MHz using its integrated PLL. This allows a 20 ns instruction cycle time for the S12X CPU core, enabling hard real-time control loops in automotive applications such as PWM-driven actuator control and CAN message scheduling. The S912XET256J2MAG maintains this performance across its full AEC-Q100 Grade 2 temperature range (−40°C to +105°C).

Does the S912XET256J2MAG support CAN FD?

The S912XET256J2MAG features two MSCAN 2.0B controllers compliant with ISO 11898-1:2003, supporting classic CAN up to 1 Mbps but not CAN FD (ISO 11898-1:2015). Its CAN modules lack the bit-rate switching and extended data length capabilities required for CAN FD. For CAN FD applications, designers should consider NXP's S32K series. The S912XET256J2MAG remains widely deployed in legacy and cost-sensitive CAN networks where FD bandwidth is unnecessary.

How many ADC channels does the S912XET256J2MAG provide, and what is their resolution?

The S912XET256J2MAG integrates two independent 12-bit analog-to-digital converters: ADC0 with 16 input channels and ADC1 with 8 input channels. ADC0 supports both single-ended and differential input modes, with a minimum conversion time of 8 µs. Both ADCs feature hardware trigger sources (ECT, PWM, or external pin), configurable sample-and-hold, and result alignment options - making the S912XET256J2MAG suitable for multi-sensor automotive monitoring tasks.

Is the S912XET256J2MAG pin-compatible with other HCS12X derivatives?

Yes - the S912XET256J2MAG uses a standardized 112-pin LQFP package shared across multiple HCS12X variants, including the MC9S12XEP100MAL and S912XEQ512J2MAG. Pin assignments for power, ground, reset, BDM, crystal, CAN, and major peripheral signals are identical. This enables drop-in replacement or scalable migration within the same PCB layout, provided flash/RAM and peripheral requirements align with the target variant's specifications.

What debug interface does the S912XET256J2MAG support?

The S912XET256J2MAG supports the Background Debug Mode (BDM) interface via the BKGD pin, enabling single-wire in-circuit debugging, flash programming, and real-time register/memory inspection without halting CPU execution. It is compatible with standard Freescale/NXP BDM debuggers (e.g., USB-ML-12, Cyclone Pro) and supports breakpoints, watchpoints, and live variable monitoring - essential for development and validation of the S912XET256J2MAG in automotive control applications.