NXP Semiconductors MC908QT2AMDWE

Overview

MC908QT2AMDWE from Freescale Semiconductor is an 8-bit HCS08-core microcontroller with 2 KB FLASH, 128 B RAM, and integrated ADC10, AWU, COP watchdog, and LVI protection. It operates at up to 8 MHz bus frequency, supports 3.0–5.5 V supply, and targets low-power embedded control in industrial sensors and appliance subsystems.

For engineers reviewing the MC908QT2AMDWE datasheet, MC908QT2AMDWE pinout, MC908QT2AMDWE application, or MC908QT2AMDWE equivalent, this page delivers verified functional identity, validated package mapping (SOIC-20), confirmed security byte handling ($FFF6–$FFFD), and real-world timing/ADC/power specifications directly traceable to Freescale's MC68HC908QYA/QTA Family Data Sheet Rev. 3 and Addendum 5/2012.

Technical Context

The MC908QT2AMDWE implements the HCS08 CPU core with 16-bit address space, uses SuperFlash® technology for 100K-cycle FLASH endurance, and features a programmable internal oscillator trimmed via register-accessible calibration bytes. Its ADC10 module supports 10-bit resolution with 8-channel analog input multiplexing and configurable conversion clock division.

Security enforcement occurs during monitor mode entry: host must supply eight matching bytes to $FFF6–$FFFD; entry is denied if ≥5 of those bytes are $00. The AWU module enables wake-up from Stop/Wait modes using programmable timebase intervals derived from internal RC or external crystal sources.

Key Specifications

Pinout & Package

MC908QT2AMDWE is housed in a 20-pin SOIC (Small Outline Integrated Circuit) package with 0.300-inch body width and standard 1.27 mm pitch. Pin assignments follow the MC68HC908QYA/QTA family layout, including dedicated VDD/VSS, RESET, IRQ, KBI inputs, ADC channel pins (AD0–AD3), and port I/O lines.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MC908QT2AMDWE, the QT4A variant offers double FLASH capacity for complex control algorithms, while the QY2A reduces pin count and peripheral count - both retain identical HCS08 core behavior, security model, and low-power architecture but differ in memory scalability and I/O density.

Availability

MC908QT2AMDWE is available at Aetrix Electronics and suitable for industrial sensor nodes, home appliance control units, and smart thermostat interfaces requiring stable component supply and long-term lifecycle support.

Supply support for MC908QT2AMDWE 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) designed high-reliability, low-power microcontrollers for automotive, industrial, and consumer applications.

The MC68HC908QYA/QTA family - including MC908QT2AMDWE - was engineered for cost-sensitive embedded control tasks demanding integrated analog peripherals, robust security, and ultra-low-power operation in resource-constrained environments.

FAQ

What is the maximum operating frequency of the MC908QT2AMDWE?

The MC908QT2AMDWE supports a maximum bus clock frequency of 8 MHz, derived from its internal oscillator (trimmed RC), external crystal, or ceramic resonator. This frequency defines instruction execution speed and peripheral timing constraints - for example, ADC conversion time scales inversely with bus clock, and TIM module resolution depends directly on BUSCLKX4. All electrical specifications in the Freescale datasheet assume operation within this limit.

Does the MC908QT2AMDWE include hardware security features?

Yes, the MC908QT2AMDWE implements a FLASH security mechanism that restricts unauthorized access during monitor mode. Entry requires transmission of eight user-defined security bytes matching those stored at memory locations $FFF6–$FFFD. Critically, the addendum specifies that monitor mode entry is denied if five or more of these bytes are zero - preventing weak keys. This feature is active by default and requires explicit programming of all eight bytes for secure deployment.

How much RAM and FLASH memory does the MC908QT2AMDWE have?

The MC908QT2AMDWE integrates 128 bytes of on-chip SRAM for runtime variables and stack operations, and 2 KB of on-chip SuperFlash® memory for program code and non-volatile data storage. The FLASH supports 100,000 erase/write cycles and includes block protection registers to prevent accidental overwrite of critical firmware sections - essential for field-upgradable devices using the MC908QT2AMDWE.

Which analog-to-digital converter capabilities does the MC908QT2AMDWE provide?

The MC908QT2AMDWE includes a 10-bit ADC10 module with eight input channels (AD0–AD7), though only AD0–AD3 are routed to pins in the 20-pin SOIC package. It supports programmable sample time, configurable clock division, and interrupt-on-conversion completion. Conversion results are stored in two 8-bit registers (ADRH/ADRL), and the module operates independently of CPU activity - enabling low-power sampling during Wait mode without sacrificing accuracy.

What low-power modes are supported by the MC908QT2AMDWE?

The MC908QT2AMDWE supports three low-power states: Normal, Wait, and Stop. In Wait mode, the CPU halts but peripherals (ADC, AWU, TIM) remain clocked; in Stop mode, all clocks halt except the AWU counter, achieving sub-1 µA current draw. Both modes are exited via IRQ, KBI, or AWU timeout. These modes are controlled via STOP instruction and CONFIG register bits, and their behavior is fully documented in Chapter 13 (SIM) and Chapter 4 (AWU) of the MC68HC908QYA/QTA Family Data Sheet.