NXP Semiconductors MC9S08SH4MSC

Overview

MC9S08SH4MSC from Freescale Semiconductor is an 8-bit HCS08 microcontroller with 4 KB Flash, 256 B RAM, and 24-QFN package. It features a 40-MHz CPU, internal clock source (ICS) supporting 2–20 MHz bus frequencies, 12-channel 10-bit ADC, and real-time counter with low-power oscillator-designed for embedded control in automotive body electronics and industrial sensor interfaces.

For engineers reviewing the MC9S08SH4MSC datasheet, MC9S08SH4MSC pinout, MC9S08SH4MSC application, or MC9S08SH4MSC equivalent, key selection criteria include Flash size, QFN-24 thermal performance, stop3-mode peripheral operation (ADC/ACMP/RTC), single-wire background debug support, and ICS trimming accuracy over temperature.

Technical Context

The MC9S08SH4MSC implements the HCS08 CPU core with HC08 instruction set plus BGND, supporting up to 32 interrupt/reset sources. Its ICS module integrates a frequency-locked loop (FLL) with internal reference trimmed to ±0.2% resolution and ±2% deviation across voltage and temperature.

Peripherals include two TPM modules (each with two channels), SCI with LIN break generation/detection, SPI with double-buffered TX/RX, I²C at 100 kbps, 8-bit MTIM, and RTC with external clock input or free-running 1-kHz on-chip oscillator-enabling cyclic wake-up in all power modes including stop3.

Key Specifications

Pinout & Package

MC9S08SH4MSC is housed in a 24-pin QFN package (98ASA00474D) with exposed thermal pad, copper-wire interconnect, and 0.4 mm pitch. The package supports reflow soldering per JEDEC J-STD-020 and provides enhanced thermal dissipation versus legacy gold-wire variants.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MC9S08SH4MSC, MC9S08SH8MSC offers doubled memory while maintaining full hardware compatibility-ideal for incremental firmware growth; S9KEAZ128AMLH provides architectural headroom but requires PCB redesign and software re-architecture.

Availability

MC9S08SH4MSC is available at Aetrix Electronics and suitable for automotive body electronics, industrial sensor nodes, smart appliance subsystems, and medical diagnostic handhelds requiring stable component supply and long-term lifecycle support.

Supply support for MC9S08SH4MSC 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) was a leading designer of embedded processors, analog, and connectivity solutions for automotive, industrial, and consumer markets.

The MC9S08SHx series targets cost-sensitive, low-power 8-bit control applications-emphasizing integrated analog peripherals, robust debug capability, and QFN packaging for space-constrained designs.

FAQ

What is the maximum operating frequency of the MC9S08SH4MSC?

The MC9S08SH4MSC supports a maximum CPU frequency of 40 MHz. Its internal clock source (ICS) module enables bus frequencies from 2 MHz to 20 MHz using the frequency-locked loop (FLL), with factory-trimmed internal reference ensuring ±0.2% resolution. This allows reliable high-speed execution while maintaining low-power operation in applications such as motor control and sensor interfacing where deterministic timing is critical. The MC9S08SH4MSC achieves this performance within its 24-QFN package without requiring external clock components.

Does the MC9S08SH4MSC support ultra-low-power operation with peripheral activity?

Yes, the MC9S08SH4MSC supports stop3 mode, where the RTC, ADC, analog comparator (ACMP), and GPIO retain functionality while the CPU and most clocks are halted. In this mode, it draws ultra-low current and can wake on RTC overflow, ADC conversion completion, or ACMP output edge-enabling energy-efficient periodic sensing in battery-powered applications. The MC9S08SH4MSC's 1-kHz internal oscillator powers the RTC independently, eliminating need for external timing components during deep sleep.

What debug interface does the MC9S08SH4MSC provide?

The MC9S08SH4MSC features a single-wire background debug (BKGD) interface compliant with Freescale's HCS08 standard. This allows full in-circuit debugging-including breakpoint setting, memory inspection, register read/write, and forced debug entry-using only the BKGD/MS pin and ground. The MC9S08SH4MSC integrates an on-chip debug module with two comparators, nine trigger modes, and an eight-deep FIFO for flow tracing, reducing development complexity versus multi-pin JTAG solutions.

Can the MC9S08SH4MSC operate without an external crystal?

Yes, the MC9S08SH4MSC can operate entirely from its internal clock source (ICS), which includes a frequency-locked loop (FLL) driven by a factory-trimmed internal reference. This reference achieves ±0.2% resolution and ±2% deviation over temperature and voltage, supporting stable bus frequencies from 2 MHz to 20 MHz. The MC9S08SH4MSC eliminates need for external crystals in cost-sensitive or space-constrained designs-though XTAL/EXTAL pins remain available for higher-precision timing when required.

What analog peripherals are integrated into the MC9S08SH4MSC?

The MC9S08SH4MSC integrates a 12-channel, 10-bit ADC with 2.5 µs conversion time, internal temperature sensor, and bandgap reference channel; plus a programmable analog comparator (ACMP) with interrupt capability and optional routing to TPM modules. Both peripherals operate in stop3 mode, enabling low-power analog monitoring. The MC9S08SH4MSC also supports VREFH/VREFL inputs for external reference flexibility and includes hysteresis and configurable pull-ups on all analog-capable pins (PTC[3:0]).