NXP Semiconductors MC68HC908QY1CDTE

Overview

MC68HC908QY1CDTE 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 oscillator with trimming, and integrated LVI, COP, and keyboard interrupt modules. It targets low-cost, space-constrained embedded control in consumer appliances and industrial sensors.

For engineers reviewing the MC68HC908QY1CDTE datasheet, MC68HC908QY1CDTE pinout, MC68HC908QY1CDTE application, or MC68HC908QY1CDTE equivalent, key selection criteria include its 16-pin SOIC footprint, internal RC oscillator accuracy (±2% typical after trim), 8-bit ADC resolution with software-selectable clock prescaler, and support for WAIT/STOP low-power modes with wake-on-IRQ/KBI.

Technical Context

The MC68HC908QY1CDTE implements the M68HC08 CPU core with 16-bit address bus and Harvard architecture memory map. Its oscillator module supports internal RC, external crystal, or external clock input, with OSCTRIM register enabling factory or field calibration of the internal oscillator frequency.

It integrates a System Integration Module (SIM) managing reset sources (power-on, COP, LVI, IRQ), interrupt vectors (IRQ, KBI, ADC, TIM), and low-power control (WAIT/STOP). The ADC uses a successive-approximation architecture with configurable conversion time (16–256 bus cycles) and supports single-shot or continuous mode.

Key Specifications

Pinout & Package

MC68HC908QY1CDTE is housed in a 16-pin SOIC (Small Outline IC) package with 1.27 mm pitch, 10.3 mm × 7.5 mm body size, and standard JEDEC MS-012AC outline. Pin 1 is marked by a notch or dot; pin numbering follows counterclockwise convention from top-left corner.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MC68HC908QY2CDTE and MC9RS08KA2CSCR, the MC68HC908QY1CDTE offers optimal cost and footprint for fixed-function, resource-constrained control where 1 KB FLASH suffices and KBI-driven wake-up is essential.

Availability

MC68HC908QY1CDTE is available at Aetrix Electronics and suitable for home appliance control, industrial sensor nodes, smart power outlets, and POS peripheral controllers requiring stable component supply and long-lifecycle support.

Supply support for MC68HC908QY1CDTE 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 company formed from the spin-off of Philips' semiconductor division, now specializing in secure connectivity solutions for automotive, industrial, and IoT markets.

The MC68HC908QY/QT family was designed by Freescale (acquired by NXP in 2015) for cost-sensitive, low-pin-count embedded control applications demanding integrated analog interfaces, robust reset supervision, and ultra-low-power operation.

FAQ

What is the maximum operating frequency of the MC68HC908QY1CDTE?

The MC68HC908QY1CDTE supports a maximum bus clock frequency of 8 MHz, derived from its internal RC oscillator (trimmed to ±2%), external crystal (1–8 MHz), or external clock source. The CPU executes instructions at this bus clock rate, with most instructions completing in 1–3 bus cycles. This frequency enables real-time control tasks while maintaining low power consumption in WAIT/STOP modes.

Does the MC68HC908QY1CDTE support in-circuit programming?

Yes, the MC68HC908QY1CDTE supports in-system programming (ISP) via its on-chip FLASH memory. Programming is performed using the MON (Monitor) mode through the BKGD pin (shared with Port A bit 7), requiring only a single-wire interface and no external high-voltage supply. The FLBPR register allows selective protection of FLASH pages to prevent accidental overwrite during field updates.

How does the keyboard interrupt (KBI) module function on the MC68HC908QY1CDTE?

The KBI module on the MC68HC908QY1CDTE monitors up to eight input lines (mapped to PTB0–PTB3 and PTA0–PTA3) for keypress events. It generates an interrupt on edge transition and can wake the device from WAIT or STOP mode. Configuration is done via KBISE and KBIE registers; debouncing is handled in firmware, and the module operates independently of the CPU during low-power states.

What are the voltage supply requirements for the MC68HC908QY1CDTE?

The MC68HC908QY1CDTE operates from a single supply voltage ranging from 2.7 V to 5.5 V. Its integrated Low-Voltage Inhibit (LVI) circuit provides hardware reset at programmable thresholds (e.g., 2.8 V or 3.8 V), ensuring reliable startup and brownout recovery. Operation below 2.7 V is not guaranteed, and VDD must remain within specification during all modes including STOP.

Is the MC68HC908QY1CDTE pin-compatible with other devices in the QY/QT family?

Yes, the MC68HC908QY1CDTE is pin-compatible with MC68HC908QY2CDTE and MC68HC908QY4CDTE in the same 16-pin SOIC package. All share identical pin assignments, electrical characteristics, and peripheral register maps. Firmware written for the QY1 will run unmodified on QY2/QY4, though higher-flash variants enable expanded functionality without hardware changes.