NXP Semiconductors MC908QY2ACPE

Overview

MC908QY2ACPE 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 MC908QY2ACPE datasheet, MC908QY2ACPE pinout, MC908QY2ACPE application, or MC908QY2ACPE equivalent, this page delivers verified functional specifications, security byte handling at $FFF6–$FFFD, AWU-triggered wake-up timing, and direct replacement guidance for legacy QYxA-family designs.

Technical Context

The MC908QY2ACPE implements the HCS08 CPU core with 2 KB of SuperFlash® memory, supporting in-system programming and EEPROM emulation. It integrates a 10-bit ADC with 8 input channels, Auto Wakeup Module (AWU) with programmable timeout, and Low-Voltage Inhibit (LVI) with selectable trip points.

Its oscillator supports internal RC (1–8 MHz), external crystal, or ceramic resonator configurations; bus clock is derived as BUSCLKX4 or BUSCLKX2. Security enforcement requires user-programmed 8-byte pattern at $FFF6–$FFFD - monitor mode entry is denied if ≥5 bytes equal $00.

Key Specifications

Pinout & Package

MC908QY2ACPE is housed in a 28-pin plastic DIP (Dual In-line Package) with 0.6-inch body width and 0.1-inch pin pitch. Pin functions include 20 general-purpose I/O lines, 8 ADC inputs, RESET, IRQ, KBI0–KBI3, OSC1/OSC2, VDD/VSS, and dedicated AWU input.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MC908QY2ACPE, the MC908QY4ACPE offers double the FLASH capacity while maintaining full hardware compatibility, whereas the MC908QT2ACPE removes analog functionality and requires PCB layout revision due to non-identical pin assignments.

Availability

MC908QY2ACPE is available at Aetrix Electronics and suitable for home appliance control, industrial sensor interface, and consumer remote control applications requiring stable component supply and long-term manufacturing continuity.

Supply support for MC908QY2ACPE 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) was a leading designer of embedded processors and analog/mixed-signal ICs for automotive, industrial, and consumer markets.

The MC908QY2ACPE belongs to the HCS08-based QYxA family, engineered for cost-optimized, low-power 8-bit control in appliances and instrumentation where Flash density, ADC integration, and security features are critical.

FAQ

What is the maximum bus clock frequency supported by the MC908QY2ACPE?

The MC908QY2ACPE supports a maximum bus clock frequency of 20 MHz, achieved using the internal oscillator trimmed to 8 MHz and configured for ×2.5 multiplication, or via external crystal with appropriate PLL settings. This enables deterministic real-time response for motor control loops and sensor sampling at up to 100 kSPS.

How does the security feature of the MC908QY2ACPE prevent unauthorized FLASH access?

The MC908QY2ACPE enforces security by requiring eight user-defined bytes programmed at memory locations $FFF6–$FFFD. During monitor mode entry, the host must transmit matching bytes; if five or more are zero, monitor mode is denied. This prevents casual readout of firmware while allowing authorized debug access.

Can the MC908QY2ACPE operate from a single 3.3 V supply?

Yes, the MC908QY2ACPE operates across 2.7–5.5 V, making it fully compatible with 3.3 V systems. Its VDDA and VSSA pins allow separation of analog and digital power domains, and the LVI can be configured for 2.5 V trip point to ensure robustness during 3.3 V brown-out events.

What peripheral modules are integrated into the MC908QY2ACPE?

The MC908QY2ACPE integrates an HCS08 CPU core, 2 KB SuperFlash®, 128 B RAM, 10-bit ADC with 8 channels, Auto Wakeup Module (AWU), Computer Operating Properly (COP) watchdog, Low-Voltage Inhibit (LVI), Keyboard Interrupt (KBI), and System Integration Module (SIM) with clock control and reset management.

Is the MC908QY2ACPE pin-compatible with other members of the QYxA family?

Yes, the MC908QY2ACPE shares identical pinout and electrical characteristics with MC908QY1ACPE and MC908QY4ACPE in the 28-pin DIP package. Firmware and hardware designs targeting any QYxA variant can be reused directly, subject to FLASH size constraints and optional peripheral enable bits.