NXP Semiconductors MC908KX2CDWE-NXP

Overview

MC908KX2CDWE-NXP from NXP (formerly Freescale) is an 8-bit HCS08-core microcontroller with 2 KB on-chip FLASH, 128 B RAM, and integrated ADC, SCI, TIM, KBI, and ICG modules. It operates at up to 8 MHz internal bus frequency, supports 2.7–5.5 V supply, and targets low-cost embedded control in industrial sensors and appliance subsystems.

For engineers reviewing the MC908KX2CDWE-NXP datasheet, MC908KX2CDWE-NXP pinout, MC908KX2CDWE-NXP application, or MC908KX2CDWE-NXP equivalent, key selection criteria include its 16-pin SOIC-W package, 8-channel 8-bit ADC with 10 µs conversion time, internal PLL-based clock generation with ±2% accuracy over temperature, and support for wait/stop low-power modes with wake-up via IRQ/KBI.

Technical Context

The MC908KX2CDWE-NXP implements the HCS08 CPU core with 16-bit address space, Harvard architecture instruction fetch, and 4-stage pipeline. Its Internal Clock Generator (ICG) uses a digitally controlled oscillator (DCO) with programmable trim and modulo-N divider to generate system clocks from 1 MHz to 8 MHz without external crystal.

The device integrates a 16-bit Timer Interface Module (TIM) with input capture, output compare, and PWM capability; a Serial Communications Interface (SCI) supporting asynchronous full-duplex UART operation; and a Keyboard Interrupt Module (KBI) with debounced scan logic for up to 5-key matrix interfaces.

Key Specifications

Pinout & Package

MC908KX2CDWE-NXP is housed in a 16-pin SOIC-W (Wide) package with 0.600-inch body width and 1.27 mm pitch. Pin assignments are defined per Figure 1-1 and Table 1-1 of Rev. 2.1 datasheet.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MC908KX2CDWE-NXP, the MC908KX8CDWE offers 4× more program memory while maintaining identical peripherals and footprint-ideal for firmware growth; the S9KEAZ128AMLH delivers modern ARM architecture and USB but requires PCB redesign and toolchain migration.

Availability

MC908KX2CDWE-NXP is available at Aetrix Electronics and suitable for industrial sensor nodes, home appliance control panels, motor drive subsystems, and smart power outlets requiring stable component supply across extended product lifecycles.

Supply support for MC908KX2CDWE-NXP 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 company headquartered in Eindhoven, Netherlands, specializing in secure connectivity solutions for automotive, industrial, and IoT markets.

The MC908KX2CDWE-NXP belongs to the legacy HCS08 microcontroller family, designed for cost-sensitive, low-power embedded control applications where deterministic real-time response and minimal BOM count are critical.

FAQ

What is the maximum operating frequency of the MC908KX2CDWE-NXP?

The MC908KX2CDWE-NXP supports a maximum bus frequency of 8 MHz, achieved via its internal clock generator's DCO and programmable divider. This frequency sets the upper limit for instruction execution speed and peripheral timing-e.g., SCI baud rate generation and ADC sampling intervals. The actual system clock is derived from the DCO output divided by values configured in the ICG multiplier and divider registers, and it remains stable across temperature and voltage within datasheet specifications.

Does the MC908KX2CDWE-NXP support in-circuit programming?

Yes, the MC908KX2CDWE-NXP supports in-circuit programming via its built-in monitor ROM and dedicated programming pins (OSC1/OSC2). Using the Freescale Background Debug Mode (BDM) protocol, firmware can be loaded, verified, and debugged without removing the device from the target board. The MC908KX2CDWE-NXP requires only a BDM interface adapter and compatible software such as CodeWarrior Development Studio to perform flash programming and real-time debugging.

Can the MC908KX2CDWE-NXP operate without an external crystal?

Yes, the MC908KX2CDWE-NXP can operate without an external crystal by enabling its internal digitally controlled oscillator (DCO) through the ICG module. The DCO provides clock frequencies from 1 MHz to 8 MHz with ±2% accuracy over –40°C to +85°C, making it suitable for applications where cost and board space constrain external timing components. External crystal or clock input remains optional for higher precision requirements.

What ADC features does the MC908KX2CDWE-NXP provide?

The MC908KX2CDWE-NXP integrates an 8-bit successive-approximation ADC with eight input channels, configurable sample-and-hold timing, and 10 µs maximum conversion time. It supports single-ended and differential input modes, software or hardware trigger sources (including TIM overflow), and automatic channel sequencing. The ADC uses VREFH as its high reference and VSS as low reference, and its result register is directly readable by firmware for immediate processing or storage.

Is the MC908KX2CDWE-NXP pin-compatible with other KX-series devices?

Yes, the MC908KX2CDWE-NXP is pin-compatible with the MC908KX8CDWE and MC908KX16CDWE in the same 16-pin SOIC-W package. All share identical pin assignments, electrical characteristics, and peripheral mapping-including PORTA, PORTB, IRQ1, OSC1/OSC2, VDD/VSS, and VREFH. This allows direct substitution for memory-scaling purposes without PCB changes, provided firmware accommodates differences in FLASH size and reset vector location.