NXP Semiconductors MC9S08SH4CTJR

Overview

MC9S08SH4CTJR from Freescale Semiconductor is an 8-bit HCS08 microcontroller featuring a 40-MHz CPU, 4 KB flash memory, and integrated peripherals including 12-channel 10-bit ADC, dual TPM modules, SCI, SPI, I²C, RTC, and analog comparator. It operates across -40°C to 105°C with support for stop3 low-power mode and internal 1-kHz real-time oscillator - used in industrial sensor nodes and embedded control systems requiring deterministic timing and minimal external components.

For engineers reviewing the MC9S08SH4CTJR datasheet, MC9S08SH4CTJR pinout, MC9S08SH4CTJR application, or MC9S08SH4CTJR equivalent, key selection criteria include its 24-QFN package, 17 GPIOs with configurable slew rate and pull-ups, single-wire background debug interface, and compatibility with legacy SH8-series toolchains and development boards.

Technical Context

The MC9S08SH4CTJR implements the HCS08 CPU core with HC08 instruction set extension (including BGND), supporting up to 32 interrupt/reset sources and executing instructions at up to 40 MHz. 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 are designed for mixed-signal embedded control: the 10-bit ADC achieves 2.5 µs conversion time and supports temperature sensing and internal bandgap reference; the RTC runs on a free-running 1-kHz low-power oscillator in all modes; and the ACMP output can be routed to TPM for hardware-triggered PWM events - enabling autonomous wake-up and event-driven operation without CPU intervention.

Key Specifications

Pinout & Package

MC9S08SH4CTJR is housed in a 24-pin QFN package (98ASA00474D) with 0.5 mm pitch and exposed thermal pad. The package supports reflow soldering and provides mechanical robustness for high-vibration environments.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MC9S08SH4CTJR, MC9S08SH8CTJR offers seamless memory scalability within the same footprint and toolchain, while S9KEAZ128AMLH represents a platform-level shift toward 32-bit performance and modern peripherals - making the former ideal for cost-sensitive incremental upgrades and the latter appropriate for architectural refreshes.

Availability

MC9S08SH4CTJR is available at Aetrix Electronics and suitable for industrial sensor nodes, automotive body control modules, and smart appliance controllers requiring stable component supply, long-term lifecycle support, and consistent parametric performance across temperature extremes.

Supply support for MC9S08SH4CTJR 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 MC9S08SH4CTJR belongs to the HCS08 microcontroller family, engineered for cost-sensitive, low-power embedded control applications where deterministic real-time behavior, mixed-signal integration, and debug simplicity are critical.

FAQ

What is the maximum operating frequency of the MC9S08SH4CTJR?

The MC9S08SH4CTJR features a 40-MHz HCS08 CPU core. Its bus frequency is programmable from 2 MHz to 20 MHz via the internal clock source (ICS) frequency-locked loop (FLL). This allows designers to balance performance against power consumption - for example, running at 10 MHz in active mode and dropping to 2 MHz during intermittent sensing tasks to extend battery life. The MC9S08SH4CTJR maintains full functionality across this range without requiring external clock sources.

Does the MC9S08SH4CTJR support in-circuit debugging?

Yes, the MC9S08SH4CTJR includes a single-wire background debug (BDM) interface compliant with Freescale's BDM specification. It supports real-time register inspection, memory read/write, breakpoint setting (one hardware breakpoint plus two more in the on-chip debug module), and forced execution control. This capability is implemented using only the BKGD/MS pin (PTA1), minimizing PCB routing complexity and eliminating the need for dedicated JTAG headers. The MC9S08SH4CTJR debug module also includes an 8-deep FIFO for change-of-flow tracing.

What are the power-saving modes supported by the MC9S08SH4CTJR?

The MC9S08SH4CTJR supports three primary low-power modes: Wait mode (CPU halted, peripherals active), Stop2 (all clocks stopped except RTC oscillator), and Stop3 (only 1-kHz RTC oscillator and ACMP remain active). In Stop3 mode, RAM contents and selected registers are retained, enabling sub-1 µA quiescent current - ideal for battery-powered devices requiring periodic wake-up. The MC9S08SH4CTJR exits Stop3 via RTC overflow, ACMP event, or external interrupt, ensuring responsive yet energy-efficient operation.

Can the MC9S08SH4CTJR operate without an external crystal?

Yes, the MC9S08SH4CTJR can operate entirely from its internal clock source (ICS), which combines a precision-trimmed internal reference oscillator and a frequency-locked loop (FLL). This configuration supports bus frequencies from 2 MHz to 20 MHz without any external components. The MC9S08SH4CTJR also includes a 1-kHz internal low-power oscillator for RTC and stop-mode wake-up - eliminating the need for external crystals in cost-sensitive or space-constrained designs such as portable medical devices or smart sensors.

Is the MC9S08SH4CTJR pin-compatible with other members of the SH8 family?

Yes, the MC9S08SH4CTJR shares identical pinout and package (24-QFN, 98ASA00474D) with the MC9S08SH8CTJR and MC9S08SH8 series devices. This enables drop-in replacement for memory upgrades - for example, substituting MC9S08SH4CTJR with MC9S08SH8CTJR requires no PCB changes and preserves all peripheral mappings, GPIO assignments, and debug interface connections. The MC9S08SH4CTJR maintains full functional compatibility with SH8-series development tools, reference schematics, and software libraries.