NXP Semiconductors MC908QT2AMFQE

Overview

MC908QT2AMFQE from Freescale Semiconductor is an 8-bit HCS08-core microcontroller with 2 KB on-chip FLASH, 128 B RAM, and integrated ADC10, AWU, COP watchdog, LVI, and keyboard interrupt modules. It operates at up to 8 MHz bus frequency, supports internal RC/XTAL oscillator options, and targets low-power embedded control in industrial sensors and appliance subsystems.

For engineers reviewing the MC908QT2AMFQE datasheet, MC908QT2AMFQE pinout, MC908QT2AMFQE application, or MC908QT2AMFQE equivalent, this page delivers verified technical context, package mapping, security byte configuration guidance, and real-world use-case validation for cost-sensitive, space-constrained MCU selection.

Technical Context

The MC908QT2AMFQE implements the HCS08 CPU core with 16-bit address space, supporting indexed, extended, and relative addressing modes. Its memory map includes 2 KB FLASH (with block protection and EEPROM emulation), 128 B RAM, and dedicated I/O register space mapped to $0000–$00FF.

It integrates a 10-bit successive-approximation ADC10 with 8 input channels, programmable clock division, and conversion completion interrupt; an Auto Wakeup Module (AWU) with selectable timebase (RC or bus clock); and a Computer Operating Properly (COP) watchdog with user-selectable timeout (1.0–4.1 ms). Security enforcement requires programming all eight bytes at $FFF6–$FFFD - monitor mode entry is denied if five or more are zero.

Key Specifications

Pinout & Package

MC908QT2AMFQE is housed in a 20-pin SOIC (Small Outline Integrated Circuit) package with 18 I/O pins, two power pins (VDD, VSS), and no dedicated reset pin - reset is asserted via internal LVI or external low pulse on IRQ pin.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MC908QT2AMFQE, the QT4A offers headroom for feature-rich firmware while maintaining full hardware compatibility; the QY2A trades analog capability and surface-mount packaging for ease of breadboarding and simplified BOMs in non-sensing roles.

Availability

MC908QT2AMFQE is available at Aetrix Electronics and suitable for industrial sensor nodes, home appliance control panels, smart thermostat subsystems, and POS terminal peripheral controllers requiring stable component supply and long-term manufacturability.

Supply support for MC908QT2AMFQE 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, cost-optimized microcontrollers for automotive, industrial, and consumer markets before its 2015 acquisition.

The MC908QT2AMFQE belongs to the HCS08-based QTA family, engineered for ultra-low-power, pin-efficient embedded control in resource-constrained applications where Flash density, analog integration, and security-aware debug access matter.

FAQ

What is the maximum operating frequency of the MC908QT2AMFQE?

The MC908QT2AMFQE supports a maximum bus clock frequency of 8 MHz, derived from its internal RC oscillator (calibrated 31.25 kHz), external crystal (up to 8 MHz), or external clock source. This frequency governs instruction execution speed, ADC conversion timing, and peripheral module responsiveness. The actual achievable frequency depends on supply voltage and temperature conditions specified in the electrical characteristics table.

Does the MC908QT2AMFQE include an analog-to-digital converter?

Yes, the MC908QT2AMFQE integrates a 10-bit successive-approximation ADC10 module with eight selectable input channels. It supports programmable sample time, conversion trigger sources (software, timer, or external event), and interrupt-on-completion. Input channels map to Port B pins PTB0–PTB2 and Port A pins PTA0–PTA4, enabling flexible analog sensing in compact designs.

How does the security feature work on the MC908QT2AMFQE?

The MC908QT2AMFQE enforces security by requiring eight user-defined bytes programmed into FLASH addresses $FFF6–$FFFD. During monitor mode entry, the host must transmit matching bytes; if five or more are zero, access is denied. This prevents unauthorized firmware readout. Users must program these locations-even if unused-as blank values compromise security integrity per Freescale's design guidance.

What package type is used for the MC908QT2AMFQE?

The MC908QT2AMFQE is supplied in a 20-pin Small Outline Integrated Circuit (SOIC) package with standard 0.3-inch body width and 0.050-inch lead pitch. This surface-mount package supports automated assembly and offers thermal and mechanical reliability for industrial-grade PCBs. Pin assignments follow the QTA family layout, ensuring compatibility with existing SOIC footprints for related variants like MC908QT4AMFQE.

Can the MC908QT2AMFQE operate from a single 3.3 V supply?

Yes, the MC908QT2AMFQE operates across a supply range of 2.7 V to 5.5 V, making it fully compatible with 3.3 V systems. At 3.3 V, the maximum bus frequency is reduced to 6 MHz (per electrical specs), and internal RC oscillator accuracy shifts slightly (±3% typical). All I/O pins are 5 V tolerant when configured as inputs, simplifying level-shifting in mixed-voltage designs.