MC9S12DT256MPVE
MC9S12DT256MPVE - 16-bit HCS12 MCU, 256KB Flash, 112-LQFP | NXP
The NXP MC9S12DT256MPVE is a 16-bit HCS12 microcontroller with 256KB of on-chip Flash memory and a 112-pin LQFP package (20x20 mm), belonging to NXP's S12DT family of automotive-grade microcontrollers. It integrates the HCS12 CPU core running at up to 25 MHz (with internal bus speeds up to 50 MHz), two asynchronous serial communication interfaces (SCI), two SPI modules, an 8-channel IC/OC enhanced capture timer (ECT), two 8-channel 10-bit analog-to-digital converters (ATD), and 91 general-purpose I/O pins. The device also includes 12 KB of RAM and 4 KB of EEPROM for non-volatile data storage.
A microcontroller (MCU) is a single-chip computer that combines a CPU core, program memory (Flash/ROM), data memory (RAM), and programmable peripherals such as timers, ADCs, and communication interfaces. The HCS12 family belongs to the 16-bit MCU category, sitting between 8-bit microcontrollers (e.g., HC08, S08) and 32-bit ARM Cortex-M microcontrollers, and is widely used in automotive body, chassis, and powertrain applications where deterministic interrupt response and rich peripheral integration matter more than raw clock speed.
Key features include 256KB Flash for application code, 12KB RAM, 4KB EEPROM, two SCI, two SPI, an I2C-bus-compatible module, an 8-channel 16-bit enhanced capture timer, two 10-bit ATDs with 8 channels each, CAN 2.0A/B-compatible MSCAN module, and JTAG/BDM debug interface. The 112-LQFP package supports the full peripheral complement and 91 GPIO pins, while the wide 2.35V-2.75V supply is paired with internal voltage regulation.
The HCS12 core implements a CISC architecture with 16-bit ALU, X/Y index registers, and a von-Neumann memory map (unified Flash/RAM/EEPROM addressing). Background Debug Mode (BDM) allows non-intrusive in-circuit debugging and Flash programming via a single-pin interface, simplifying production test. The CAN (MSCAN) peripheral supports both standard (11-bit) and extended (29-bit) identifier frames, with programmable bit timing for bus rates up to 1 Mbps, suitable for automotive CAN networks.
Typical applications include automotive body control modules, instrument clusters, HVAC controllers, lighting modules, CAN nodes in vehicle networks, and industrial automation nodes requiring 16-bit processing, deterministic interrupts, and field-upgradeable Flash. The S12DT family is fully pin-compatible across derivatives, enabling scalable designs with different memory and peripheral mixes.
When designing with this part, allocate a robust watchdog refresh strategy and verify the BDM/debug pinout matches your programming fixture. The 112-LQFP package requires a 4-layer PCB with adequate thermal copper for production programming, and decoupling capacitors must be placed within 5 mm of each supply pin per NXP guidelines.
This page synthesizes distributor pricing, lifecycle status, same-package drop-in alternatives (S12 family variants and the XDT256 upgrade), and practical design notes not found in the manufacturer datasheet alone.
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