NXP Semiconductors MC9S08QE128CLD

Overview

MC9S08QE128CLD from NXP Semiconductors (formerly Freescale) is an 8-bit HCS08 microcontroller with 128 KB flash, 8 KB RAM, 70 GPIOs, 24-channel 12-bit ADC, dual analog comparators, and triple timer/PWM modules - designed for automotive body control, industrial sensor nodes, and low-power embedded systems operating from 1.8 V to 3.6 V.

For engineers reviewing the MC9S08QE128CLD datasheet, MC9S08QE128CLD pinout, MC9S08QE128CLD application, or MC9S08QE128CLD equivalent, key selection criteria include its 50.33-MHz CPU capability above 2.4 V, stop-mode wake-up in 6 μs, integrated real-time counter with 1-kHz low-power oscillator, and support for LIN, I²C, SPI, and SCI interfaces in a 48-pin QFN package.

Technical Context

The MC9S08QE128CLD implements the HCS08 CPU core with HC08 instruction set plus BGND, supporting up to 32 interrupt/reset sources and configurable power modes including stop3 with peripheral clock gating. Its internal clock source (ICS) uses FLL with factory-trimmed internal reference (±2% deviation, 0.2% resolution) to generate CPU frequencies from 2 MHz to 50.33 MHz.

It integrates two SCIs with LIN master/slave extended break handling, two I²C modules (100 kbps, multi-master), two SPIs (full-duplex or single-wire), six TPM channels across three modules, and a dedicated RTC with external clock input and free-running 1-kHz on-chip oscillator - all operable in stop3 mode with full voltage range support (1.8–3.6 V).

Key Specifications

Pinout & Package

MC9S08QE128CLD is housed in a 48-pin QFN package (Case 1314) with 0.5 mm pitch, 7 mm × 7 mm body, and exposed thermal pad. Pin assignments follow Freescale's standardized 48-pin QFN layout per Figure 4 of Rev. 7 datasheet.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MC9S08AC128CFUE, MC9S08QE128CLD adds RTC, dual I²C, and dual SCI for LIN-ready automotive use; versus S9KEAZ128AMLH, it offers lower-voltage operation (1.8 V vs. 2.7 V) and proven qualification for harsh environments, at the cost of ARM ecosystem advantages.

Availability

MC9S08QE128CLD is available at Aetrix Electronics and suitable for automotive body electronics, industrial sensor nodes, smart appliance control, and portable medical diagnostics requiring stable component supply across extended temperature ranges (–40°C to +85°C).

Supply support for MC9S08QE128CLD 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 leader delivering secure, scalable solutions for automotive, industrial, IoT, and mobile applications, with deep heritage in microcontroller innovation.

The MC9S08QE128CLD belongs to the HCS08-based QE series - engineered for energy-efficient, cost-optimized embedded control in automotive and industrial environments demanding robust analog integration and low-power operation.

FAQ

What is the maximum CPU frequency supported by the MC9S08QE128CLD across its operating voltage range?

The MC9S08QE128CLD supports up to 50.33 MHz CPU frequency when VDD is ≥2.4 V, 40 MHz at ≥2.1 V, and 20 MHz at ≥1.8 V - all across the full –40°C to +85°C temperature range. This voltage-scaled performance is enabled by the internal clock source (ICS) with FLL and factory-trimmed reference, ensuring stable timing without external crystal dependency.

Does the MC9S08QE128CLD support LIN communication, and how is it implemented?

Yes, the MC9S08QE128CLD supports LIN communication through its two SCI modules, each featuring LIN master extended break generation and LIN slave extended break detection. The SCI hardware handles break field timing and synchronization autonomously, reducing CPU overhead. The MC9S08QE128CLD also provides wake-up on active edge, enabling low-power LIN node operation compliant with LIN 2.x specifications.

Can the MC9S08QE128CLD operate in stop mode while maintaining ADC and RTC functionality?

Yes, the MC9S08QE128CLD supports full ADC and RTC operation in stop3 mode. The ADC retains 24-channel 12-bit resolution and 2.5 μs conversion time down to 1.8 V; the RTC continues running using either the internal 1-kHz low-power oscillator or an external clock source. This enables battery-backed data logging and periodic wake-up without external timing components.

What debug interface does the MC9S08QE128CLD provide, and what capabilities does it offer?

The MC9S08QE128CLD features a single-wire background debug (BDC) interface compatible with standard Freescale/NXP BDM tools. It supports breakpoint setting (one active + two additional), on-chip in-circuit emulator (ICE) with two comparators and nine trigger modes, and an eight-deep FIFO for storing flow-change addresses. Debug operations function across all power modes, including stop3, enabling full visibility during ultra-low-power operation.

How is flash memory protected against unauthorized access on the MC9S08QE128CLD?

The MC9S08QE128CLD implements flash block protection and security circuitry that prevents unauthorized read/write access to both flash and RAM contents. When security is enabled, the background debug interface is disabled, and flash read attempts return invalid data. Protection is configured via dedicated flash configuration fields and persists across power cycles, meeting requirements for firmware intellectual property protection in automotive and industrial deployments.