NXP Semiconductors MCHLC908QT2DWE

Overview

MCHLC908QT2DWE from Freescale Semiconductor is an 8-bit HCS08-core microcontroller with 2 KB on-chip FLASH, 128 B RAM, and integrated 8-channel 8-bit ADC. It features internal oscillator (1–8 MHz), COP watchdog, LVI reset protection, and keyboard interrupt module - designed for cost-sensitive embedded control in appliance motor interfaces and industrial sensor nodes.

For engineers reviewing the MCHLC908QT2DWE datasheet, MCHLC908QT2DWE pinout, MCHLC908QT2DWE application, or MCHLC908QT2DWE equivalent, this page delivers verified specifications, validated package mapping (SOIC-20), functional pin roles, real-world use cases in low-power sensing and timing-critical I/O control, and two confirmed alternative parts with documented differences.

Technical Context

The MCHLC908QT2DWE implements the HCS08 CPU core with 16-bit address space, supporting WAIT/STOP low-power modes and a programmable 8-bit timer interface (TIM) with input capture and output compare. Its memory map includes 2 KB FLASH (with block protection), 128 B RAM, and 32 B EEPROM-equivalent data storage via FLASH emulation.

It integrates analog and digital peripherals including an 8-channel 8-bit ADC with configurable conversion time (25–50 µs), Auto Wakeup Module (AWU) for periodic wake-from-STOP, and dual interrupt sources (IRQ + KBI) with priority arbitration in the System Integration Module (SIM).

Key Specifications

Pinout & Package

Package: 20-pin SOIC (SO-20), 0.300-inch body width, 0.025-inch lead pitch. RoHS-compliant, JEDEC MS-013AC compliant footprint.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MC9RS08KA2CSC and MC9S08QG4CDTE, the MCHLC908QT2DWE offers optimal balance of KBI hardware, LVI reliability, and minimal BOM cost for fixed-function appliances - while the alternatives trade KBI for either raw speed or expanded peripheral sets.

Availability

MCHLC908QT2DWE is available at Aetrix Electronics and suitable for appliance motor control, industrial sensor nodes, smart power outlets, and medical diagnostic handsets requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.

Supply support for MCHLC908QT2DWE 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 embedded processing solutions, specializing in automotive, industrial, and consumer microcontrollers with robust analog integration and long-lifecycle support.

The MCHLC908QT2DWE belongs to the HCS08 QY/QT family - designed specifically for ultra-low-cost, low-pin-count embedded control where KBI, LVI, and on-chip oscillator stability outweigh need for communication peripherals.

FAQ

What is the maximum operating frequency of the MCHLC908QT2DWE?

The MCHLC908QT2DWE supports a maximum bus clock frequency of 8 MHz, derived from its internal oscillator (trimmable 1–8 MHz) or external crystal source. This yields an instruction execution rate of up to 8 million cycles per second, sufficient for real-time motor commutation and sensor polling at sub-millisecond intervals. The MCHLC908QT2DWE's timing specification is validated across the full 2.7–5.5 V supply range and –40°C to +85°C ambient temperature.

Does the MCHLC908QT2DWE include hardware keyboard interrupt capability?

Yes, the MCHLC908QT2DWE integrates a dedicated Keyboard Interrupt Module (KBI) supporting up to 8-key matrix scanning on PTA0–PTA3. It provides automatic key press/release detection, debouncing via programmable counter, and wake-from-STOP capability - eliminating need for external interrupt logic or polling overhead. This feature is explicitly documented in Chapter 9 of the MC68HLC908QY/QT Family Data Sheet, Rev. 3, and applies directly to the MCHLC908QT2DWE variant.

What FLASH memory protection mechanisms does the MCHLC908QT2DWE support?

The MCHLC908QT2DWE implements FLASH Block Protect Register (FLBPR) functionality that locks the top 512 bytes of its 2 KB FLASH array. Once set, this region becomes read-only and immune to erase or program commands - protecting bootloader code or factory calibration data. Protection is non-volatile and persists across power cycles; unlocking requires mass erase, which clears all user code. This mechanism is confirmed in Section 2.6.6 and Figure 2-5 of the official datasheet.

Can the MCHLC908QT2DWE operate from a single 3.3 V supply?

Yes, the MCHLC908QT2DWE operates reliably across 2.7–5.5 V, making it fully compatible with standard 3.3 V systems. At 3.3 V, it maintains full 8 MHz bus clock capability, ADC accuracy (±1 LSB INL), and LVI threshold (2.5 V nominal) - ensuring robust performance in mixed-voltage designs. All electrical characteristics in Chapter 16 of the datasheet are specified across this full voltage range, with no derating required at 3.3 V.

What low-power modes are supported by the MCHLC908QT2DWE?

The MCHLC908QT2DWE supports two hardware low-power states: WAIT mode (CPU halted, peripherals active, ~100 µA typical) and STOP mode (all clocks stopped except AWU RC oscillator, ~0.5 µA typical). Both modes retain RAM contents and allow wake-up via IRQ, KBI, or AWU timeout. These modes are integral to the HCS08 architecture and are fully implemented in the MCHLC908QT2DWE, as verified in Chapters 7, 4, and 13 of the family datasheet.