NXP Semiconductors S912XET256W1MAG

Overview

S912XET256W1MAG from NXP Semiconductors (formerly Freescale) is a 16-bit HCS12X microcontroller featuring a 256 KB on-chip flash memory, 14 KB RAM, and a 50 MHz S12X CPU core with XGATE co-processor. It integrates dual CAN 2.0B controllers, 12-bit ADC with 16 channels, 8-channel PWM, and enhanced capture timer modules. Designed for automotive body control and industrial motor control applications requiring deterministic real-time response.

For engineers reviewing the S912XET256W1MAG datasheet, S912XET256W1MAG pinout, S912XET256W1MAG application, or S912XET256W1MAG equivalent, this page delivers verified electrical specs, validated package mapping (112-pin LQFP), confirmed peripheral register sets (ECT, MSCAN, XGATE), and direct alternative part comparisons based on Freescale/NXP official derivative documentation.

Technical Context

The S912XET256W1MAG implements the S12X CPU12XV2 core with 5-stage pipeline, supporting both native S12X and legacy S12 instruction sets. Its memory subsystem includes 256 KB flash organized in 2 KB sectors with EEPROM emulation capability, and 14 KB of on-chip SRAM with MPU protection.

Peripheral integration follows the S12XE family architecture: dual MSCAN modules with independent message buffers, 16-channel 12-bit ADC0 with configurable sample-and-hold, 8-channel 8-bit PWM with center-aligned mode, and ECT16B8CV3 timer supporting input capture, output compare, and quadrature decoding - all accessible via dedicated PIM routing registers.

Key Specifications

Pinout & Package

112-pin Low-Profile Quad Flat Package (LQFP), thermally enhanced with exposed thermal pad. Pinout conforms to MC9S12XE-Family Reference Manual Rev. 1.25, Appendix B (Package Information) and Chapter 1.2.1 (Device Pinout).

Key Features

Applications

Equivalent & Alternatives

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

Compared with S912XET256W1MAG, the MC9S12XEP100MAL offers greater memory capacity in a smaller package but lacks pin compatibility, while the S912XEQ512J2MAG provides scalable flash/RAM headroom within the same 112-pin LQFP footprint - ideal for design migration paths.

Availability

S912XET256W1MAG is available at Aetrix Electronics and suitable for automotive body control modules, industrial motor drives, commercial vehicle telematics gateways, and off-highway equipment monitors requiring stable component supply across extended product lifecycles.

Supply support for S912XET256W1MAG 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 acquired Freescale Semiconductor in 2015 and maintains full support for the HCS12X portfolio, including long-term supply commitments and technical documentation updates.

The S12XE family - including S912XET256W1MAG - was engineered specifically for cost-sensitive, safety-aware automotive and industrial control applications demanding deterministic real-time performance, robust CAN connectivity, and field-proven reliability.

FAQ

What is the maximum operating frequency of the S912XET256W1MAG?

The S912XET256W1MAG operates at a maximum core frequency of 50 MHz, achieved via its internal phase-locked loop (PLL) that multiplies the external crystal oscillator input (typically 8 MHz). This frequency is sustained across the full industrial temperature range (-40°C to +125°C) and meets all timing specifications in the MC9S12XE-Family Reference Manual Rev. 1.25.

Does the S912XET256W1MAG support CAN FD?

No, the S912XET256W1MAG implements two standard MSCAN 2.0B controllers compliant with ISO 11898-1, supporting only classical CAN (up to 1 Mbps). It does not include CAN FD (Flexible Data-Rate) functionality, which was introduced in later NXP families such as S32K. The S912XET256W1MAG's CAN modules are fully documented in Chapter 16 of the MC9S12XE-Family Reference Manual Rev. 1.25.

How much user-accessible RAM does the S912XET256W1MAG provide?

The S912XET256W1MAG provides 14 KB of on-chip SRAM, all directly accessible to firmware for variables, stacks, and buffers. This memory is protected by the integrated Memory Protection Unit (MPU), allowing configurable read/write/execute permissions per region - a feature confirmed in Chapter 4 of the MC9S12XE-Family Reference Manual Rev. 1.25.

Is the S912XET256W1MAG pin-compatible with other S12XE derivatives?

The S912XET256W1MAG uses a 112-pin LQFP package shared with several S12XE variants (e.g., S912XEQ512J2MAG), but pin assignments differ across derivatives due to peripheral enablement and routing options. Pin compatibility must be verified per signal using the specific device's pinout table in Appendix B of the MC9S12XE-Family Reference Manual Rev. 1.25 - no universal pin-to-pin replacement exists within the family.

What debug interface does the S912XET256W1MAG support?

The S912XET256W1MAG supports the Background Debug Module (BDM) interface, a single-wire serial protocol defined in Chapter 7 of the MC9S12XE-Family Reference Manual Rev. 1.25. It enables non-intrusive debugging, flash programming, and real-time register inspection without requiring JTAG hardware or halting CPU execution during active CAN or ADC operations.