NXP Semiconductors MC9S08SH8CFK

Overview

MC9S08SH8CFK from Freescale Semiconductor is an 8-bit HCS08 microcontroller featuring a 40-MHz CPU, 8 KB flash memory, and integrated peripherals including 10-bit ADC, analog comparator, SCI, SPI, I²C, two TPM modules, RTC, and low-power stop3 mode. It operates across -40°C to 105°C with 2.7–5.5 V supply and uses a 24-pin QFN package (98ASA00474D) with exposed pad.

For engineers reviewing the MC9S08SH8CFK datasheet, MC9S08SH8CFK pinout, MC9S08SH8CFK application, or MC9S08SH8CFK equivalent, key selection considerations include its 24-QFN footprint, internal clock source with FLL (2–20 MHz bus), real-time counter with 1-kHz low-power oscillator, ADC temperature sensor support, and single-wire background debug interface for embedded control in space-constrained industrial and automotive subsystems.

Technical Context

The MC9S08SH8CFK implements the HCS08 CPU core with HC08 instruction set plus BGND, supporting up to 32 interrupt/reset sources. Its internal clock source (ICS) includes a frequency-locked loop (FLL) trimmed to ±0.2% resolution and ±2% deviation over voltage and temperature.

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

Key Specifications

Pinout & Package

MC9S08SH8CFK is housed in a 24-pin QFN package (case outline 98ASA00474D), 4 mm × 4 mm body, 0.5 mm pitch, with exposed thermal pad for enhanced heat dissipation and EMI reduction.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MC9S08SH4CFK, the MC9S08SH8CFK provides double flash and RAM for complex control logic and data logging; versus S9KEAZ128AMLH, it delivers proven 8-bit determinism, lower active power, and legacy toolchain compatibility - making it optimal for cost-sensitive, volume industrial and automotive ECUs where upgrade path is not required.

Availability

MC9S08SH8CFK is available at Aetrix Electronics and suitable for motor control subsystems, automotive body controllers, industrial sensor nodes, and smart appliance control boards requiring stable component supply and long-term industrial lifecycle support.

Supply support for MC9S08SH8CFK 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 MC9S08SH8CFK belongs to the HCS08 microcontroller family, engineered for cost-effective, low-power 8-bit control in space-constrained and thermally demanding environments such as automotive submodules and industrial edge sensors.

FAQ

What is the maximum operating frequency of the MC9S08SH8CFK?

The MC9S08SH8CFK features an HCS08 CPU core rated for up to 40 MHz operation. Its internal clock source (ICS) supports bus frequencies from 2 MHz to 20 MHz using the frequency-locked loop (FLL), with external crystal oscillator options extending system timing precision up to 16 MHz. The 40-MHz CPU rating reflects instruction execution speed under optimal conditions, while actual bus frequency depends on ICS configuration and supply voltage.

Does the MC9S08SH8CFK support in-circuit debugging?

Yes, the MC9S08SH8CFK includes a single-wire background debug interface accessible via the BKGD/MS pin. This allows full in-circuit debugging - including breakpoint setting, register inspection, and memory access - without requiring dedicated JTAG pins. The on-chip debug module supports one hardware breakpoint plus two additional breakpoints, and integrates an eight-deep FIFO for change-of-flow tracing during development and validation of the MC9S08SH8CFK.

What power-saving modes does the MC9S08SH8CFK offer?

The MC9S08SH8CFK provides three primary low-power modes: Wait mode (reduced power with clocks active), Stop2 (deep sleep with limited wake-up sources), and Stop3 (deepest sleep with RTC, ADC, and ACMP remaining operational). In Stop3 mode, current consumption drops below 1 µA while retaining real-time wake-up capability via the 1-kHz internal oscillator - enabling energy-efficient operation in battery-backed MC9S08SH8CFK deployments.

Is the MC9S08SH8CFK pin-compatible with other members of the SH8 family?

Yes, the MC9S08SH8CFK shares identical pinout and package (24-QFN, 98ASA00474D) with other SH8 variants including MC9S08SH4CFK and MC9S08SH16CFK. This allows hardware reuse across firmware variants - for example, designing a single PCB that supports 4 KB, 8 KB, or 16 KB flash versions by changing only the programmed device. All share the same peripheral mapping, register layout, and electrical characteristics per pin.

What analog peripherals are integrated into the MC9S08SH8CFK?

The MC9S08SH8CFK integrates a 12-channel, 10-bit ADC with 2.5 µs conversion time, internal temperature sensor, and selectable bandgap reference; plus a dual-input analog comparator (ACMP) with interrupt capability and optional routing to TPM for event-triggered PWM. Both peripherals remain functional in Stop3 mode, enabling continuous monitoring without waking the CPU - a key design advantage for thermal management and battery supervision in the MC9S08SH8CFK.