NXP Semiconductors MC9S08QD4CPC

Overview

MC9S08QD4CPC from NXP (formerly Freescale) is an 8-bit HCS08 microcontroller with 16 MHz CPU, 4 KB Flash, 256 B RAM, and integrated ADC, dual timers, and keyboard interrupt module - used in low-cost embedded control applications such as appliance motor interfaces and sensor signal conditioning.

For engineers reviewing the MC9S08QD4CPC datasheet, MC9S08QD4CPC pinout, MC9S08QD4CPC application, or MC9S08QD4CPC equivalent, key selection criteria include flash size, on-chip debug capability, ICS clock accuracy (±2% over voltage/temperature), and SOIC-8 package compatibility with legacy 8-pin MCU footprints.

Technical Context

The MC9S08QD4CPC implements the HCS08 CPU core with BGND instruction support and a single-wire background debug interface. It integrates an Internal Clock Source (ICS) with FLL-based frequency synthesis, enabling stable 16 MHz operation without external crystal.

Its peripheral set includes a 4-channel 10-bit ADC with hardware trigger from RTI, two independent timer modules (TIM1 with 2 channels, TIM2 with 1 channel), and a 4-pin keyboard interrupt module with software-selectable edge/level sensitivity - all operating within a 2.7–5.5 V supply range.

Key Specifications

Pinout & Package

MC9S08QD4CPC is housed in an 8-pin SOIC package (3.9 mm × 4.9 mm, 1.27 mm pitch) with exposed pad not present - suitable for reflow soldering and compact PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MC9S08QD4CPC, MC9S08QG4CDTE adds serial interfaces at the cost of increased pin count and layout complexity, while S9S08QD4F1MLC offers identical functionality with automotive qualification - making it a drop-in replacement where environmental robustness is critical.

Availability

MC9S08QD4CPC is available at Aetrix Electronics and suitable for appliance motor control, industrial sensor nodes, consumer remote interfaces, and smart lighting dimmers requiring stable component supply and long-term manufacturability.

Supply support for MC9S08QD4CPC 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 Freescale Semiconductor and Philips' semiconductor division, specializing in secure connectivity solutions for automotive, industrial, and IoT markets.

The MC9S08QD4CPC belongs to NXP's legacy HCS08 microcontroller family - designed for cost-sensitive, low-power embedded control applications where minimal external components and proven toolchain support are essential.

FAQ

What is the maximum operating frequency of the MC9S08QD4CPC?

The MC9S08QD4CPC features an HCS08 CPU core with a maximum bus frequency of 16 MHz, achieved using its internal clock source (ICS) with frequency-locked-loop (FLL) synthesis. This frequency is guaranteed across the full operating voltage range (2.7–5.5 V) and temperature range (–40°C to 85°C), and does not require an external crystal oscillator.

Does the MC9S08QD4CPC support in-circuit debugging?

Yes, the MC9S08QD4CPC supports single-wire background debug (BDM) via the BKGD/MS pin, enabling full in-circuit programming, real-time register inspection, and breakpoint debugging. It supports one hardware breakpoint during active debugging plus two additional breakpoints managed by the on-chip debug module - all without requiring dedicated debug headers or JTAG pins.

What are the memory resources available on the MC9S08QD4CPC?

The MC9S08QD4CPC includes 4096 bytes of on-chip Flash memory for program storage and 256 bytes of RAM for data and stack operations. Flash supports read/program/erase over full voltage and temperature ranges, with block protection enabled via the FPROT register to prevent unintended firmware modification during field updates or debug sessions.

Can the MC9S08QD4CPC operate without an external crystal?

Yes, the MC9S08QD4CPC operates fully from its internal clock source (ICS), which uses a frequency-locked-loop (FLL) driven by an internal reference. Precision trimming enables ±0.2% resolution and ±2% deviation over voltage and temperature - eliminating the need for external crystals or resonators in most cost-sensitive applications.

What is the ADC configuration of the MC9S08QD4CPC?

The MC9S08QD4CPC integrates a 10-bit, 4-channel analog-to-digital converter (ADC) with asynchronous clock source, automatic compare function, internal bandgap reference channel, and integrated temperature sensor. Conversions can be hardware-triggered by the RTI counter, supporting precise timing-critical sampling without CPU intervention.