NXP Semiconductors MC9S08QG8MDNE

Overview

MC9S08QG8MDNE from Freescale Semiconductor is an 8-bit HCS08 microcontroller with 8 KB FLASH, 512 bytes RAM, 20-MHz CPU, internal clock source (FLL), and integrated peripherals including 10-bit ADC, SCI, SPI, I²C, TPM, ACMP, and KBI. It operates from 2.7–5.5 V and targets cost-sensitive embedded control in automotive body electronics and industrial sensors.

For engineers reviewing the MC9S08QG8MDNE datasheet, MC9S08QG8MDNE pinout, MC9S08QG8MDNE application, or MC9S08QG8MDNE equivalent, key selection criteria include its 16-pin QFN package, single-wire background debug interface, on-chip COP watchdog with 1-kHz internal clock option, hardware-triggerable ADC, and support for Wait + three Stop power-saving modes.

Technical Context

The MC9S08QG8MDNE implements the S08CPUV2 core with HC08 instruction set plus BGND, supporting up to 32 interrupt/reset sources and featuring an on-chip debug module with two comparators, nine trigger modes, and eight-deep FIFO for flow tracing. Its ICS module integrates a frequency-locked loop (FLL) trimmed to ±0.2% resolution over voltage and temperature, enabling bus frequencies from 1 MHz to 10 MHz.

Peripherals are tightly coupled to the CPU via dedicated register maps: the 8-channel 10-bit ADC supports automatic compare and RTI-triggered conversions; the 2-channel TPM provides edge-aligned and center-aligned PWM; and the ACMP output can be routed directly to TPM for analog event-driven timing control.

Key Specifications

Pinout & Package

MC9S08QG8MDNE is housed in a 16-pin quad flat no-lead (QFN) package with exposed thermal pad (98ASA00671D), measuring 4 mm × 4 mm × 0.85 mm, RoHS-compliant, and optimized for low-inductance ground connection via soldered EPAD.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MC9S08QG8MDNE, MC9RS08KB12 offers lower cost and smaller footprint for non-analog applications, while S9KEAZ128AMLH provides significant headroom in processing, memory, and peripheral capability - making it suitable for next-generation designs where long-term scalability matters more than immediate pin compatibility.

Availability

MC9S08QG8MDNE is available at Aetrix Electronics and suitable for automotive body electronics, industrial sensor nodes, smart appliance interfaces, and LED lighting controllers requiring stable component supply across extended product lifecycles.

Supply support for MC9S08QG8MDNE 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 (now part of NXP Semiconductors since 2015) was a leading designer of embedded processors, analog, and mixed-signal ICs for automotive, industrial, and consumer markets.

The MC9S08QG8MDNE belongs to the HCS08 microcontroller family, engineered for cost-sensitive, low-power embedded control applications demanding high integration, robust debug capability, and automotive-grade reliability.

FAQ

What is the maximum operating frequency of the MC9S08QG8MDNE CPU?

The MC9S08QG8MDNE features a 20-MHz HCS08 CPU core. Its internal clock source (ICS) supports bus frequencies from 1 MHz to 10 MHz using the FLL, and external crystal oscillators up to 20 MHz. The CPU executes instructions at the bus frequency, so maximum effective throughput occurs at 10 MHz bus speed with optimized wait-state configuration. The MC9S08QG8MDNE does not operate at 20 MHz system clock - that value refers to the core's rated capability under ideal conditions, not sustained bus frequency.

Does the MC9S08QG8MDNE support in-circuit debugging, and what interface is used?

Yes, the MC9S08QG8MDNE supports full in-circuit debugging via a single-wire background debug interface using the BKGD/MS pin. This interface enables real-time bus capture, breakpoint setting (one active + two in debug module), and on-chip emulation without requiring additional pins or JTAG hardware. The MC9S08QG8MDNE debug module includes two comparators and nine trigger modes, allowing precise program flow analysis during development and validation.

What power-saving modes are available on the MC9S08QG8MDNE, and how do they differ?

The MC9S08QG8MDNE supports Wait mode and three Stop modes (Stop1, Stop2, Stop3). Wait halts the CPU while keeping clocks and peripherals active; Stop1 disables the ICS but retains RAM and registers; Stop2 disables the ICS and most clocks except RTI; Stop3 shuts down nearly all circuitry, drawing less than 1 µA while preserving RAM and selected wakeup sources. Each mode offers progressively deeper power reduction, with Stop3 being optimal for battery-powered applications where rapid wake-up is not required. The MC9S08QG8MDNE allows selective peripheral retention in all Stop modes via SPMSC control registers.

Can the MC9S08QG8MDNE ADC be triggered automatically without CPU involvement?

Yes, the MC9S08QG8MDNE ADC supports hardware triggering using the Real-Time Interrupt (RTI) counter output. When configured, the RTI overflow signal initiates a conversion sequence on the selected ADC channel - enabling precise, jitter-free periodic sampling independent of CPU scheduling. This capability is especially valuable in sensor monitoring applications where deterministic timing is critical. The MC9S08QG8MDNE also supports automatic compare functionality, allowing the ADC to generate an interrupt only when results exceed predefined thresholds.

Is the MC9S08QG8MDNE pin-compatible with other members of the QG series, such as the MC9S08QG4?

No, the MC9S08QG8MDNE is not fully pin-compatible with the MC9S08QG4 across all packages. While both share identical 16-pin QFN (MDNE) and 16-pin TSSOP footprints, the MC9S08QG4 lacks the XIN/XOUT oscillator pins in the 16-pin variants - those functions are omitted to accommodate different pin mappings. Therefore, direct substitution requires verification of oscillator implementation and signal routing. The MC9S08QG8MDNE uses all 16 pins in its QFN package, including dedicated crystal inputs, whereas the MC9S08QG4 16-pin version repurposes those pins for GPIO.