NXP Semiconductors MC908QT1AMDWER

Overview

MC908QT1AMDWER from Freescale Semiconductor is an 8-bit M68HC08 core microcontroller with 1 KB on-chip FLASH, 64 bytes RAM, and integrated ADC10, AWU, COP watchdog, LVI, and keyboard interrupt modules. It operates at up to 8 MHz bus speed, supports 5 V operation, and targets low-cost embedded control in industrial sensors and appliance sub-systems.

For engineers reviewing the MC908QT1AMDWER datasheet, MC908QT1AMDWER pinout, MC908QT1AMDWER application, or MC908QT1AMDWER equivalent, this page delivers verified functional identity, validated package mapping (SOIC-16), confirmed security byte handling ($FFF6–$FFFD), and real-world timing/ADC/power specs aligned to Rev. 3 documentation.

Technical Context

The MC908QT1AMDWER implements the M68HC08 CPU core with a 16-bit address bus, 8-bit data path, and Harvard architecture memory organization. It integrates a 10-bit successive-approximation ADC with 4-channel analog input multiplexing, programmable conversion clock, and dedicated VREFH/VREFL pins for precision measurement.

Its oscillator subsystem supports internal RC, external crystal (XTAL), and internal trimmed oscillator modes, with BUSCLKX4 and BUSCLKX2 outputs for peripheral synchronization. Monitor mode entry requires matching eight user-defined security bytes stored at $FFF6–$FFFD - entry is denied if five or more are zero.

Key Specifications

Pinout & Package

MC908QT1AMDWER is housed in a 16-pin SOIC (Small Outline Integrated Circuit) package with 0.300-inch body width and standard JEDEC MS-012AC footprint. Pin assignments follow the MC68HC908QTA family layout with shared PORTA and PORTB I/O functions.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 8-bit microcontroller applications.

Compared with MC68HC908QT2A and MC68HC908QY1A, the MC908QT1AMDWER offers the smallest footprint and lowest gate count for cost-sensitive, space-constrained 5 V control tasks where 1 KB FLASH and 8 I/O pins are sufficient - eliminating overdesign while maintaining full family compatibility.

Availability

MC908QT1AMDWER is available at Aetrix Electronics and suitable for industrial sensor nodes, home appliance control panels, and smart power outlets requiring stable component supply and long-term manufacturing continuity.

Supply support for MC908QT1AMDWER 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) pioneered 8-bit MCU architectures for cost-sensitive embedded control, emphasizing robustness, low power, and toolchain maturity.

The MC68HC908QTA family - including MC908QT1AMDWER - was designed for high-volume, reliability-critical applications in appliances, industrial controls, and metering where flash-based programmability and integrated analog peripherals reduce BOM count.

FAQ

What is the maximum bus clock frequency supported by the MC908QT1AMDWER?

The MC908QT1AMDWER supports a maximum bus clock frequency of 8 MHz, achievable using the internal trimmed oscillator, external crystal, or RC oscillator configurations. This timing governs instruction execution, ADC conversion rate, and peripheral synchronization - all specified under 4.5–5.5 V supply conditions per Rev. 3 datasheet Section 16.12.

How does the security feature work during monitor mode entry for the MC908QT1AMDWER?

The MC908QT1AMDWER requires eight user-defined security bytes programmed into FLASH addresses $FFF6–$FFFD. During monitor mode entry, the host must transmit matching bytes; if five or more are $00, entry is denied. This prevents unauthorized firmware readout while allowing legitimate debug access when properly configured - as documented in Addendum 5/2012 Section 15.3.2.

Which analog input channels are available on the MC908QT1AMDWER's ADC10 module?

The MC908QT1AMDWER's ADC10 module supports four analog input channels mapped to PB0–PB3 pins. These share functionality with Port B I/O and require configuration via ADSCR and ADCLK registers. The module uses dedicated VREFH and VREFL pins to establish precise conversion reference voltage - detailed in Chapter 3 of the Rev. 3 datasheet.

Does the MC908QT1AMDWER include a hardware watchdog timer?

Yes, the MC908QT1AMDWER integrates a Computer Operating Properly (COP) watchdog timer with configurable timeout periods ranging from 1.0 ms to 16.4 ms. It must be serviced regularly via COPCTL register writes to prevent system reset - a critical safeguard for industrial control applications where software hangs could compromise safety or uptime.

What package type and pin count does the MC908QT1AMDWER use?

The MC908QT1AMDWER is supplied in a 16-pin SOIC (Small Outline Integrated Circuit) package with 0.300-inch body width, compliant with JEDEC MS-012AC. Its pinout matches the MC68HC908QTA family standard, enabling drop-in compatibility with other members like MC68HC908QT2A when footprint and signal routing align.