NXP Semiconductors MC9S08SH32MTJR

Overview

MC9S08SH32MTJR from NXP (formerly Freescale) is an 8-bit HCS08 microcontroller with 32 KB on-chip FLASH, 2 KB RAM, and a 40-MHz CPU core. It integrates ADC (10-bit, 16-channel), dual TPM PWM modules, SCI/SPI/IIC interfaces, RTC, and analog comparators - deployed in industrial sensor nodes and motor control subsystems requiring deterministic real-time response.

For engineers reviewing the MC9S08SH32MTJR datasheet, MC9S08SH32MTJR pinout, MC9S08SH32MTJR application, or MC9S08SH32MTJR equivalent, key selection criteria include stop3-mode power consumption (1.5 µA), internal clock source accuracy (±2% over voltage/temperature), 23 GPIOs with configurable slew rate, and single-wire background debug support for space-constrained embedded designs.

Technical Context

The MC9S08SH32MTJR implements the S08CPUV3 core with HC08 instruction set plus BGND, supporting up to 32 interrupt/reset sources. Its ICS module uses a frequency-locked loop (FLL) with precision-trimmed internal reference (0.2% resolution) to generate bus frequencies from 2 MHz to 20 MHz.

Peripherals operate across all power modes: ADC and ACMP remain functional in stop3 mode; RTC runs continuously on a free-running 1-kHz on-chip oscillator; SCI supports LIN master break generation and wake-up on active edge - enabling low-power communication in automotive body electronics.

Key Specifications

Pinout & Package

MC9S08SH32MTJR is housed in a 28-pin TSSOP package (JEDEC MO-153AA), 9.7 mm × 4.4 mm × 1.2 mm, lead pitch 0.65 mm, RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MC9S08SH16MTJR, the MC9S08SH32MTJR offers double FLASH and RAM for complex control algorithms; versus S9KEAZ128AMLH, it retains legacy toolchain compatibility and lower power in stop3 mode but lacks ARM ecosystem advantages.

Availability

MC9S08SH32MTJR is available at Aetrix Electronics and suitable for industrial sensor nodes, automotive body control modules, small-appliance motor controllers, and smart HVAC actuators requiring stable component supply across multi-year production cycles.

Supply support for MC9S08SH32MTJR 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 markets, with roots in Freescale's microcontroller heritage.

The MC9S08SH32MTJR belongs to the HCS08 family - designed for cost-sensitive, ultra-low-power embedded control applications where deterministic real-time response, minimal external components, and long-term supply stability are critical.

FAQ

What is the maximum operating frequency of the MC9S08SH32MTJR CPU core?

The MC9S08SH32MTJR features an HCS08 CPU core rated for up to 40 MHz operation. This corresponds to a 25 ns instruction cycle time, enabling deterministic execution of time-critical control tasks such as motor commutation and sensor sampling. The actual bus frequency is derived from the internal clock source (ICS) or external crystal and is configurable from 2 MHz to 20 MHz per the ICS module specification. MC9S08SH32MTJR achieves this performance while maintaining compatibility with legacy HC08 software tools.

Does the MC9S08SH32MTJR support in-circuit debugging, and what interface is used?

Yes, the MC9S08SH32MTJR supports in-circuit debugging via a single-wire background debug mode (BDM) interface using the BKGD/MS pin. This interface enables full-speed execution control, breakpoint setting (one hardware breakpoint plus two more in the on-chip debug module), and memory inspection without halting system clocks. MC9S08SH32MTJR does not require a dedicated JTAG header, reducing PCB footprint and BOM cost compared to multi-pin debug solutions.

What power-saving modes are available on the MC9S08SH32MTJR, and which peripherals remain active in stop3 mode?

The MC9S08SH32MTJR supports two very low-power stop modes (stop2 and stop3), plus reduced-power wait mode. In stop3 mode - drawing just 1.5 µA typical - the real-time counter (RTC) continues running on its dedicated 1-kHz internal oscillator, and both the ADC and analog comparators (ACMP) remain fully operational. MC9S08SH32MTJR also retains RAM contents and security state, allowing rapid wake-up with preserved context for battery-powered applications.

Can the MC9S08SH32MTJR operate without an external crystal, and what clock accuracy is achievable?

Yes, the MC9S08SH32MTJR can operate entirely from its internal clock source (ICS) module, which uses a frequency-locked loop (FLL) with a precision-trimmed internal reference. This delivers ±2% frequency deviation over full temperature and voltage ranges, and ±1.5% with internal temperature compensation enabled. MC9S08SH32MTJR thus eliminates the need for external crystals in cost-sensitive or space-constrained designs while maintaining sufficient accuracy for UART communication and RTC scheduling.

What analog features are integrated into the MC9S08SH32MTJR, and how are they utilized in sensor applications?

The MC9S08SH32MTJR integrates a 16-channel, 10-bit ADC with 2.5 µs conversion time, an on-die temperature sensor, internal bandgap reference, and two analog comparators (ACMP) with interrupt capability and routing to TPM modules. These features allow direct interfacing with thermistors, potentiometers, current-sense resistors, and voltage dividers. MC9S08SH32MTJR's ADC automatic compare function and ACMP edge-triggered interrupts enable responsive threshold detection - essential for overtemperature shutdown, end-stop sensing, and battery voltage monitoring without CPU intervention.