NXP Semiconductors MC908QY2ACDWER

Overview

MC908QY2ACDWER from NXP Semiconductors (formerly Freescale) is an 8-bit HCS08 microcontroller with 2 KB Flash, 128 B RAM, and integrated ADC10, AWU, COP watchdog, LVI, and keyboard interrupt modules. It operates at up to 8 MHz bus clock, supports 2.7–5.5 V supply, and targets low-power embedded control in industrial sensors and appliance subsystems.

For engineers reviewing the MC908QY2ACDWER datasheet, MC908QY2ACDWER pinout, MC908QY2ACDWER application, or MC908QY2ACDWER equivalent, key selection criteria include its 16-pin SOIC-W package, internal RC oscillator trimming capability, FLASH security byte validation ($FFF6–$FFFD), and support for Wait/Stop low-power modes with wake-up via IRQ, KBI, or AWU.

Technical Context

The MC908QY2ACDWER implements the HCS08 CPU core with 16-bit address space, supporting indexed, extended, and relative addressing. Its memory map includes 2 KB of on-chip SuperFlash® (with page/mass erase and block protection), 128 B RAM, and 32 B EEPROM emulation.

Peripherals include a 10-bit ADC with 4-channel input multiplexing, Auto Wakeup Module with programmable timeout (1–1024 ms), and dual-clock domain operation-internal RC oscillator (±2% accuracy after trimming) and optional external crystal (1–8 MHz). Security enforcement requires eight user-defined bytes at $FFF6–$FFFD; monitor mode entry is denied if ≥5 are zero.

Key Specifications

Pinout & Package

MC908QY2ACDWER is housed in a 16-pin SOIC-W (Wide) package, 7.5 mm body width, 1.27 mm pitch, RoHS-compliant, with thermal pad not present.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MC908QY2ACDWER, the MC908QY4ACDWER offers double Flash/RAM in identical packaging for seamless firmware scaling, while the S9KEAZ128AMLH provides architectural upgrade path with modern peripherals-but requires PCB redesign and firmware re-architecture.

Availability

MC908QY2ACDWER is available at Aetrix Electronics and suitable for industrial sensor nodes, home appliance control panels, smart meter subsystems, and LED lighting drivers requiring stable component supply across long-lifecycle programs.

Supply support for MC908QY2ACDWER 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

NXP Semiconductors is a global semiconductor leader delivering secure, scalable solutions for automotive, industrial, IoT, and mobile applications, with roots in Freescale's embedded MCU heritage.

The MC908QY2ACDWER belongs to the legacy HCS08 QYxA family, designed specifically for cost-sensitive, ultra-low-power 8-bit control tasks in consumer and industrial equipment where minimal footprint and robustness outweigh processing complexity.

FAQ

What is the maximum bus clock frequency supported by the MC908QY2ACDWER?

The MC908QY2ACDWER supports a maximum bus clock frequency of 8 MHz. This is achieved using either the internal trimmed RC oscillator (calibrated to ±2% accuracy) or an external crystal/resonator up to 8 MHz. The bus clock drives all peripherals including ADC, TIM, and COP, and determines instruction execution speed - critical for real-time response in control loops.

Does the MC908QY2ACDWER include hardware-based security features?

Yes, the MC908QY2ACDWER implements FLASH security via eight user-programmable bytes stored at memory addresses $FFF6–$FFFD. Monitor mode entry is blocked unless the host sends matching bytes; entry is explicitly denied if five or more of those bytes are $00. This prevents unauthorized firmware readout during debug or field service, enhancing IP protection in deployed devices.

Can the MC908QY2ACDWER operate without an external crystal?

Yes, the MC908QY2ACDWER can operate fully from its internal RC oscillator, which is factory-trimmed and further adjustable via the OSCTRIM register to maintain ±2% accuracy across voltage and temperature. External crystal is optional and used only when higher timing precision is required - eliminating BOM cost and board space for crystal and load capacitors in cost-sensitive designs.

How does the Auto Wakeup Module (AWU) function in the MC908QY2ACDWER?

The AWU in the MC908QY2ACDWER generates a wake-up interrupt after a programmable delay ranging from 1 ms to 1024 ms, using only the internal RC oscillator - no external components needed. It operates in Stop and Wait modes, allowing the MCU to remain in ultra-low-power state until precise timing-driven wake-up, ideal for periodic sensor sampling or status polling in battery-powered applications.

What are the key low-power modes supported by the MC908QY2ACDWER?

The MC908QY2ACDWER supports two primary low-power modes: Wait Mode (CPU halted, peripherals active, wake via IRQ/KBI/AWU) and Stop Mode (all clocks stopped except AWU, current draw <1 µA). Both modes retain RAM content and register states. Stop Mode is entered via STOP instruction and exited by any enabled interrupt source - essential for multi-year battery life in remote sensing applications.