NXP Semiconductors MC9S08SH8CTJ

Overview

MC9S08SH8CTJ 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), dual TPM modules, SCI, SPI, I²C, RTC, ACMP, and supports stop3 mode with real-time interrupt wake-up. Designed for cost-sensitive industrial control and sensor interface applications requiring low-power operation and single-wire debug.

For engineers reviewing the MC9S08SH8CTJ datasheet, MC9S08SH8CTJ pinout, MC9S08SH8CTJ application, or MC9S08SH8CTJ equivalent, key selection criteria include its 24-QFN package, internal clock source (ICS) with FLL supporting 2–20 MHz bus frequency, 17 GPIOs with configurable slew rate and pull-ups, and full peripheral operation in stop3 mode - critical for battery-powered embedded systems.

Technical Context

The MC9S08SH8CTJ implements the HCS08 CPU core with HC08 instruction set extension (including BGND), supporting up to 32 interrupt/reset sources and single-wire background debug. Its ICS module uses a frequency-locked loop (FLL) with precision-trimmed internal reference (0.2% resolution, ±2% deviation over voltage/temperature) to generate stable system clocks from internal or external sources.

Peripherals operate across all power modes: ADC and ACMP remain functional in stop3 mode using the on-chip 1-kHz low-power oscillator; RTC runs free-running on the same oscillator; SCI supports LIN-compliant break generation/detection; and TPM modules support edge- or center-aligned PWM with input capture and output compare.

Key Specifications

Pinout & Package

MC9S08SH8CTJ is housed in a 24-pin QFN package (case outline 98ASA00474D) with 4 × 4 mm footprint, 0.5 mm lead pitch, and exposed thermal pad for enhanced thermal performance. Pin numbering follows standard QFN convention (pin 1 marked by dot or notch).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MC9S08SH8CTJ, MC9S08AC16CFGE offers double the memory in identical packaging and pinout for seamless firmware scaling, while S9KEAZ128AMLH provides ARM-based performance and peripherals at the cost of architectural discontinuity and PCB redesign.

Availability

MC9S08SH8CTJ is available at Aetrix Electronics and suitable for industrial sensor nodes, automotive body electronics, smart appliance subsystems, and portable medical diagnostics requiring stable component supply and long-term manufacturability.

Supply support for MC9S08SH8CTJ 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 RF solutions for automotive, industrial, and consumer markets.

The MC9S08SH8CTJ belongs to the HCS08 family - designed for cost-optimized, low-power embedded control in resource-constrained environments where reliability, debug simplicity, and analog integration are critical.

FAQ

What is the maximum operating frequency of the MC9S08SH8CTJ CPU core?

The MC9S08SH8CTJ CPU core operates at up to 40 MHz. This maximum frequency is achieved when the internal clock source (ICS) is configured with the frequency-locked loop (FLL) and driven by an appropriate reference clock - either internal trimmed RC or external crystal/resonator. The actual bus frequency is programmable between 2 MHz and 20 MHz, with the CPU core running at the bus clock frequency multiplied by an internal divider.

Does the MC9S08SH8CTJ support debugging without additional hardware?

Yes, the MC9S08SH8CTJ supports single-wire background debug (BDM) using only the BKGD/MS pin and ground. No external debugger probe is required for basic in-circuit programming and breakpoint debugging. The on-chip debug module includes two hardware comparators and supports tag/force breakpoints, making it possible to perform full firmware development and validation with minimal external connections.

Can the MC9S08SH8CTJ ADC operate while the MCU is in stop3 mode?

Yes, the MC9S08SH8CTJ ADC remains fully operational in stop3 mode. It can perform conversions using the internal bandgap reference and supports automatic compare functions and temperature sensor readings without waking the CPU. This capability allows continuous sensor monitoring at ultra-low power - critical for battery-powered applications where average current must remain below 10 µA.

What is the purpose of the ganged output feature on PTB[5:2] and PTC[3:0] of the MC9S08SH8CTJ?

The ganged output feature on PTB[5:2] and PTC[3:0] allows a single write to the port data register to simultaneously update multiple output pins. This eliminates timing skew between pins and ensures atomic state transitions - essential for driving multi-segment displays, stepper motor phases, or synchronized LED banks where correlated timing is required and software-controlled bit-banging would introduce jitter.

Is the MC9S08SH8CTJ qualified for automotive applications?

The MC9S08SH8CTJ is specified for operation from -40°C to +125°C and features automotive-grade peripherals including LIN-compliant SCI, robust ESD protection, and watchdog timer with independent 1-kHz clock source. While not AEC-Q100 certified as a standalone part, it has been widely deployed in automotive body electronics (e.g., door modules, lighting controls) where system-level qualification meets functional safety requirements.