NXP Semiconductors MC9S08SH8MWJR

Overview

MC9S08SH8MWJR from NXP Semiconductors (formerly Freescale) 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 low-power stop/wait modes. Designed for cost-sensitive industrial control and sensor interface applications requiring embedded real-time operation.

For engineers reviewing the MC9S08SH8MWJR datasheet, MC9S08SH8MWJR pinout, MC9S08SH8MWJR application, or MC9S08SH8MWJR equivalent, key selection criteria include its 24-QFN package, internal clock source (ICS) with FLL supporting 2–20 MHz bus frequency, 17 GPIOs + 1 output-only pin, and support for Stop3 mode with ADC/ACMP/RTC active - critical for battery-powered sensing nodes.

Technical Context

The MC9S08SH8MWJR implements the HCS08 CPU core with HC08 instruction set plus BGND, supporting up to 32 interrupt/reset sources. Its Internal Clock Source (ICS) uses a frequency-locked loop (FLL) trimmed for ±2% deviation over voltage and 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 using the on-chip 1-kHz low-power oscillator; RTC runs continuously via external clock or internal 1-kHz oscillator; SCI supports LIN master/slave extended break handling and wake-up on active edge.

Key Specifications

Pinout & Package

MC9S08SH8MWJR is housed in a 24-pin QFN package (case outline 98ASA00474D) with 4 mm × 4 mm body, 0.5 mm lead pitch, and thermally enhanced exposed pad. The package supports copper-wire bonding per Freescale QFN migration addendum Rev. 0 (2014).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MC9S08SH8MWJR, MC9S08AC16CFGE offers expanded memory and I/O in a physically larger package, while S9KEAZ128AMLH delivers ARM-based performance and peripherals at the cost of architectural discontinuity and increased design effort.

Availability

MC9S08SH8MWJR is available at Aetrix Electronics and suitable for industrial sensor nodes, smart HVAC actuators, programmable power monitors, and embedded LIN slave nodes requiring stable component supply and long-term manufacturability.

Supply support for MC9S08SH8MWJR 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 focused on secure connectivity solutions for automotive, industrial, and IoT applications, with deep heritage in microcontrollers from its acquisition of Freescale.

The MC9S08SH8MWJR belongs to the legacy HCS08 MCU family, designed specifically for cost-optimized, low-power embedded control in industrial automation, building systems, and appliance applications where deterministic 8-bit performance suffices.

FAQ

What is the maximum operating frequency of the MC9S08SH8MWJR CPU core?

The MC9S08SH8MWJR features an HCS08 CPU core rated for up to 40 MHz operation. This corresponds to a 25 ns instruction cycle time under optimal conditions, enabling deterministic real-time response for time-critical control loops. The actual bus frequency is governed by the Internal Clock Source (ICS) configuration, which supports 2–20 MHz using its FLL - the 40-MHz core speed is achieved via internal prescaling and pipeline optimization, not direct bus clocking.

Does the MC9S08SH8MWJR support debugging without dedicated JTAG pins?

Yes, the MC9S08SH8MWJR implements a single-wire background debug interface on the BKGD/MS pin, allowing full in-circuit debugging, flash programming, and breakpoint setting using only that one signal. This eliminates the need for a 6-pin JTAG header, conserving PCB space and I/O resources - a key advantage for compact industrial modules where board area is constrained.

Can the MC9S08SH8MWJR operate in ultra-low-power modes with analog peripherals active?

Yes, the MC9S08SH8MWJR supports Stop3 mode, where the 1-kHz internal low-power oscillator remains active and powers the RTC, ADC, and ACMP modules. This enables periodic wake-up for sensor sampling or threshold monitoring without external clock sources - verified in the datasheet Addendum Rev. 1 (2012), which confirms ADC and ACMP functionality in Stop3 with 700 µs minimum internal oscillator period at 5 V and −40°C to 125°C.

What package type and dimensions does the MC9S08SH8MWJR use?

The MC9S08SH8MWJR is packaged in a 24-pin QFN (quad flat no-lead) with 4 mm × 4 mm body size, 0.5 mm lead pitch, and an exposed thermal pad. Its case outline number is 98ASA00474D, reflecting Freescale's copper-wire bonding migration per QFN Addendum Rev. 0 (2014). This package provides superior thermal dissipation and compact footprint versus older SOIC or PDIP alternatives.

Is the MC9S08SH8MWJR compatible with LIN 2.x physical layer timing requirements?

Yes, the MC9S08SH8MWJR's SCI module supports LIN master extended break generation and LIN slave extended break detection per ISO 17987-4, enabling compliance with LIN 2.x timing specifications. Its internal baud rate generator and flexible clock sourcing allow precise break field duration control - confirmed in the MC9S08SH8 Datasheet Rev. 3 (2008), Section 14, and validated in application note AN3782.