NXP Semiconductors MC9S08SH8MWJ

Overview

MC9S08SH8MWJ from Freescale Semiconductor is an 8-bit HCS08 microcontroller with 8 KB Flash, 512 B RAM, and a 40-MHz CPU core. It integrates ADC (12-channel, 10-bit), ACMP, SCI, SPI, I²C, two TPM modules, RTC, and supports stop3 mode for ultra-low-power operation. Designed for embedded control in automotive body electronics and industrial sensors.

For engineers reviewing the MC9S08SH8MWJ datasheet, MC9S08SH8MWJ pinout, MC9S08SH8MWJ application, or MC9S08SH8MWJ equivalent, key selection criteria include its 24-QFN package, internal clock source with FLL (2–20 MHz bus frequency), 17 GPIOs + 1 output-only pin, real-time interrupt capability in all power modes, and single-wire background debug interface.

Technical Context

The MC9S08SH8MWJ implements the HCS08 CPU core with HC08 instruction set plus BGND, supporting up to 32 interrupt/reset sources. Its Internal Clock Source (ICS) module uses a frequency-locked loop (FLL) with precision-trimmed internal reference (0.2% resolution, ±2% deviation over voltage/temperature), enabling stable bus frequencies from 2 MHz to 20 MHz without external crystal.

Peripherals operate across power modes: ADC and ACMP remain functional in stop3 mode; RTC runs on free-running 1-kHz low-power oscillator; SCI supports LIN master/slave extended break; TPM modules offer edge- or center-aligned PWM with input capture and output compare. All I/O pins support configurable pull-up, slew rate, and drive strength.

Key Specifications

Pinout & Package

MC9S08SH8MWJ is housed in a 24-pin QFN package (case outline 98ASA00474D), measuring 4 mm × 4 mm with 0.5 mm pitch and an exposed thermal pad. The package uses copper wire bonding per Freescale's QFN migration addendum (Rev. 0, 07/2014).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MC9S08SH8MWJ, MC9S08AW60CFGE offers expanded memory and I/O in a larger package for feature-rich implementations, while S9KEAZ128AMLH provides ARM-based scalability at the cost of architectural discontinuity and loss of LIN-specific hardware acceleration.

Availability

MC9S08SH8MWJ is available at Aetrix Electronics and suitable for automotive body electronics, industrial sensor nodes, smart lighting controllers, and appliance motor interfaces requiring stable component supply and long lifecycle support.

Supply support for MC9S08SH8MWJ 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 connectivity solutions for automotive, industrial, and consumer markets.

The MC9S08SH8MWJ belongs to the HCS08 microcontroller family, engineered for cost-sensitive, low-power embedded control applications where reliability, small footprint, and integrated analog peripherals are critical.

FAQ

What is the maximum operating frequency of the MC9S08SH8MWJ CPU core?

The MC9S08SH8MWJ CPU core operates at a maximum frequency of 40 MHz. This speed is achievable when the Internal Clock Source (ICS) module configures the bus frequency up to 20 MHz and the core executes instructions at double the bus clock rate. The actual sustained frequency depends on supply voltage (2.7–5.5 V) and temperature (−40°C to 125°C), with electrical characteristics validated across this full range per the Rev. 3 datasheet.

Does the MC9S08SH8MWJ support LIN communication natively?

Yes, the MC9S08SH8MWJ supports LIN communication natively through its SCI module, which includes hardware features for both LIN master and slave operation. Specifically, it provides LIN master extended break generation and LIN slave extended break detection, enabling compliant node implementation without external transceivers or software bit-banging. The MC9S08SH8MWJ also supports wake-up on active edge, essential for low-power LIN network participation.

What power-saving modes does the MC9S08SH8MWJ offer, and which peripherals remain active in stop3 mode?

The MC9S08SH8MWJ offers Run, Wait, Stop2, and Stop3 modes. In Stop3 mode - its deepest low-power state - current consumption drops below 1 µA typical while retaining RTC operation on the dedicated 1-kHz internal oscillator. Additionally, the ADC and ACMP modules remain functional and can trigger wake-up events, enabling sensor polling without full MCU restart. The MC9S08SH8MWJ maintains register contents and I/O states across Stop3 entry/exit.

Is the MC9S08SH8MWJ pin-compatible with other members of the MC9S08SHx family?

No, the MC9S08SH8MWJ is not universally pin-compatible across the MC9S08SHx family. While it shares the 24-QFN package with MC9S08SH4, differences in peripheral mapping and pin function allocation exist - for example, PTD pins on MC9S08SH8MWJ support ACMP inputs not present on lower-pin-count variants. Always verify pin assignments against the specific device's "Pins and Connections" chapter in the MC9S08SH8 datasheet before assuming compatibility.

What debug interface does the MC9S08SH8MWJ use, and what capabilities does it provide?

The MC9S08SH8MWJ uses a single-wire background debug (BDM) interface via the BKGD/MS pin. This interface supports non-intrusive in-circuit debugging, including breakpoint setting, memory/register inspection, and flash programming. The on-chip debug module adds two hardware comparators, nine trigger modes, and an eight-deep FIFO for change-of-flow tracing. The MC9S08SH8MWJ also supports the BGND instruction for software-initiated debug entry without external hardware.