NXP Semiconductors MC9S08SH4CTJ

Overview

MC9S08SH4CTJ from Freescale Semiconductor is an 8-bit HCS08 microcontroller featuring a 40-MHz CPU, 4 KB flash memory, and integrated peripherals including 10-bit ADC, analog comparator, SCI, SPI, I²C, TPM PWM timers, and RTC. It operates across -40°C to 105°C with internal clock source (ICS) supporting 2–20 MHz bus frequencies and runs in low-power stop3 mode with real-time interrupt capability. Used in industrial sensor nodes and embedded control modules requiring compact footprint and deterministic timing.

For engineers reviewing the MC9S08SH4CTJ datasheet, MC9S08SH4CTJ pinout, MC9S08SH4CTJ application, or MC9S08SH4CTJ equivalent, this page delivers verified package mapping (24-QFN), confirmed peripheral capabilities (ADC, ACMP, SCI, SPI, I²C, TPM, RTC), power modes (stop3/wait/run), clock architecture (ICS+FLL), and validated alternative options for cost- or feature-sensitive design trade-offs.

Technical Context

The MC9S08SH4CTJ 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) with precision-trimmed internal reference (0.2% resolution, ±2% deviation over voltage/temperature), enabling stable bus frequencies from 2 MHz to 20 MHz without external crystal.

Peripherals include a 12-channel 10-bit ADC with 2.5 µs conversion time and temperature sensor, dual 2-channel TPM modules supporting input capture/output compare/PWM, full-duplex SCI with LIN break generation/detection, and I²C interface operating up to 100 kbps. All key analog and digital peripherals remain functional in stop3 mode.

Key Specifications

Pinout & Package

MC9S08SH4CTJ is housed in a 24-pin QFN package (98ASA00474D) with exposed thermal pad, copper-wire bonding, and 0.5 mm pitch. The package supports reflow soldering per JEDEC J-STD-020 and requires PCB land pattern matching Freescale's 98ASA00474D mechanical drawing.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MC9S08SH4CTJ, MC9S08SH8CTJ offers double flash/RAM in identical packaging for seamless firmware scaling, while S9KEAZ128AMLH provides architectural upgrade path at cost of complete hardware redesign and toolchain migration.

Availability

MC9S08SH4CTJ is available at Aetrix Electronics and suitable for industrial sensor nodes, automotive body control modules, smart appliance subsystems, and medical diagnostic handhelds requiring stable component supply, long-term lifecycle support, and qualified QFN packaging.

Supply support for MC9S08SH4CTJ 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 since 2015) was a leading designer of embedded processors, analog, and connectivity solutions for automotive, industrial, and consumer markets.

The MC9S08SHx series targets cost-sensitive, space-constrained embedded control applications demanding low power, rich analog integration, and robust debug support - optimized for sensor interfaces, motor control, and LIN-connected modules.

FAQ

What is the maximum bus frequency supported by the MC9S08SH4CTJ?

The MC9S08SH4CTJ supports a maximum bus frequency of 20 MHz when using the internal clock source (ICS) with frequency-locked loop (FLL). This is achieved with proper trimming of the internal reference oscillator and appropriate external crystal or resonator selection. The HCS08 CPU core itself operates at up to 40 MHz, with bus frequency being half the core clock in standard configuration. Actual achievable bus speed depends on VDD, temperature, and clock source configuration as specified in the electrical characteristics table of the MC9S08SH4CTJ datasheet.

Does the MC9S08SH4CTJ support in-circuit debugging, and what interface is used?

Yes, the MC9S08SH4CTJ supports in-circuit debugging via a single-wire background debug interface (BDM) using the BKGD/MS pin. This interface enables full read/write memory access, breakpoint setting (one hardware breakpoint plus two more via on-chip debug module), and real-time register inspection without halting system operation. The MC9S08SH4CTJ does not require JTAG or SWD; its BDM implementation is compatible with standard Freescale/NXP BDM debug probes and IDEs like S32DS or legacy CodeWarrior.

Can the MC9S08SH4CTJ operate in low-power modes while retaining RTC functionality?

Yes, the MC9S08SH4CTJ retains RTC functionality in all operating modes, including stop3 - its lowest-power mode. The RTC runs continuously on a dedicated 1-kHz internal low-power oscillator, enabling precise wake-up intervals (e.g., every 1 ms, 10 ms, or 1 s) without external components. This allows battery-powered applications to remain in stop3 for extended periods while maintaining accurate timekeeping and scheduled event triggering, a key capability confirmed in the MC9S08SH4CTJ datasheet section "On-Chip Peripheral Modules in Stop Modes".

What analog peripherals are integrated into the MC9S08SH4CTJ?

The MC9S08SH4CTJ integrates a 12-channel, 10-bit analog-to-digital converter (ADC) with 2.5 µs conversion time, internal bandgap reference, and dedicated temperature sensor channel. It also includes an analog comparator (ACMP) with selectable interrupt on rising/falling/both edges, option to compare against internal bandgap voltage, and output routable to TPM for hardware-synchronized actions. Both peripherals remain fully operational in stop3 mode, enabling always-on sensing in ultra-low-power applications.

Is the MC9S08SH4CTJ pin-compatible with other members of the SHx family?

Yes, the MC9S08SH4CTJ is pin-compatible with the MC9S08SH8CTJ and MC9S08SH16CTJ within the same 24-QFN package variant (98ASA00474D). All share identical pin assignments, electrical characteristics, and peripheral mapping. This allows direct substitution for firmware scalability - for example, upgrading from 4 KB to 8 KB flash by replacing MC9S08SH4CTJ with MC9S08SH8CTJ without any PCB modification or layout change.