NXP Semiconductors MC9S08QD4CSC

Overview

MC9S08QD4CSC 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 cost-sensitive embedded control applications such as small appliance motor control and sensor interface modules.

For engineers reviewing the MC9S08QD4CSC datasheet, MC9S08QD4CSC pinout, MC9S08QD4CSC application, or MC9S08QD4CSC equivalent, key selection criteria include its 8-pin SOIC package, single-wire background debug interface, internal clock source with ±2% accuracy over voltage/temperature, and support for Wait + three Stop power modes.

Technical Context

The MC9S08QD4CSC implements the HCS08 CPU core with HC08 instruction set extension (including BGND), supporting up to 32 interrupt/reset sources and hardware-triggered ADC conversions via RTI. Its ICS module uses a frequency-locked loop (FLL) with precision-trimmed internal reference for stable bus clock generation.

Peripheral integration includes TIM1 (2-channel timer/PWM), TIM2 (1-channel timer/PWM), KBI (4-pin keyboard interrupt with software-selectable edge/level sensitivity), and ADC10V1 (4-channel, 10-bit with temperature sensor and bandgap reference). All peripherals operate under active, Wait, and Stop2/Stop3 modes.

Key Specifications

Pinout & Package

MC9S08QD4CSC is housed in an 8-pin SOIC package (3.9 mm × 4.9 mm, 1.27 mm pitch), RoHS-compliant, with exposed pad not present. Pin functions are validated per Freescale MC9S08QD4 Rev. 7 datasheet Section 2.1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MC9S08QD4CSC, MC9S08QG4CDT adds communication peripherals at the cost of larger footprint and higher pin count, while S9S08QD4F1MLC offers identical functionality with automotive qualification - making MC9S08QD4CSC optimal for industrial and consumer cost-sensitive designs requiring minimal I/O and compact packaging.

Availability

MC9S08QD4CSC is available at Aetrix Electronics and suitable for small-appliance motor control, battery-powered sensor nodes, smart power outlets, and consumer remote control interfaces requiring stable component supply and long-term industrial availability.

Supply support for MC9S08QD4CSC 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 MC9S08QD4CSC belongs to NXP's legacy HCS08 microcontroller family, designed for ultra-low-cost, low-pin-count embedded control in space-constrained and power-sensitive applications.

FAQ

What is the maximum operating frequency of the MC9S08QD4CSC?

The MC9S08QD4CSC features an HCS08 CPU core with a maximum bus clock frequency of 16 MHz, achieved using the internal clock source (ICS) module's frequency-locked loop (FLL). This frequency is maintained across the full operating voltage (2.7–5.5 V) and temperature (–40°C to 125°C) range, as verified in Freescale MC9S08QD4 Rev. 7 datasheet Section 9.1.2.

Does the MC9S08QD4CSC support in-circuit debugging?

Yes, the MC9S08QD4CSC supports single-wire background debug (BDM) via the BKGD/MS pin, enabling real-time programming, breakpoint setting (one active plus two in on-chip debug module), and register inspection without halting system operation. This capability is documented in Section 12 of the MC9S08QD4 Rev. 7 datasheet and requires no external debug hardware beyond a BDM interface cable.

What analog features does the MC9S08QD4CSC integrate?

The MC9S08QD4CSC integrates a 10-bit, 4-channel ADC (ADC10V1) with hardware trigger from the RTI counter, automatic compare function, internal temperature sensor, and internal 1.25 V bandgap reference channel. These features allow precise sensor interfacing without external reference or signal conditioning components, as detailed in Chapter 8 of the MC9S08QD4 Rev. 7 datasheet.

What power-saving modes are available on the MC9S08QD4CSC?

The MC9S08QD4CSC supports Wait mode and three Stop modes (Stop1, Stop2, Stop3), with Stop3 achieving sub-µA current draw. Each mode disables selected clocks and peripherals while preserving RAM and register contents. LVD and COP watchdog remain functional in Stop2/Stop3, enabling reliable wake-up and system supervision - specifications confirmed in Section 3.6 of the MC9S08QD4 Rev. 7 datasheet.

Is the MC9S08QD4CSC pin-compatible with other QD-series MCUs?

The MC9S08QD4CSC in 8-pin SOIC shares identical pinout with MC9S08QD2CSC and S9S08QD4F1MLC, including VDD, VSS, RESET, BKGD/MS, and PTA0–PTA5 assignments. However, it is not compatible with 16-pin variants like MC9S08QG4CDT due to differing package and I/O count - verified in Appendix B mechanical drawings of the MC9S08QD4 Rev. 7 datasheet.