NXP Semiconductors MC9S12DG256CFUER

Overview

MC9S12DG256CFUER from NXP (formerly Freescale) is a 16-bit HCS12 microcontroller with 256 KB Flash, 12 KB RAM, and 4 KB EEPROM, featuring dual CAN 2.0A/B controllers, two SCI, three SPI, I²C, 10-bit dual 8-channel ADCs, 8/16-bit PWM, and an enhanced 16-bit 8-channel capture timer - deployed in automotive engine control units and industrial motor drives.

For engineers reviewing the MC9S12DG256CFUER datasheet, MC9S12DG256CFUER pinout, MC9S12DG256CFUER application, or MC9S12DG256CFUER equivalent, key selection criteria include CAN 2.0A/B compliance, 25 MHz bus speed at 5 V, on-chip BDM debug interface, 512-byte flash erase granularity, and 80-pin QFP package thermal rating of –40°C to +85°C.

Technical Context

The MC9S12DG256CFUER implements the HCS12 CPU core with opcode compatibility to 68HC11/68HC12, supporting 25 MHz bus operation at 5 V (40 ns min instruction cycle). It integrates two msCAN modules with five receive buffers and three transmit buffers each, programmable bit rates up to 1 Mbps, and FIFO-based receive architecture optimized for event-driven automotive networks.

Its clock generation uses a PLL with 1024 frequency options (÷16 to ×64), a clock monitor with self-clock mode, and real-time interrupt capability. The voltage regulator supports internal 2.5 V core supply from 5 V input, enabling single-rail system design without external LDOs.

Key Specifications

Pinout & Package

The MC9S12DG256CFUER is housed in an 80-pin Quad Flat Package (QFP) with 0.65 mm pitch and exposed pad for thermal dissipation. Pin functions are defined per the MC9S12DG256FS datasheet Rev 2, including dedicated CANH/CANL, SCI0/SCI1 TX/RX, SPI0/SPI1/SPI2 signals, and dual ATD reference inputs.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 16-bit automotive microcontroller applications.

Compared with MC9S12DG256CFUER, MC9S12DP256CPVE offers external bus capability but larger footprint, while S912XDP512J1MALR delivers superior compute throughput and memory at the cost of migration effort and higher BOM cost - both require layout changes and firmware adaptation.

Availability

MC9S12DG256CFUER is available at Aetrix Electronics and suitable for automotive ECU development, industrial motor control systems, and off-highway telematics requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MC9S12DG256CFUER 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 secure connectivity solutions for automotive, industrial, and IoT applications.

The MC9S12DG256CFUER belongs to NXP's legacy HCS12 microcontroller family, designed specifically for cost-sensitive, high-reliability automotive and industrial control applications requiring CAN networking, deterministic real-time performance, and field-upgradable Flash.

FAQ

What is the maximum operating frequency of the MC9S12DG256CFUER?

The MC9S12DG256CFUER operates at a maximum bus frequency of 25 MHz when supplied at 5 V, delivering a minimum instruction cycle time of 40 ns. This speed is achieved using the on-chip PLL clock generator, which supports multiplication factors up to ×64 from the base oscillator. The MC9S12DG256CFUER maintains full functionality across its specified temperature range (–40°C to +85°C) at this frequency.

Does the MC9S12DG256CFUER support CAN FD?

No, the MC9S12DG256CFUER does not support CAN FD. It implements two msCAN modules compliant exclusively with the ISO 11898-1 standard for Classical CAN (CAN 2.0A/B), with bit rates up to 1 Mbps. CAN FD capability was introduced in later NXP families such as S32K and S12Z, not in the HCS12 architecture. For CAN FD requirements, the MC9S12DG256CFUER must be replaced with a newer-generation MCU.

How many analog-to-digital converter channels does the MC9S12DG256CFUER have?

The MC9S12DG256CFUER features two independent 10-bit analog-to-digital converters: ATD0 and ATD1, each with eight input channels. Both support scan mode, software/hardware triggering, and variable sample-and-hold times. Simultaneous sampling across both converters enables an effective conversion time of 3.5 µs, making the MC9S12DG256CFUER suitable for multi-sensor feedback systems like motor phase current sensing.

Is the MC9S12DG256CFUER pin-compatible with other HCS12 devices?

The MC9S12DG256CFUER is part of a pin-compatible HCS12 family scaling from 32 KB to 512 KB Flash, but only within the same package variant. Specifically, it shares the 80-pin QFP footprint with MC9S12DG128CFUER and MC9S12DG64CFUER. However, peripheral enablement and memory mapping differ - for example, MC9S12DG256CFUER enables both CAN modules by default, whereas lower-memory variants may disable one. Always verify signal mapping in the specific device's pinout table.

What debug interface does the MC9S12DG256CFUER use?

The MC9S12DG256CFUER uses the Background Debug Mode (BDM) interface, a dedicated 6-pin serial debug port supporting real-time in-circuit emulation. It enables non-intrusive memory and register read/write at full operating speed, on-chip breakpoints, and flash programming without external emulators. The MC9S12DG256CFUER requires a compatible BDM tool such as USBMULTILINKBDM or M68CYCLONEPRO for development and field updates.