NXP Semiconductors MC9S12DG256CCFU

Overview

MC9S12DG256CCFU from Freescale Semiconductor is a 16-bit HCS12 microcontroller with 256 KB on-chip Flash EEPROM, 12 KB RAM, and integrated CAN 2.0B controller, designed for automotive body control and industrial embedded applications requiring deterministic real-time response, robust communication, and nonvolatile program storage. It operates at up to 25 MHz bus clock, supports 8-channel 10-bit ATD conversion, and features 56 general-purpose I/O pins in an 80-pin QFP package.

For engineers reviewing the MC9S12DG256CCFU datasheet, MC9S12DG256CCFU pinout, MC9S12DG256CCFU application, or MC9S12DG256CCFU equivalent, key selection criteria include its 256 KB Flash endurance (10k erase/write cycles), dual CAN interface capability, PLL-based clock generation with external crystal or oscillator input, and support for background debug mode via BKGD pin - all critical for ECU firmware development and production validation.

Technical Context

The MC9S12DG256CCFU implements the HCS12 CPU core with 16-bit data path, 24-bit address space, and enhanced BDM debugging interface. Its CRG block integrates a PLL with programmable SYNR/REFDV registers, enabling bus clock frequencies of 8–25 MHz from a 4–8 MHz crystal input.

It includes two independent MSCAN modules (CAN 2.0B compliant), a 10-bit 16-channel ATD converter with configurable sample-and-hold timing, and an 8-channel PWM subsystem with center-aligned and edge-aligned modes - all mapped into a unified memory space with banked addressing for Flash, RAM, and peripheral registers.

Key Specifications

Pinout & Package

MC9S12DG256CCFU is housed in an 80-pin QFP package (case number 841B) with exposed thermal pad, rated for industrial temperature range (−40°C to +85°C) and 3.3 V / 5 V tolerant I/O.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MC9S12DJ256CPVE and S912XDP512J1MALR, the MC9S12DG256CCFU offers optimal balance of compact 80-pin packaging, proven automotive qualification, and sufficient peripherals for cost-sensitive body electronics - making it ideal for volume production where footprint and legacy toolchain compatibility are critical.

Availability

MC9S12DG256CCFU is available at Aetrix Electronics and suitable for automotive body electronics, industrial motor control, and telematics gateway applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for MC9S12DG256CCFU 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

Freescale Semiconductor (now part of NXP Semiconductors) is a global leader in automotive and industrial microcontrollers, known for robust silicon design, ASIL-compliant safety features, and broad ecosystem support.

The MC9S12DG256CCFU belongs to the HCS12 family, engineered specifically for cost-effective, real-time automotive control applications where reliability, CAN integration, and debuggability are essential.

FAQ

What is the maximum bus clock frequency supported by the MC9S12DG256CCFU?

The MC9S12DG256CCFU supports a maximum bus clock frequency of 25 MHz, achieved through its integrated PLL using a 4–8 MHz external crystal. This frequency is confirmed in the device user guide's PLL characteristics table (A-16), where tCQOUT max is specified at 2.5 ns for 25 MHz operation. The PLL configuration requires proper SYNR and REFDV register settings to stabilize within specification.

Does the MC9S12DG256CCFU include built-in CAN controllers?

Yes, the MC9S12DG256CCFU integrates two fully compliant MSCAN modules supporting CAN 2.0B protocol (ISO 11898-1:2003). Each module has dedicated TX/RX pins (e.g., PM7/PM6 for MSCAN0), 16 message buffers, and programmable acceptance filtering. These are documented in Section 18 of the user guide and electrical specs Table A-6.

What package type and pin count does the MC9S12DG256CCFU use?

The MC9S12DG256CCFU uses an 80-pin QFP package (case number 841B), as confirmed in Figure 2-2 ("Pin Assignments in 80-pin QFP for MC9S12DG256") and Appendix B.3 of the device user guide. It measures 14 × 14 mm with 0.65 mm lead pitch and includes an exposed thermal pad for improved heat dissipation.

How much Flash and RAM memory does the MC9S12DG256CCFU provide?

The MC9S12DG256CCFU provides 256 KB of on-chip Flash EEPROM and 12 KB of on-chip RAM. Flash endurance is rated at 10,000 erase/write cycles with 10-year data retention, and RAM includes both general-purpose and peripheral-mapped regions. These values are specified in Table 1-1 (Memory Map) and Table A-12 (NVM Reliability).

Is the MC9S12DG256CCFU compatible with background debugging tools?

Yes, the MC9S12DG256CCFU supports Background Debug Mode (BDM) via the BKGD pin, enabling in-circuit programming, real-time register inspection, and non-intrusive breakpointing without halting the CPU. BDM functionality is detailed in Section 2.3.6 and Chapter 4 of the user guide, and requires no external JTAG adapter.