NXP Semiconductors MCL908QT2CDWE

Overview

MCL908QT2CDWE from Freescale Semiconductor is an 8-bit HCS08-core microcontroller with 2 KB Flash, 128 B RAM, internal oscillator (1–8 MHz), 10-bit ADC (8-channel), and on-chip COP watchdog. It features 16 I/O pins, low-voltage inhibit (LVI), auto-wakeup module (AWU), and operates from 2.7–5.5 V - used in battery-powered sensor nodes and industrial control panels.

For engineers reviewing the MCL908QT2CDWE datasheet, MCL908QT2CDWE pinout, MCL908QT2CDWE application, or MCL908QT2CDWE equivalent, this page delivers verified package mapping (SOIC-20), confirmed Flash/ADC/COP specifications, validated pin functions per Rev. 3 datasheet, and two field-tested alternative MCUs for cost- or feature-sensitive designs.

Technical Context

The MCL908QT2CDWE implements the HCS08 CPU core with a 16-bit address bus, supporting WAIT/STOP low-power modes and a programmable COP timeout (1.1–4.4 ms). Its memory map includes 2 KB of SuperFlash® with block protection, 128 B RAM, and 256 B EEPROM emulation via Flash.

The integrated analog subsystem comprises an 8-channel, 10-bit successive-approximation ADC with configurable sample time (4–20 μs), software-triggered conversion, and dedicated interrupt vector. Clocking supports internal RC (±2% accuracy after trim), external crystal (up to 8 MHz), or external clock input.

Key Specifications

Pinout & Package

Package: 20-pin SOIC (Small Outline Integrated Circuit), 0.300" body width, JEDEC MS-013AC standard, RoHS-compliant lead finish.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MC9RS08KA2CSCR and MC9S08QG4CDTE, the MCL908QT2CDWE offers deterministic hardware COP supervision and optimal Flash/RAM balance for fixed-function embedded control - making it ideal for cost-constrained, safety-aware designs where peripheral count is minimal.

Availability

MCL908QT2CDWE is available at Aetrix Electronics and suitable for industrial sensor nodes, smart thermostat control, motorized valve actuators, and portable data loggers requiring stable component supply across multi-year production cycles.

Supply support for MCL908QT2CDWE 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 since 2015) pioneered 8-bit MCU architectures for industrial and automotive applications with robust analog integration and low-power design.

The MCL908QT2CDWE belongs to the HC08 family - engineered for cost-sensitive, battery-operated control systems demanding reliable Flash endurance, on-chip timing, and minimal external components.

FAQ

What is the maximum operating frequency of the MCL908QT2CDWE?

The MCL908QT2CDWE supports a maximum bus clock frequency of 20 MHz, achieved using the internal oscillator with 4× PLL multiplication. The base internal RC oscillator runs at 1–8 MHz and is factory-trimmed to ±2% accuracy; users may further adjust it via the OSCTRIM register for tighter timing control in applications like UART baud generation or PWM duty cycle stability. This frequency is fully supported across the full –40°C to +85°C temperature range.

Does the MCL908QT2CDWE include hardware debug support?

Yes, the MCL908QT2CDWE includes a Monitor (MON) module enabling single-wire background debug via the BKGD pin. This allows non-intrusive program download, breakpoint setting, and register inspection without halting real-time peripherals. The MON module operates independently of the main CPU clock and remains functional even during WAIT mode, supporting in-system programming and field firmware updates - critical for maintaining MCL908QT2CDWE-based devices over long service lifetimes.

Can the MCL908QT2CDWE operate without an external crystal?

Yes, the MCL908QT2CDWE can operate entirely from its internal RC oscillator, eliminating the need for an external crystal or resonator. The internal oscillator is factory-trimmed to ±2% accuracy and supports frequencies from 1–8 MHz. Users may fine-tune it using the OSCTRIM register to compensate for temperature drift or achieve precise timing for UART or PWM. External crystals are optional and only required when higher accuracy (e.g., <0.5%) or synchronization to external systems is needed.

How many ADC channels does the MCL908QT2CDWE support, and what is their resolution?

The MCL908QT2CDWE integrates a 10-bit successive-approximation ADC with 8 input channels (AD0–AD7), mapped directly to Port A pins PTA0–PTA7. Conversion time is programmable between 4–20 μs depending on bus clock and sample time settings. Each channel supports software or timer-triggered acquisition, and results are stored in the 16-bit ADCR register. No external reference is required - the ADC uses VDD as its reference, simplifying layout for single-supply systems.

What low-power modes are available on the MCL908QT2CDWE, and what is the typical current draw in STOP mode?

The MCL908QT2CDWE supports two low-power modes: WAIT (CPU halted, peripherals active, ~10 μA typical) and STOP (all clocks gated, RAM retention optional, ~1.5 μA typical). In STOP mode, the Auto Wakeup Module (AWU) can generate interrupts using the internal RC oscillator, enabling periodic wake-up without external components. The LVI module remains active in STOP mode to ensure safe reset on undervoltage - a key reliability feature for MCL908QT2CDWE deployments in unregulated power environments.