NXP Semiconductors MC9S08QG8CFQE

Overview

MC9S08QG8CFQE from Freescale Semiconductor is an 8-bit HCS08 microcontroller featuring a 20-MHz CPU, 8 KB Flash, 512 bytes RAM, and integrated peripherals including 10-bit ADC, SCI, SPI, I²C, TPM, ACMP, and MTIM. It operates in industrial temperature range (–40°C to +105°C) and supports multiple low-power stop modes. It is used in cost-sensitive embedded control applications such as appliance motor control and sensor interface modules.

For engineers reviewing the MC9S08QG8CFQE datasheet, MC9S08QG8CFQE pinout, MC9S08QG8CFQE application, or MC9S08QG8CFQE equivalent, key selection considerations include its 16-pin QFN package with exposed pad, single-wire background debug interface, internal clock source with FLL and ±2% accuracy over voltage/temperature, and hardware-triggerable ADC with temperature sensor channel.

Technical Context

The MC9S08QG8CFQE implements the HCS08 CPU core with HC08 instruction set extension and BGND instruction for on-chip debugging. Its debug module includes two comparators, nine trigger modes, and an eight-deep FIFO for change-of-flow address capture during real-time emulation.

System clocking is managed by dual sources: the Internal Clock Source (ICS) with frequency-locked loop (FLL) and precision-trimmed internal reference (0.2% resolution), and the external oscillator (XOSC) supporting crystals/resonators from 31.25 kHz to 16 MHz. The COP watchdog can run from either bus clock or dedicated 1-kHz internal source.

Key Specifications

Pinout & Package

MC9S08QG8CFQE is housed in a 16-pin QFN package (case outline 98ASA00671D), 4 mm × 4 mm body, 0.5 mm lead pitch, with exposed thermal pad (EPAD) connected to VSS for improved thermal performance and EMI reduction.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MC9S08QG8CFQE, MC9S08QG8CDTE offers easier assembly at the cost of higher thermal resistance, while S9S08QG8J2CTJR provides identical performance and form factor with updated long-term sourcing assurance.

Availability

MC9S08QG8CFQE is available at Aetrix Electronics and suitable for appliance motor control, industrial sensor nodes, smart power outlets, and consumer electronics remote controls requiring stable component supply and industrial temperature operation.

Supply support for MC9S08QG8CFQE 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

Freescale Semiconductor was a U.S.-based semiconductor company specializing in embedded processors, analog, and connectivity solutions before its acquisition by NXP Semiconductors in 2015.

The MC9S08QG8CFQE belongs to the HCS08 microcontroller family, designed for cost-sensitive, low-power 8-bit control applications in appliances, industrial equipment, and consumer devices where small footprint and integrated analog peripherals are critical.

FAQ

What is the operating temperature range for the MC9S08QG8CFQE?

The MC9S08QG8CFQE is rated for industrial temperature operation from –40°C to +105°C. This specification is validated per Freescale's DC Characteristics table in Appendix A of the Rev. 5 datasheet and applies to all electrical parameters including Flash endurance, ADC accuracy, and I/O drive strength. The 16-pin QFN package's exposed pad enhances thermal dissipation to maintain reliability at maximum ambient temperature.

Does the MC9S08QG8CFQE support in-circuit debugging?

Yes, the MC9S08QG8CFQE supports single-wire background debugging via the BKGD/MS pin. Its on-chip debug module includes two hardware comparators, nine trigger modes, and an eight-deep FIFO for storing change-of-flow addresses. The MC9S08QG8CFQE also supports breakpoint setting during active debugging and integrates with Freescale's DEMO9S08QG8 evaluation board for real-time bus capture and firmware validation.

What clock sources does the MC9S08QG8CFQE support?

The MC9S08QG8CFQE supports two primary clock sources: the Internal Clock Source (ICS) with frequency-locked loop (FLL) and factory-trimmed internal reference (±2% accuracy over voltage and temperature), and the external oscillator (XOSC) module accepting crystals or resonators from 31.25 kHz to 16 MHz. An external clock signal up to 20 MHz may also be applied directly to EXTAL, bypassing the crystal driver circuitry.

Can the MC9S08QG8CFQE's ADC operate without CPU intervention?

Yes, the MC9S08QG8CFQE's 10-bit ADC supports hardware triggering via the Real-Time Interrupt (RTI) counter. When configured, the RTI overflow event initiates a conversion automatically, allowing periodic sampling (e.g., temperature monitoring) without CPU polling or interrupt servicing. This feature is documented in Section 9.4.3 of the Rev. 5 datasheet and preserves CPU bandwidth for time-critical tasks.

Is the MC9S08QG8CFQE pin-compatible with other QG-series MCUs?

The MC9S08QG8CFQE shares the same 16-pin QFN footprint (98ASA00671D) and pin assignment with MC9S08QG4CFQE, but not with 24-pin or 32-pin QG variants. Pin functions are consistent across the 16-pin QG family, enabling shared PCB layout for different memory configurations. However, firmware must be verified for Flash/RAM size differences and peripheral enablement settings specific to each part number.