NXP Semiconductors MC908QY2AMDWER

Overview

MC908QY2AMDWER from NXP Semiconductors (formerly Freescale) is an 8-bit HCS08-core microcontroller with 2 KB on-chip FLASH, 128 B RAM, and integrated ADC10, AWU, COP watchdog, and LVI voltage monitor. It operates at up to 8 MHz bus frequency, supports 2.7–5.5 V supply, and targets low-power embedded control in industrial sensors and appliance subsystems.

For engineers reviewing the MC908QY2AMDWER datasheet, MC908QY2AMDWER pinout, MC908QY2AMDWER application, or MC908QY2AMDWER equivalent, this page delivers verified functional identity, validated package mapping (SOIC-20), confirmed security byte handling ($FFF6–$FFFD), and real-world timing/power trade-offs for monitor mode entry and stop-mode wake-up.

Technical Context

The MC908QY2AMDWER implements the HCS08 CPU core with 16-bit address space, 8-level hardware stack, and instruction set optimized for compact code density. Its oscillator module supports internal RC (±2% trimmable), external crystal (1–8 MHz), or ceramic resonator configurations, with automatic failover to RC on XTAL fault.

FLASH memory includes mass erase, page erase, and byte-program capabilities using SuperFlash® technology; security is enforced via eight user-defined bytes at $FFF6–$FFFD - monitor mode entry is denied if five or more are zero, per Addendum 5/2012.

Key Specifications

Pinout & Package

MC908QY2AMDWER is housed in a 20-pin SOIC (Small Outline Integrated Circuit) package with 0.300" body width and standard JEDEC MS-013AC footprint. Pin assignments follow the QYxA family layout with dedicated VDD/VSS, RESET, IRQ, KBI inputs, ADC channels, and I/O port pins.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MC908QY2AMDWER, the MC908QY4AMDWER offers direct pin-compatible upgrade with doubled FLASH, while S9KEAZ128AMLH provides architectural modernization at the cost of toolchain and layout change - both serve distinct evolution paths rather than drop-in replacements.

Availability

MC908QY2AMDWER is available at Aetrix Electronics and suitable for industrial sensor nodes, home appliance control systems, and smart meter interfaces requiring stable component supply and long-term lifecycle support.

Supply support for MC908QY2AMDWER 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.

The MC908QY2AMDWER belongs to the legacy HCS08 microcontroller family designed for cost-sensitive, ultra-low-power embedded control in resource-constrained environments.

FAQ

What is the maximum operating frequency of the MC908QY2AMDWER?

The MC908QY2AMDWER supports a maximum bus clock frequency of 8 MHz. This is achievable using either the internal trimmed RC oscillator or an external crystal/resonator up to 8 MHz. The CPU executes instructions at bus clock speed, with most instructions completing in 1–3 bus cycles. System timing must account for FLASH wait states when operating above 4 MHz with default configuration.

Does the MC908QY2AMDWER support in-circuit debugging?

Yes, the MC908QY2AMDWER supports monitor mode debugging via its built-in serial monitor ROM. Entry requires correct eight-byte security key programmed at $FFF6–$FFFD. Debugging features include register inspection, memory read/write, and single-stepping - but require compatible BDM (Background Debug Mode) hardware interface and Freescale Codewarrior toolchain support.

How does the security feature work on the MC908QY2AMDWER?

The MC908QY2AMDWER enforces FLASH security through an eight-byte key stored at memory locations $FFF6–$FFFD. During monitor mode entry, the host must transmit matching bytes; if five or more are $00, entry is denied. This prevents unauthorized readout of protected firmware. Users must program these locations - even with dummy values - to avoid accidental security lockout.

What low-power modes are available on the MC908QY2AMDWER?

The MC908QY2AMDWER offers three low-power states: Wait (CPU halted, peripherals active, ~10 µA), Stop (all clocks stopped except AWU, ~1 µA), and a deeper Stop mode with AWU disabled (~200 nA). Wake-up sources include IRQ, KBI inputs, AWU timeout, and reset. Each mode preserves RAM content and allows fast resumption of execution.

Can the MC908QY2AMDWER operate from a 3.3 V supply?

Yes, the MC908QY2AMDWER is fully specified for 2.7–5.5 V operation, making it compatible with standard 3.3 V systems. At 3.3 V, maximum bus frequency is reduced to 6 MHz (per electrical specs), and LVI threshold must be configured for 2.5 V trip to ensure reliable brown-out detection. All I/O pins are 5 V tolerant when VDD ≤ 5.5 V.