NXP Semiconductors MC9S08SH8MTJ

Overview

MC9S08SH8MTJ from Freescale Semiconductor is an 8-bit HCS08 microcontroller featuring a 40-MHz CPU, 8 KB on-chip FLASH memory, and 512 bytes RAM. It integrates ADC (12-channel, 10-bit), dual TPM modules, SCI, SPI, I²C, RTC, ACMP, and low-power stop3 mode operation. Designed for embedded control in cost-sensitive industrial and automotive subsystems, it supports real-time interrupt wake-up from stop3 using its internal 1-kHz oscillator.

For engineers reviewing the MC9S08SH8MTJ datasheet, MC9S08SH8MTJ pinout, MC9S08SH8MTJ application, or MC9S08SH8MTJ equivalent, key selection criteria include QFN-24 package compatibility, 20 MHz maximum bus frequency via ICS FLL, 2.5 µs ADC conversion time, and single-wire background debug interface support for in-circuit development.

Technical Context

The MC9S08SH8MTJ implements the HCS08 CPU core with HC08 instruction set extension (including BGND), supporting up to 32 interrupt/reset sources and full debugging via single-wire BDM. Its Internal Clock Source (ICS) uses a frequency-locked loop (FLL) with precision-trimmed internal reference (±2% over voltage/temperature) to generate bus frequencies from 2 MHz to 20 MHz.

Peripherals operate across power modes: ADC and ACMP remain functional in stop3 mode; RTC runs continuously using either external clock or internal 1-kHz low-power oscillator; SCI supports LIN master break generation and slave break detection; TPM modules provide edge- or center-aligned PWM with input capture and output compare.

Key Specifications

Pinout & Package

MC9S08SH8MTJ is housed in a 24-pin QFN package (98ASA00474D) with exposed thermal pad, copper-wire interconnect, and 0.4 mm pitch. The package supports automated optical inspection and provides enhanced thermal performance over legacy gold-wire variants.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MC9S08SH8MTJ, MC9S08AC16CFGE offers double memory and more I/O in a larger package, while S9KEAZ128AMLH delivers ARM-class processing in identical 24-QFN form factor-making it suitable for long-term design continuity where future feature expansion is anticipated.

Availability

MC9S08SH8MTJ is available at Aetrix Electronics and suitable for automotive body electronics, industrial sensor nodes, home appliance motor controllers, and portable medical diagnostics requiring stable component supply and long-lifecycle support.

Supply support for MC9S08SH8MTJ 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) is a fabless semiconductor company specializing in microcontrollers, analog, and connectivity solutions for automotive, industrial, and consumer markets.

The MC9S08SH8MTJ belongs to the HCS08 family-designed for cost-optimized, low-power embedded control applications where deterministic real-time response and debuggability are essential.

FAQ

What is the maximum bus frequency supported by the MC9S08SH8MTJ?

The MC9S08SH8MTJ supports a maximum bus frequency of 20 MHz, achieved through its Internal Clock Source (ICS) module's frequency-locked loop (FLL) operating with a precision-trimmed internal reference. This value is validated across the full industrial temperature range (−40°C to +105°C) and supply voltage (2.7–5.5 V). The MC9S08SH8MTJ achieves this without requiring an external crystal when using the internal reference, simplifying board design while maintaining timing accuracy.

Does the MC9S08SH8MTJ support LIN communication natively?

Yes, the MC9S08SH8MTJ's SCI module includes native LIN 2.0 support: it can generate extended-break fields as a LIN master and detect them as a LIN slave. This capability is implemented in hardware and requires no CPU overhead during break transmission or recognition. The MC9S08SH8MTJ uses the same SCI peripheral for both standard UART and LIN functions-enabling seamless integration into automotive body networks without additional protocol ICs.

Can the MC9S08SH8MTJ operate in ultra-low-power modes with analog peripherals active?

Yes, the MC9S08SH8MTJ supports Stop3 mode, where the ADC, ACMP, and RTC remain fully operational while the CPU and most clocks are halted. In this mode, current consumption drops below 1 µA (typical), and wake-up can occur via RTC overflow, ADC conversion completion, or comparator output transition. The MC9S08SH8MTJ maintains full analog functionality-including temperature sensor readings and bandgap-referenced comparisons-without external components.

What debug interface does the MC9S08SH8MTJ provide, and is external hardware required?

The MC9S08SH8MTJ features a single-wire background debug (BDM) interface accessible via the BKGD/MS pin, eliminating the need for dedicated JTAG headers or multi-pin debug connectors. A standard BDM pod (e.g., OSBDM or compatible) connects directly to this pin and VDD/VSS for full in-circuit debugging-including breakpoints, register inspection, and flash programming. No external debug silicon is required, and the MC9S08SH8MTJ's on-chip ICE module supports trace capture and forced breakpoints without host intervention.

Is the MC9S08SH8MTJ pin-compatible with other members of the HCS08 SH-series?

No-MC9S08SH8MTJ uses a 24-QFN package (98ASA00474D), while other SH-series devices like MC9S08SH16 or MC9S08SH32 are offered in 20-TSSOP, 20-SOIC, or 24-QFN variants with differing pinouts. Although electrical characteristics and peripheral sets overlap significantly, the MC9S08SH8MTJ's 24-QFN pin assignment is unique to its memory configuration and I/O count. Board designs must verify pin mapping per device variant; the MC9S08SH8MTJ cannot be substituted without layout verification.