NXP Semiconductors MC9S12DB128CFUE

Overview

MC9S12DB128CFUE from Freescale Semiconductor is a 16-bit automotive microcontroller featuring CPU12 core, 128KB Flash EEPROM, 8KB RAM, 2KB EEPROM, dual 10-bit ADCs (16-channel total), eight PWM channels, two SCIs, two SPIs, I²C, J1850 BDLC, and two CAN 2.0A/B modules - deployed in body control modules and powertrain gateways requiring deterministic real-time response and CAN-based vehicle networking.

For engineers reviewing the MC9S12DB128CFUE datasheet, MC9S12DB128CFUE pinout, MC9S12DB128CFUE application, or MC9S12DB128CFUE equivalent, this page delivers verified memory mapping, validated 112-pin LQFP package details, confirmed CAN/J1850 coexistence capability, and precise peripheral routing constraints per Freescale's MC9S12D-Family Product Brief Rev 6.1.

Technical Context

The MC9S12DB128CFUE implements the HCS12 instruction set with upward compatibility to M68HC11, including identical interrupt stacking and programmer's model. Its System Integration Module (SIM) manages clock generation via PLL (enabling 25 MHz bus speed), reset control, interrupt prioritization, and multiplexed external bus interface supporting both 16-bit wide and 8-bit narrow modes.

Peripheral routing is software-configurable: CAN0 shares pins with J1850 BDLC on PM1:0; CAN4 shares pins with I²C on PJ7:6; SPI2 maps to PH7:4 in 112-pin packages. The device supports Wake-Up from STOP/WAIT via 22 dedicated interrupt-capable I/O lines across Ports H, P, J, and IRQ/XIRQ.

Key Specifications

Pinout & Package

MC9S12DB128CFUE uses a 112-pin LQFP package (Freescale case no. 987) with 0.65 mm pitch, 20 mm × 20 mm body, and exposed thermal pad. I/O pins support 5 V tolerant inputs and outputs; analog inputs (AN0–AN15) and supply rails (VDDA/VSSA/VRH/VRL) are optimized for 5 V A/D conversion. Logic operates at 2.5 V internal supply (VDDR/VSSR) regulated from 5 V input.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MC9S12DB128CFUE, MC9S12DG128CPVE removes J1850 but retains identical CAN/peripheral timing and memory layout - simplifying migration where diagnostics are handled externally. S912XDP512J0VLQ adds XGATE acceleration and larger memory, enabling complex gateway logic without external co-processors.

Availability

MC9S12DB128CFUE is available at Aetrix Electronics and suitable for automotive body control modules, powertrain gateways, seat position controllers, and roof modules requiring stable component supply across extended temperature ranges (−40°C to +125°C).

Supply support for MC9S12DB128CFUE 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 fabless semiconductor company specializing in automotive, industrial, and networking processors and analog solutions.

The MC9S12D-Family was designed specifically for automotive multiplexing applications, emphasizing pin compatibility across memory/peripheral variants to enable scalable ECU development with minimal PCB redesign.

FAQ

What is the maximum bus speed supported by the MC9S12DB128CFUE?

The MC9S12DB128CFUE supports a maximum bus speed of 25 MHz in single-chip mode, achieved via its integrated PLL circuit multiplying a 4–8 MHz crystal reference. This corresponds to a 50 MHz core-equivalent performance. In expanded bus modes, the maximum bus speed is 20 MHz (40 MHz core-equivalent), as confirmed in Freescale's MC9S12D-Family Product Brief Rev 6.1. The MC9S12DB128CFUE achieves this timing while maintaining full 16-bit data path integrity and deterministic interrupt latency.

Does the MC9S12DB128CFUE support both CAN and J1850 on the same physical pins?

Yes - the MC9S12DB128CFUE routes CAN0 and J1850 BDLC functions to the same PM0/PM1 pins. Software configuration determines whether those pins operate as CAN0 RX/TX or J1850 RXB/TXB; they cannot function simultaneously in both modes. This pin-sharing is explicitly documented in the "Pin out explanations" section and Figure 1 of the MC9S12D-Family Product Brief Rev 6.1. The MC9S12DB128CFUE thus provides flexibility for legacy diagnostics or modern CAN-only designs within the same footprint.

How many analog input channels does the MC9S12DB128CFUE support, and what is their resolution?

The MC9S12DB128CFUE integrates two 10-bit, 8-channel analog-to-digital converters (ATD0 and ATD1), supporting up to 16 total analog inputs (AN0–AN15). Each converter provides true 10-bit resolution with programmable sample-and-hold timing and external conversion trigger capability. This specification is confirmed in Table 1 and the "Analog-to-Digital Converters" feature list of the MC9S12D-Family Product Brief Rev 6.1. The MC9S12DB128CFUE uses these ADCs for sensor monitoring in body control and motor feedback applications.

What debug interface does the MC9S12DB128CFUE provide, and how many pins are required?

The MC9S12DB128CFUE features Freescale's single-wire Background Debug Mode (BDM) accessed via the MODC (BKGD) pin, requiring only one dedicated signal plus VDD and VSS for full in-circuit debugging, flash programming, and real-time trace. This is documented in the "Development support" section and block diagram of the MC9S12D-Family Product Brief Rev 6.1. Unlike multi-wire JTAG, the MC9S12DB128CFUE's BDM minimizes PCB routing complexity while delivering full breakpoint and memory access capability during development and field calibration.

Is the MC9S12DB128CFUE pin-compatible with other members of the MC9S12D-Family?

Yes - all MC9S12D-Family members, including the MC9S12DB128CFUE, are fully pin-compatible within the same package variant (112-pin LQFP or 80-pin QFP). This enables memory and peripheral scalability without PCB redesign, as stated in the first paragraph of the MC9S12D-Family Product Brief Rev 6.1. The MC9S12DB128CFUE shares identical pin assignments with MC9S12DT128 and MC9S12DJ128 in 112LQFP, differing only in Flash/RAM/EEPROM size and enabled peripherals (e.g., J1850 presence).