NXP Semiconductors MC9S08SH4CTG

Overview

MC9S08SH4CTG from Freescale Semiconductor is an 8-bit HCS08 microcontroller with 4 KB flash, 256 B RAM, and a 20 MHz bus frequency. It integrates ADC (10-bit, 12-channel), SPI, I²C, SCI, two TPM modules, RTC, and ACMP, operating across -40°C to 105°C in a 24-pin QFN package. It targets low-power industrial sensor nodes and embedded control systems requiring on-chip analog sensing and serial communication.

For engineers reviewing the MC9S08SH4CTG datasheet, MC9S08SH4CTG pinout, MC9S08SH4CTG application, or MC9S08SH4CTG equivalent, key selection criteria include its 24-QFN footprint, internal clock source (ICS) with FLL for 2–20 MHz bus operation, stop3 mode support for ultra-low-power wake-up, single-wire background debug interface, and integrated temperature sensor with bandgap reference.

Technical Context

The MC9S08SH4CTG 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) to generate stable bus clocks from 2 MHz to 20 MHz.

Peripherals operate coherently across power modes: ADC and ACMP remain functional in stop3 mode; RTC runs continuously using a free-running 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

MC9S08SH4CTG is housed in a 24-pin QFN (Quad Flat No-lead) package with 4×4 mm body and 0.5 mm pitch, featuring an exposed thermal pad. Pin assignments match the MC9S08SH8 family's 24-QFN outline (document number 98ASA00474D), confirmed via Freescale's QFN migration addendum and MC9S08SH8 datasheet Rev. 3.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MC9S08SH4CTG, MC9S08SH8CTG offers immediate memory headroom without design change, while S9KEAZ128AMLH provides architectural modernization at the cost of full requalification - making the former ideal for incremental upgrades and the latter better suited for greenfield projects demanding long-term roadmap alignment.

Availability

MC9S08SH4CTG is available at Aetrix Electronics and suitable for industrial sensor nodes, automotive body control modules, and smart appliance control systems requiring stable component supply, long-lifecycle support, and consistent parametric performance across temperature extremes.

Supply support for MC9S08SH4CTG 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 U.S.-based semiconductor company specializing in embedded processors, analog, and connectivity solutions before its acquisition by NXP Semiconductors in 2015.

The MC9S08SH4CTG belongs to the HCS08 SH-series microcontrollers, designed specifically for cost-sensitive, low-power industrial and automotive body electronics applications requiring integrated analog peripherals and robust debug capability.

FAQ

What is the maximum bus frequency supported by the MC9S08SH4CTG?

The MC9S08SH4CTG supports a maximum bus frequency of 20 MHz, achieved through its Internal Clock Source (ICS) module with frequency-locked loop (FLL). This frequency is attainable using either an external crystal (1–16 MHz) or the internal trimmed reference oscillator. The MC9S08SH4CTG datasheet specifies that the FLL maintains stability across the full industrial temperature range (-40°C to +105°C) and supply voltage (2.7–5.5 V), ensuring deterministic timing for real-time control tasks.

Does the MC9S08SH4CTG support debugging without additional hardware interfaces?

Yes, the MC9S08SH4CTG includes a single-wire background debug (BDM) interface accessible via the BKGD/MS pin, enabling full in-circuit debugging without JTAG headers or external adapters. This interface supports breakpoint setting, memory inspection, and register access during active execution. The MC9S08SH4CTG's on-chip debug module also provides two additional hardware breakpoints and an 8-deep FIFO for trace, allowing developers to diagnose timing-critical issues directly in the target system.

Can the MC9S08SH4CTG operate in ultra-low-power modes while retaining analog functionality?

Yes, the MC9S08SH4CTG supports stop3 mode, which maintains operation of the RTC, ADC, and ACMP while reducing current consumption to less than 1 µA. In this mode, the 1 kHz internal low-power oscillator continues running to drive the RTC, and the ADC can perform conversions triggered by internal or external events. This capability is explicitly documented in the MC9S08SH4CTG datasheet Rev. 3 and verified in electrical characteristics tables for -40°C to +105°C operation.

What package type and pin count does the MC9S08SH4CTG use?

The MC9S08SH4CTG uses a 24-pin QFN (Quad Flat No-lead) package with 4 mm × 4 mm body size and 0.5 mm lead pitch, including an exposed thermal pad. This package mapping is confirmed in Freescale's QFN Addendum (Rev. 0, 07/2014) under case outline 98ASA00474D, and matches the pin assignment diagram in the MC9S08SH8 datasheet Rev. 3, which covers the SH4 variant as part of the same family.

Is the MC9S08SH4CTG compatible with LIN physical layer communication?

Yes, the MC9S08SH4CTG's SCI module implements LIN 2.0-compliant features, including hardware-generated extended break fields (for master nodes) and extended break detection (for slave nodes). These capabilities are defined in the MC9S08SH4CTG datasheet Rev. 3 under the Serial Communications Interface chapter and enable direct integration into automotive body electronics networks without external LIN transceivers - though an external LIN transceiver (e.g., MC33661) remains required for bus-level signal conditioning.