NXP Semiconductors MC9S08SH8MTJR

Overview

MC9S08SH8MTJR from Freescale Semiconductor is an 8-bit HCS08 microcontroller featuring a 40-MHz CPU, 8 KB on-chip FLASH memory, and 512 B RAM. It integrates ADC (12-channel, 10-bit), analog comparator, RTC, dual TPM modules, SCI, SPI, and I²C interfaces. Designed for embedded control in space-constrained industrial sensors and low-power metering systems.

For engineers reviewing the MC9S08SH8MTJR datasheet, MC9S08SH8MTJR pinout, MC9S08SH8MTJR application, or MC9S08SH8MTJR equivalent, key selection criteria include its 24-QFN package with exposed pad, internal clock source (ICS) supporting 2–20 MHz bus frequencies, stop3 mode operation with ADC/ACMP active, and single-wire background debug interface.

Technical Context

The MC9S08SH8MTJR implements the HCS08 CPU core with HC08 instruction set extension (including BGND), supporting up to 32 interrupt/reset sources. Its internal clock source (ICS) uses a frequency-locked loop (FLL) with precision-trimmed internal reference (±2% deviation over voltage/temperature) and selectable external crystal input (1–16 MHz or 31.25–38.4 kHz).

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

Key Specifications

Pinout & Package

The MC9S08SH8MTJR is housed in a 24-pin QFN package (98ASA00474D) with 4×4 mm body, 0.5 mm pitch, and exposed thermal pad. Pinout conforms to Freescale's standard 24-QFN mapping for SH-series MCUs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MC9S08SH8MTJR, MC9S08AW60CFUE offers greater memory and CAN but demands more board area and power; S9KEAZ128AMLH delivers modern architecture and peripherals but increases BOM cost and design complexity - making MC9S08SH8MTJR optimal for cost-sensitive, low-power, fixed-function embedded controllers.

Availability

MC9S08SH8MTJR is available at Aetrix Electronics and suitable for smart energy metering, industrial sensor nodes, automotive body control modules, and home appliance timer controllers requiring stable component supply and long-term lifecycle support.

Supply support for MC9S08SH8MTJR 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 global leader in embedded processing solutions, specializing in microcontrollers, analog, and connectivity products for automotive, industrial, and consumer markets.

The MC9S08SH8MTJR belongs to the HCS08 family - designed specifically for cost-optimized, low-power embedded control applications where small footprint, robust debug capability, and mixed-signal integration are critical.

FAQ

What is the maximum operating frequency of the MC9S08SH8MTJR?

The MC9S08SH8MTJR supports a maximum bus frequency of 20 MHz when using the internal clock source (ICS) with FLL enabled, or up to 40 MHz when driven by an external crystal oscillator. The HCS08 CPU executes instructions at two bus cycles per instruction, yielding effective throughput up to 20 MIPS. All timing specifications in the MC9S08SH8MTJR datasheet are validated across -40°C to 125°C and full VDD range.

Does the MC9S08SH8MTJR support in-circuit debugging without additional hardware?

Yes, the MC9S08SH8MTJR includes a single-wire background debug (BDM) interface accessible via the BKGD/MS pin, enabling full in-circuit debugging without dedicated JTAG headers. The on-chip ICE module provides two hardware breakpoints, event-triggered trace capture, and 8-deep FIFO storage - allowing developers to debug the MC9S08SH8MTJR directly on target hardware using standard Freescale-compatible debug probes.

Can the MC9S08SH8MTJR operate in ultra-low-power modes with analog peripherals active?

Yes, the MC9S08SH8MTJR supports Stop3 mode, where the ADC, analog comparator, RTC, and SCI remain fully operational while the CPU and most clocks are halted. In this mode, the MC9S08SH8MTJR draws less than 2 µA typical current, enabling battery-powered applications like wireless sensors to achieve multi-year operation. Wake-up can be triggered by ADC completion, comparator output, RTC overflow, or SCI start bit detection.

What package type and thermal characteristics does the MC9S08SH8MTJR use?

The MC9S08SH8MTJR is packaged in a 24-pin QFN (98ASA00474D) with 4×4 mm body, 0.5 mm pitch, and exposed thermal pad. This copper-wire QFN variant replaces earlier gold-wire versions and improves thermal resistance (θ_JA ≈ 52°C/W on 2-layer board). The exposed pad must be soldered to a solid ground plane for optimal thermal performance and EMI suppression in the MC9S08SH8MTJR design.

Is there an integrated temperature sensor in the MC9S08SH8MTJR, and how is it accessed?

Yes, the MC9S08SH8MTJR includes a factory-calibrated on-die temperature sensor connected to ADC channel 14. It requires no external components and delivers ±3°C accuracy across -40°C to 125°C. To read temperature, configure the ADC for single-ended mode on channel 14, enable the temperature sensor bias, and convert using internal bandgap reference - results are accessible via the MC9S08SH8MTJR's ADC result register (ADR1) after conversion completes.