NXP Semiconductors MC9S08SH4CFK

Overview

MC9S08SH4CFK 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 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 automotive body control modules and industrial sensor nodes.

For engineers reviewing the MC9S08SH4CFK datasheet, MC9S08SH4CFK pinout, MC9S08SH4CFK application, or MC9S08SH4CFK equivalent, key selection criteria include its 24-QFN package, single-wire background debug interface, FLASH block protection, internal 1-kHz low-power oscillator for wake-up, and support for LIN-compliant SCI communication in automotive subsystems.

Technical Context

The MC9S08SH4CFK implements the HCS08 CPU core with HC08 instruction set plus BGND, supports up to 32 interrupt/reset sources, and uses an internal clock source (ICS) with frequency-locked loop (FLL) trimmed to ±0.2% resolution and ±2% deviation over voltage/temperature. Its power management includes two very low-power stop modes and reduced-power wait mode.

Peripherals are designed for embedded real-time control: the 12-channel 10-bit ADC achieves 2.5 µs conversion and operates in stop3; the analog comparator supports edge-triggered interrupts and routing to TPM; the SCI module provides LIN master break generation and slave break detection; and the RTC runs free-running on the 1-kHz internal oscillator across all MCU modes.

Key Specifications

Pinout & Package

MC9S08SH4CFK is housed in a 24-pin QFN package (case outline 98ASA00474D), measuring 4 mm × 4 mm × 0.8 mm with 0.5 mm pitch and thermally enhanced exposed pad. The package uses copper wire bonding per Freescale's QFN migration addendum.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MC9S08SH4CFK, MC9S08SH8CFK offers direct pin-compatible upgrade path with doubled memory, while S9S08SG48E1MTJR provides architectural evolution at the cost of PCB redesign - making MC9S08SH4CFK optimal for cost-sensitive, volume production of mature 8-bit control functions.

Availability

MC9S08SH4CFK is available at Aetrix Electronics and suitable for automotive body electronics, industrial sensor nodes, smart lighting controllers, and appliance motor control systems requiring stable component supply and long-lifecycle support.

Supply support for MC9S08SH4CFK 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 was a leading designer of embedded processors, analog, and connectivity solutions before its acquisition by NXP Semiconductors in 2015. Its HCS08 microcontroller family emphasized cost-effective, low-power 8-bit control for automotive and industrial markets.

The MC9S08SH4CFK belongs to the HCS08 SH-series, engineered for space-constrained, thermally demanding applications requiring robust debug capability, LIN-ready communication, and guaranteed operation across extended temperature ranges.

FAQ

What is the maximum operating frequency of the MC9S08SH4CFK CPU core?

The MC9S08SH4CFK features an HCS08 CPU core rated for up to 40 MHz operation. This maximum frequency is achievable when the internal clock source (ICS) is configured with appropriate FLL settings and external crystal or resonator support. Bus frequency scales directly with core speed, enabling high-throughput instruction execution for time-critical embedded tasks within the MC9S08SH4CFK's power envelope.

Does the MC9S08SH4CFK support LIN communication natively?

Yes, the MC9S08SH4CFK supports LIN communication through its SCI module, which includes hardware-assisted LIN 2.0-compliant features: master-mode extended break generation and slave-mode extended break detection. These capabilities are implemented in silicon and require no bit-banging - reducing CPU load and improving timing accuracy in automotive subnetworks where the MC9S08SH4CFK serves as a LIN node.

What package type and dimensions does the MC9S08SH4CFK use?

The MC9S08SH4CFK is packaged in a 24-pin QFN (quad flat no-lead) with case outline number 98ASA00474D. Its physical dimensions are 4.0 mm × 4.0 mm × 0.8 mm, with 0.5 mm pin pitch and an exposed thermal pad. This copper-wire bonded package replaces earlier gold-wire variants and is optimized for thermal performance and automated assembly in compact PCB layouts using the MC9S08SH4CFK.

Can the MC9S08SH4CFK operate in low-power stop modes while maintaining real-time wake-up capability?

Yes, the MC9S08SH4CFK supports Stop3 mode - a very low-power state where the CPU, flash, and most peripherals are disabled, yet the real-time interrupt (RTI) module remains active using the dedicated 1-kHz internal low-power oscillator. This allows the MC9S08SH4CFK to wake up autonomously at programmable intervals (e.g., every 125 ms to 8 s) without external components, making it ideal for battery-powered or energy-conscious applications.

Is there on-chip debug support for the MC9S08SH4CFK, and what interface does it use?

Yes, the MC9S08SH4CFK includes full on-chip debug support via a single-wire background debug (BDM) interface using the BKGD/MS pin. This interface enables non-intrusive in-circuit debugging, flash programming, and real-time trace with breakpoints - all without requiring additional pins or external debug hardware. The MC9S08SH4CFK's debug module contains two comparators, nine trigger modes, and an eight-deep FIFO for advanced analysis.