NXP Semiconductors MC9S08SH8CTGR

Overview

MC9S08SH8CTGR from Freescale Semiconductor is an 8-bit HCS08 microcontroller featuring a 40-MHz CPU, 8 KB flash memory, and 512 B RAM. It integrates ADC (12-channel, 10-bit), dual TPM modules, SCI, SPI, I²C, RTC, and analog comparator - all operating in Stop3 mode. Designed for cost-sensitive embedded control in automotive body electronics and industrial sensors.

For engineers reviewing the MC9S08SH8CTGR datasheet, MC9S08SH8CTGR pinout, MC9S08SH8CTGR application, or MC9S08SH8CTGR equivalent, key selection criteria include QFN-24 package compatibility, internal clock source (ICS) with FLL supporting 2–20 MHz bus frequency, low-voltage detection with interrupt/reset, and single-wire background debug interface for in-circuit development.

Technical Context

The MC9S08SH8CTGR implements the HCS08 CPU core with HC08 instruction set extension including 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 across power modes: ADC and ACMP remain functional in Stop3 mode using the on-chip 1-kHz low-power oscillator; RTC runs free-running on the same oscillator for cyclic wake-up without external components; SCI supports LIN master break generation and slave break detection, enabling automotive sub-network communication.

Key Specifications

Pinout & Package

MC9S08SH8CTGR is housed in a 24-pin QFN package (case outline 98ASA00474D) with 4×4 mm footprint, 0.5 mm lead pitch, and exposed thermal pad for enhanced thermal dissipation in thermally constrained environments.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MC9S08SH8CTGR, MC9S08AW60CFGE offers expanded memory and CAN but demands larger board area and different layout; S9KEAZ128AMLH delivers modern ARM architecture and scalability but increases BOM cost and design complexity - MC9S08SH8CTGR remains optimal for compact, cost-driven 8-bit control where proven reliability and minimal footprint are critical.

Availability

MC9S08SH8CTGR is available at Aetrix Electronics and suitable for automotive body electronics, industrial sensor nodes, smart lighting dimmers, and appliance motor control boards requiring stable component supply and long-term manufacturability.

Supply support for MC9S08SH8CTGR 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 mixed-signal semiconductors for automotive, industrial, and consumer markets.

The MC9S08SH8CTGR belongs to the HCS08 microcontroller family, engineered for cost-sensitive, low-power embedded control applications demanding high integration, robust debug support, and automotive-grade reliability in compact packages.

FAQ

What is the maximum operating frequency of the MC9S08SH8CTGR CPU core?

The MC9S08SH8CTGR 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 the frequency-locked loop (FLL) to deliver a stable bus clock within the 2–20 MHz range, and external timing sources (e.g., crystal) meet specified load capacitance and drive level requirements. The 40-MHz core speed enables deterministic execution of real-time control loops in applications such as motor commutation and sensor fusion.

Does the MC9S08SH8CTGR support debugging without dedicated JTAG pins?

Yes, the MC9S08SH8CTGR supports single-wire background debug (BDM) via the BKGD/MS pin, eliminating the need for a full JTAG interface. This allows in-circuit programming and debugging using only one dedicated pin plus ground, significantly reducing PCB routing complexity and pin count. The on-chip debug module includes breakpoint capability and an 8-deep FIFO for trace, making the MC9S08SH8CTGR suitable for space-constrained and cost-sensitive designs where traditional debug headers are impractical.

Can the MC9S08SH8CTGR operate in ultra-low-power modes while retaining analog functionality?

Yes, the MC9S08SH8CTGR supports Stop3 mode, in which the CPU and most peripherals halt while retaining operation of the RTC, ADC, and analog comparator - all powered by the on-chip 1-kHz low-power oscillator. In this mode, typical current consumption drops below 2 µA, and analog functions remain fully accessible for wake-on-event sensing. This capability makes the MC9S08SH8CTGR ideal for battery-powered sensor nodes that must maintain responsiveness without continuous CPU activity.

What clock sources are available for the MC9S08SH8CTGR, and how do they affect system design?

The MC9S08SH8CTGR offers two primary clock sources: an external crystal/ceramic resonator (XOSC) supporting 31.25 kHz–16 MHz, and the internal clock source (ICS) with FLL for generating 2–20 MHz bus clocks from a trimmed internal reference. The ICS eliminates external timing components in cost-sensitive applications, while XOSC provides higher precision for time-critical functions like LIN communication. Both sources are supported simultaneously, allowing dynamic switching - for example, using ICS during normal operation and XOSC for calibration or high-accuracy timing tasks.

Is the MC9S08SH8CTGR pin-compatible with other members of the HCS08 SH-series?

No, the MC9S08SH8CTGR is not universally pin-compatible across the SH-series. While it shares the 24-QFN package with MC9S08SH4, differences in peripheral mapping - such as SCI/SPI/I²C pin assignments and ADC channel routing - prevent drop-in replacement without firmware and layout verification. For example, MC9S08SH4 lacks the second TPM module and has reduced ADC channel count. Always consult the specific device's pin assignment table (Section 2.1 of the MC9S08SH8 Rev. 3 datasheet) before substituting, as even same-package variants may differ electrically and functionally.