NXP Semiconductors MC68HC908QY1CP

Overview

MC68HC908QY1CP from NXP (formerly Freescale) is an 8-bit HCS08-core microcontroller with 1 KB FLASH, 64 bytes RAM, internal RC oscillator (4 MHz typical), 8-pin SOIC package, and integrated ADC, KBI, AWU, COP watchdog, and LVI voltage monitor - designed for low-cost, space-constrained embedded control in consumer appliances and industrial sensors.

For engineers reviewing the MC68HC908QY1CP datasheet, MC68HC908QY1CP pinout, MC68HC908QY1CP application, or MC68HC908QY1CP equivalent, key selection criteria include its 8-pin SOIC footprint, 1 KB on-chip FLASH with block protection, 8-channel 8-bit ADC with software-triggered conversion, keyboard interrupt capability on Port A pins, and support for WAIT/STOP low-power modes with wake-up via IRQ, KBI, or AWU timer.

Technical Context

The MC68HC908QY1CP implements the M68HC08 CPU core with 16-bit address bus, 8-bit data path, and Harvard architecture memory mapping. It integrates a programmable 8-channel 8-bit ADC with configurable input clock prescaler and conversion trigger source (software or TIM overflow).

Its oscillator subsystem supports internal RC (4 MHz ±25%), external crystal (up to 8 MHz), or external clock input, with dynamic switching between sources and trimmable internal oscillator via OSCTRIM register at $FFC0. The SIM module provides centralized reset control, status flag management, and clock distribution to peripheral modules.

Key Specifications

Pinout & Package

MC68HC908QY1CP is housed in an 8-pin SOIC package (case 751BD-03) with 1.27 mm pitch, 4.9 mm × 3.9 mm body, and standard JEDEC MS-012AC outline. Pin functions are validated per Figure 1-2 and Table 1-2 of MC68HC908QY/QT Family Data Sheet, Rev. 6.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MC68HC908QY2CP and MC9RS08KA2CP, the MC68HC908QY1CP offers the lowest BOM cost and smallest footprint for minimal-control applications, while retaining full peripheral compatibility with the QY family - making it ideal for legacy cost-optimized designs where 1 KB FLASH is sufficient.

Availability

MC68HC908QY1CP is available at Aetrix Electronics and suitable for home appliance control, industrial sensor nodes, consumer remote interfaces, and smart lighting dimmers requiring stable component supply and long-term obsolescence management.

Supply support for MC68HC908QY1CP 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 (formerly Freescale Semiconductor) is a global leader in secure connectivity solutions for automotive, industrial, and IoT applications, with deep expertise in microcontrollers and mixed-signal ICs.

The MC68HC908QY1CP belongs to the M68HC08 QY/QT family - engineered for ultra-low-cost, low-pin-count embedded control in space- and budget-constrained applications such as white goods, power tools, and basic human-machine interfaces.

FAQ

What is the maximum operating frequency of the MC68HC908QY1CP?

The MC68HC908QY1CP supports a maximum system clock frequency of 8 MHz when driven by an external crystal or clock source. Its internal RC oscillator operates at 4 MHz typical (±25% over temperature and voltage), providing a zero-component clock option for non-timing-critical functions. The BUSCLK derived from either source drives the CPU and peripherals.

Does the MC68HC908QY1CP support in-circuit programming?

Yes, the MC68HC908QY1CP supports in-system programming via its single-wire background debug interface (BDM). No external high-voltage programmer is required - firmware updates can be performed through the dedicated BKGD pin using standard Freescale BDM tools, enabling field reprogramming and production-line flashing.

How many analog input channels does the MC68HC908QY1CP ADC support?

The MC68HC908QY1CP features an 8-bit successive-approximation ADC with 8 selectable analog input channels (AD0–AD7), mapped to Port A pins PTA2–PTA3 and Port B pins PTB0–PTB5. Channel selection is controlled via the ADC Input Select Register (ADSCR), allowing flexible sensor routing without external multiplexers.

Can the MC68HC908QY1CP wake up from STOP mode using the keyboard interrupt?

Yes, the MC68HC908QY1CP can wake from STOP mode via keyboard interrupt (KBI) on PTA0–PTA3. When KBI is enabled and configured for edge-sensitive wake-up, any transition on a KBI-enabled pin triggers an interrupt and resumes CPU execution - enabling ultra-low-power key-scan operation with typical STOP current below 1 µA.

Is the MC68HC908QY1CP pin-compatible with other QY-series devices?

Yes, the MC68HC908QY1CP shares identical 8-pin SOIC pinout and signal mapping with MC68HC908QY2CP and MC68HC908QY4CP. All QY-series variants use the same package, pin assignments, and peripheral register layout - allowing hardware reuse across memory variants and simplifying design scalability within the family.