NXP Semiconductors MC68HC908QY1VPE

Overview

MC68HC908QY1VPE from NXP (formerly Freescale) is an 8-bit HCS08-core microcontroller in a 16-pin SOIC package, featuring 1 KB FLASH, 64 bytes RAM, 8-channel 8-bit ADC, on-chip internal oscillator (4 MHz nominal), and integrated KBI for keypad scanning - used in low-cost industrial control panels and appliance user interfaces.

For engineers reviewing the MC68HC908QY1VPE datasheet, MC68HC908QY1VPE pinout, MC68HC908QY1VPE application, or MC68HC908QY1VPE equivalent, key selection criteria include its 16-pin SOIC footprint, 1 KB FLASH with block protection, internal RC oscillator trim capability, and dedicated keyboard interrupt support without external components.

Technical Context

The MC68HC908QY1VPE implements the M68HC08 CPU core with 16-bit address bus and 8-bit data path, executing instructions at up to 4 MHz bus clock derived from its internal oscillator. It integrates a System Integration Module (SIM) managing reset, clock, and interrupt vectors, and supports WAIT/STOP low-power modes with wake-up via IRQ, KBI, or AWU.

Its analog subsystem includes an 8-channel single-ended ADC with programmable conversion clock prescaler and interrupt-on-complete functionality. The keyboard interrupt module (KBI) monitors up to 8 pins with configurable edge detection and auto-debounce timing, enabling direct matrix keypad interfacing.

Key Specifications

Pinout & Package

MC68HC908QY1VPE is housed in a 16-pin SOIC package (case 751BD-02), 7.5 mm × 10.3 mm body, 1.27 mm pitch, with standard JEDEC outline and 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 MC68HC908QY2VPE and MC9RS08KA2CFD, the MC68HC908QY1VPE offers the lowest entry-point cost and simplest migration path for legacy HCS08-based systems, while retaining full peripheral compatibility and proven reliability in high-volume consumer applications.

Availability

MC68HC908QY1VPE is available at Aetrix Electronics and suitable for industrial control panels, appliance user interfaces, and energy meter displays requiring stable component supply and long-term production continuity.

Supply support for MC68HC908QY1VPE 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 focused on secure connectivity solutions for automotive, industrial, and IoT markets, with deep heritage in 8-bit microcontroller innovation.

The MC68HC908QY series belongs to NXP's legacy HCS08 microcontroller family, designed specifically for cost-sensitive, low-pin-count embedded control applications where integration, reliability, and ease of certification matter most.

FAQ

What is the maximum operating frequency of the MC68HC908QY1VPE?

The MC68HC908QY1VPE operates with a maximum bus clock frequency of 4 MHz, derived from its internal RC oscillator. This frequency is factory-trimmed and remains stable across temperature and voltage within specification limits. External clock sources can also be used, but the internal oscillator is optimized for 4 MHz nominal operation - making the MC68HC908QY1VPE suitable for deterministic real-time control tasks without external timing components.

Does the MC68HC908QY1VPE support in-circuit programming?

Yes, the MC68HC908QY1VPE supports in-system programming (ISP) via its on-chip FLASH memory and background debug mode (BDM). Programming is performed using a standard BDM interface with compatible tools such as the P&E Micro USB-ML-12 or NXP DEMO9RS08KA2 evaluation board adapted for HCS08. No external programming voltage is required - the MC68HC908QY1VPE uses VDD for FLASH write/erase operations.

How many I/O pins does the MC68HC908QY1VPE provide?

The MC68HC908QY1VPE provides 12 general-purpose I/O pins: Port A (PTA0–PTA7) offers 8 pins, and Port B (PTB0–PTB3) adds 4 more. All pins are individually configurable as input or output via Data Direction Registers (DDRA/DDRB). Some pins have dual functions - e.g., PTA4 doubles as OSC2/BUSCLKX4, and PTB3 serves as the active-low RESET input - but retain GPIO capability when alternate functions are disabled.

Can the MC68HC908QY1VPE operate from a 3.3 V supply?

Yes, the MC68HC908QY1VPE is fully specified to operate across 2.7–5.5 V, including standard 3.3 V systems. Its internal oscillator, ADC, and I/O buffers maintain full functionality at 3.3 V, with adjusted timing parameters documented in the electrical specifications section of the datasheet. This makes the MC68HC908QY1VPE compatible with mixed-voltage designs and modern low-power subsystems without level translation.

What debug interface does the MC68HC908QY1VPE use?

The MC68HC908QY1VPE uses the Background Debug Mode (BDM) interface, implemented through a single dedicated pin (BKGD) shared with Port A bit 0 (PTA0). BDM enables non-intrusive debugging, flash programming, and real-time register inspection using standard NXP or third-party BDM tools. No additional JTAG adapter is needed - the MC68HC908QY1VPE's BDM protocol is fully supported by CodeWarrior Development Studio v6.3 and later versions.