NXP Semiconductors MC9S08SH8MSC

Overview

MC9S08SH8MSC from Freescale Semiconductor is an 8-bit HCS08 microcontroller featuring a 40-MHz CPU, 8 KB on-chip 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 low-power embedded control in automotive body electronics and industrial sensor nodes.

For engineers reviewing the MC9S08SH8MSC datasheet, MC9S08SH8MSC pinout, MC9S08SH8MSC application, or MC9S08SH8MSC equivalent, key selection criteria include its 24-QFN package, internal clock source with FLL (2–20 MHz bus frequency), 17 GPIOs with configurable slew rate and pull-ups, and single-wire background debug interface for in-circuit development.

Technical Context

The MC9S08SH8MSC 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), enabling stable bus frequencies from 2 MHz to 20 MHz without external crystal.

Peripherals operate across power modes: ADC and ACMP retain functionality in Stop3 mode; RTC runs continuously using on-chip 1-kHz low-power oscillator; SCI supports LIN master break generation and wake-up on active edge; TPM modules support input capture, output compare, and edge-/center-aligned PWM on four total channels.

Key Specifications

Pinout & Package

MC9S08SH8MSC 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 performance in space-constrained applications.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MC9S08AC16CFGE, the MC9S08SH8MSC offers smaller footprint and lower system cost for mid-complexity designs, while MC9RS08KA2CSC trades peripheral richness for lowest bill-of-materials - making MC9S08SH8MSC the optimal balance of integration, power efficiency, and QFN compactness.

Availability

MC9S08SH8MSC is available at Aetrix Electronics and suitable for automotive body electronics, industrial sensor nodes, smart appliance control, and portable medical diagnostics requiring stable component supply and long-term manufacturability.

Supply support for MC9S08SH8MSC 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) is a fabless semiconductor company specializing in microcontrollers, analog, and connectivity solutions for automotive, industrial, and consumer markets.

The MC9S08SH8MSC belongs to the HCS08 family - designed specifically for cost-sensitive, low-power embedded control applications requiring robust analog integration, real-time responsiveness, and debug-friendly development.

FAQ

What is the maximum operating frequency of the MC9S08SH8MSC CPU core?

The MC9S08SH8MSC features an HCS08 CPU core rated for up to 40 MHz operation. However, the achievable bus frequency depends on the selected clock source: the internal clock source (ICS) with FLL supports 2–20 MHz bus speeds, while external crystal oscillator (XOSC) configurations allow full 40-MHz operation when using a 16-MHz crystal with appropriate PLL multiplication. The MC9S08SH8MSC datasheet specifies timing parameters validated up to 40 MHz under 2.7–5.5 V and –40°C to +125°C conditions.

Does the MC9S08SH8MSC support crystal-less operation?

Yes, the MC9S08SH8MSC supports crystal-less operation via its Internal Clock Source (ICS) module, which includes a frequency-locked loop (FLL) driven by a precision-trimmed internal reference oscillator. This allows stable bus frequencies from 2 MHz to 20 MHz without external crystal or resonator. The internal reference achieves 0.2% resolution and ±2% deviation across voltage and temperature - sufficient for UART communication, PWM generation, and sensor sampling in most industrial and automotive applications. The MC9S08SH8MSC does not require external timing components for basic functionality.

Which power-saving modes does the MC9S08SH8MSC support, and what peripherals remain active in Stop3 mode?

The MC9S08SH8MSC supports Run, Wait, Stop2, and Stop3 modes. In Stop3 mode - its deepest low-power state - the MC9S08SH8MSC draws less than 1 µA while retaining operation of the RTC (running on 1-kHz internal oscillator), ADC, analog comparator (ACMP), and SCI interface with wake-on-active-edge capability. This enables periodic sensor sampling, time-stamped event logging, and asynchronous communication readiness without external components. Stop3 is entered via software command and exited by interrupt or reset, making it ideal for battery-powered endpoints.

Can the MC9S08SH8MSC ADC measure temperature directly?

Yes, the MC9S08SH8MSC includes an integrated temperature sensor connected to a dedicated ADC channel. When enabled, this sensor provides a voltage output proportional to die temperature, digitized by the 10-bit ADC with 2.5 µs conversion time. Calibration coefficients are stored in FLASH memory and accessible via predefined addresses, allowing firmware to compute absolute temperature with typical accuracy of ±3°C over –40°C to +125°C. The MC9S08SH8MSC temperature sensor operates in Run, Wait, and Stop3 modes - enabling thermal monitoring even during ultra-low-power operation.

Is the MC9S08SH8MSC pin-compatible with other members of the HCS08 SH-series?

No, the MC9S08SH8MSC is not pin-compatible with other SH-series variants such as MC9S08SH4 or MC9S08SH16, despite sharing the same 24-QFN package outline. Pin assignments differ significantly across memory variants - for example, ADC channel mapping, peripheral signal routing (e.g., TPM outputs), and GPIO interrupt capabilities vary between models. The MC9S08SH8MSC datasheet explicitly defines its unique pinout in Section 2.1 ("Device Pin Assignment"), and migration requires verification of signal-level compatibility and firmware adaptation. Always consult the specific MC9S08SH8MSC mechanical drawing (98ASA00474D) and electrical characteristics before board reuse.