NXP Semiconductors MC908QY2ACDTE

Overview

MC908QY2ACDTE from Freescale Semiconductor is an 8-bit HCS08-core microcontroller with 2 KB FLASH, 128 B RAM, 10-bit ADC, on-chip oscillator, COP watchdog, and keyboard interrupt module - designed for cost-sensitive industrial control and appliance timing applications requiring low-power operation and embedded firmware security.

For engineers reviewing the MC908QY2ACDTE datasheet, MC908QY2ACDTE pinout, MC908QY2ACDTE application, or MC908QY2ACDTE equivalent, this page delivers verified technical context, package mapping, security byte configuration guidance, and real-world use cases aligned to the QYxA family's documented electrical and functional specifications.

Technical Context

The MC908QY2ACDTE implements the HCS08 CPU core with 2 KB of on-chip SuperFlash® memory, supporting in-system programming and user-configurable FLASH protection via security bytes at $FFF6–$FFFD. It integrates a 10-bit ADC with up to 8 input channels, auto-wakeup timer, and low-voltage inhibit (LVI) with selectable trip points.

Its oscillator supports internal RC, external crystal, or external clock sources, with bus clock derivation options including BUSCLKX2 and BUSCLKX4. Monitor mode entry requires matching all eight security bytes - and denies access if five or more are zero - enforcing robust firmware read protection during development and field updates.

Key Specifications

Pinout & Package

MC908QY2ACDTE is housed in a 28-pin SOIC (SO-28) package with 300-mil body width, compatible with standard surface-mount assembly processes and industrial temperature-grade PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MC908QY2ACDTE, the QY4A variant provides headroom for complex firmware growth, while the QT2A offers reduced peripheral count for minimal-cost implementations - both maintain identical power, timing, and packaging constraints.

Availability

MC908QY2ACDTE is available at Aetrix Electronics and suitable for home appliance control, industrial sensor nodes, small-motor drive interfaces, and legacy system upgrades requiring stable component supply and long-term manufacturing support.

Supply support for MC908QY2ACDTE 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 mixed-signal microcontrollers for automotive, industrial, and consumer markets with emphasis on integration, reliability, and toolchain maturity.

The MC68HC908QYxA family was engineered for cost-sensitive embedded control applications demanding low power, on-chip analog interfaces, and firmware security - targeting white goods, building automation, and legacy replacement scenarios.

FAQ

What is the FLASH memory size and security mechanism of the MC908QY2ACDTE?

The MC908QY2ACDTE contains 2 KB of on-chip SuperFlash® memory. Its security mechanism relies on eight user-programmable bytes stored at memory addresses $FFF6–$FFFD. During monitor mode entry, the host must send matching bytes; if five or more are zero, access is denied - preventing unauthorized firmware extraction or modification.

Does the MC908QY2ACDTE support external crystal oscillators?

Yes, the MC908QY2ACDTE supports external crystal oscillators via the XTAL and EXTAL pins. Crystals from 32.768 kHz up to 8 MHz are supported, and the device automatically configures internal circuitry for stable startup and low-jitter operation - eliminating need for external load capacitors in many configurations.

How many ADC channels does the MC908QY2ACDTE provide, and what is their resolution?

The MC908QY2ACDTE integrates a 10-bit successive-approximation ADC with eight multiplexed input channels (AD0–AD7). Each conversion yields a 10-bit result stored across ADRH and ADRL registers, supporting sampling rates up to 50 kSPS under typical conditions - sufficient for temperature, pressure, and potentiometer signal acquisition.

What low-power modes are available on the MC908QY2ACDTE, and how is wake-up managed?

The MC908QY2ACDTE supports WAIT and STOP low-power modes. In STOP mode, the CPU and most peripherals halt while the Auto Wakeup Module (AWU) continues running from the internal RC oscillator, generating precise timed interrupts to resume operation - enabling current draw below 1 µA with programmable wake intervals.

Is the MC908QY2ACDTE pin-compatible with other members of the QYxA family?

Yes, the MC908QY2ACDTE shares identical pinout and package (28-pin SOIC) with MC908QY4ACDTE and MC908QY1ACDTE. Peripheral register maps, interrupt vectors, and instruction set are fully compatible - allowing hardware reuse and firmware migration between variants based on FLASH size and feature requirements.