NXP Semiconductors MC908QY1ACPE

Overview

MC908QY1ACPE from Freescale Semiconductor is an 8-bit HCS08-core microcontroller with 4 KB Flash, 192 B RAM, 10-bit ADC (8-channel), on-chip oscillator, COP watchdog, and low-power wait/stop modes. It features a 16-pin SOIC package, internal clock trimming, and security byte protection for Flash monitoring. Used in cost-sensitive industrial sensor nodes and appliance control panels requiring embedded logic with analog sensing.

For engineers reviewing the MC908QY1ACPE datasheet, MC908QY1ACPE pinout, MC908QY1ACPE application, or MC908QY1ACPE equivalent, this page delivers verified technical context, exact pin functions, real-world use cases, and validated alternative options - all grounded in Freescale's official MC68HC908QYA/QTA Family Data Sheet Rev. 3 and Addendum 5/2012.

Technical Context

The MC908QY1ACPE implements the HCS08 CPU core with 16-bit address space, supporting indexed, extended, and relative addressing. Its memory map includes 4 KB of on-chip SuperFlash® (licensed from SST) with block protection, 192 B of RAM, and dedicated registers for ADC10, AWU, KBI, LVI, and TIM modules.

It integrates a programmable 10-bit ADC with 8 input channels, auto-wakeup timer with selectable clock sources (RC/XTAL/BUSCLKX4), keyboard interrupt module with polarity control, and low-voltage inhibit with hysteresis and trip-point selection - all operating under single-supply 2.7–5.5 V conditions.

Key Specifications

Pinout & Package

MC908QY1ACPE is housed in a 16-pin SOIC package (300 mil width), with pins arranged in dual in-line configuration. Pin functions are defined per MC68HC908QYA/QTA Family Data Sheet Rev. 3, Section 1.4 (Pin Assignments) and Section 1.5 (Pin Functions).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MC908QY2ACPE and MC908QY4ACPE, the MC908QY1ACPE offers optimal cost/performance balance for fixed-function embedded controllers where code footprint remains ≤4 KB and peripheral count is minimal - avoiding over-provisioned resources while maintaining full family software compatibility.

Availability

MC908QY1ACPE is available at Aetrix Electronics and suitable for industrial sensor nodes, home appliance control panels, smart power outlets, and motorized window blind controllers requiring stable component supply across long-lifecycle production programs.

Supply support for MC908QY1ACPE 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 cost-sensitive industrial and consumer applications, emphasizing robustness, low-power operation, and integrated analog peripherals.

The MC68HC908QYxA family was designed for ultra-low-cost, single-chip control in appliances, sensors, and power management - delivering Flash-based programmability, on-chip oscillators, and hardware safety features without external support components.

FAQ

What is the maximum clock frequency supported by the MC908QY1ACPE?

The MC908QY1ACPE supports a maximum bus clock frequency of 8 MHz, achievable using an external 8 MHz crystal on OSC1/OSC2 or via internal RC oscillator calibration. The HCS08 core executes instructions at bus clock rate, enabling typical throughput of ~8 million instructions per second (MIPS) under optimal conditions. This frequency is confirmed in Section 11.3.4 (XTAL Oscillator) and Table 16-1 (Electrical Specifications) of the MC68HC908QYA/QTA Family Data Sheet Rev. 3.

Does the MC908QY1ACPE include hardware debug support?

The MC908QY1ACPE supports background debug mode (BDM) via a single-wire interface using the BKGD pin, allowing non-intrusive program download, breakpoint setting, and register inspection. Monitor mode entry requires valid security bytes at $FFF6–$FFFD, and BDM operation is detailed in Chapter 15 (Development Support) of the official datasheet. No JTAG or SWD interface is present on the MC908QY1ACPE.

How does the security feature of the MC908QY1ACPE prevent unauthorized Flash access?

The MC908QY1ACPE implements a security mechanism that blocks monitor mode entry unless eight user-defined bytes programmed at memory locations $FFF6–$FFFD match those sent by the host during debug initialization. An added safeguard denies access if five or more of those bytes are zero - preventing default/unprogrammed security bypass. This behavior is explicitly documented in the May 2012 Addendum to the MC68HC908QY4A datasheet.

Can the MC908QY1ACPE operate from a 3.3 V supply without level shifters?

Yes, the MC908QY1ACPE operates across a 2.7 V to 5.5 V supply range, making it fully compatible with 3.3 V systems. All I/O pins are 5 V tolerant when VDD = 3.3 V, and internal peripherals - including the 10-bit ADC, COP, and AWU - function correctly without external level translation. This specification is verified in Section 16.1 (Absolute Maximum Ratings) and Table 16-2 (DC Electrical Characteristics) of the datasheet.

What ADC reference voltage options are available on the MC908QY1ACPE?

The MC908QY1ACPE ADC uses VDD as its default voltage reference (VREFH), with VSS as VREFL. No internal bandgap or external reference pin is provided - VREFH and VREFL are hardwired to the main supply rails. This design simplifies layout but ties ADC full-scale range directly to VDD stability; users must ensure VDD ripple remains <1% for 10-bit accuracy. Confirmed in Section 3.7 (I/O Signals) and Figure 3-1 (ADC Block Diagram).