NXP Semiconductors MC9S08SH8MTG

Overview

MC9S08SH8MTG 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), analog comparator, RTC, two TPM modules, SCI, SPI, and I²C interfaces. Designed for embedded control in space-constrained industrial sensors and motor drive subsystems.

For engineers reviewing the MC9S08SH8MTG datasheet, MC9S08SH8MTG pinout, MC9S08SH8MTG application, or MC9S08SH8MTG equivalent, key selection criteria include its 24-QFN package, stop3-mode operation with ADC/ACMP active, internal clock source (ICS) supporting 2–20 MHz bus frequencies, and single-wire background debug interface.

Technical Context

The MC9S08SH8MTG 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).

Peripherals operate 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 wake-up detection. All I/O pins support configurable pull-ups, slew rate, and drive strength.

Key Specifications

Pinout & Package

MC9S08SH8MTG is housed in a 24-pin QFN package (case outline 98ASA00474D per Freescale QFN Addendum Rev. 0, July 2014), with 0.5 mm pitch, 4 mm × 4 mm body, and exposed thermal pad for enhanced thermal dissipation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MC9S08SH8MTG, MC9S08SH4MTG offers identical functionality at lower memory density for cost-sensitive volume production, while S9S08SG8E2MTJ provides backward-compatible migration with enhanced watchdog flexibility and formal automotive qualification readiness.

Availability

MC9S08SH8MTG is available at Aetrix Electronics and suitable for industrial sensor nodes, motor control subsystems, smart lighting drivers, and home appliance control panels requiring stable component supply and long-term obsolescence management.

Supply support for MC9S08SH8MTG 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 leading designer of embedded processors, analog, and connectivity solutions before its acquisition by NXP Semiconductors in 2015. Its HCS08 MCU family emphasized low-power, cost-effective control for industrial and consumer applications.

The MC9S08SH8MTG belongs to the HCS08 SH-series microcontrollers, designed specifically for space-constrained, battery-aware embedded systems requiring mixed-signal integration, robust debug capability, and seamless migration from legacy HC08 platforms.

FAQ

What is the maximum operating frequency of the MC9S08SH8MTG CPU core?

The MC9S08SH8MTG features an HCS08 CPU core rated for up to 40 MHz operation. This frequency is achievable when the internal clock source (ICS) is configured to deliver a 20 MHz bus clock with a 2× prescaler, or directly from an external crystal oscillator. The actual sustained frequency depends on supply voltage (2.7–5.5 V) and ambient temperature (−40°C to 105°C), as specified in the Electrical Characteristics section of the Rev. 3 datasheet.

Does the MC9S08SH8MTG support debugging without additional hardware pins?

Yes, the MC9S08SH8MTG supports single-wire background debug (BDM) via the BKGD/MS pin, eliminating the need for dedicated JTAG or SWD pins. This interface enables full in-circuit debugging - including breakpoint setting, register inspection, and memory read/write - using only one I/O pin and ground. The MC9S08SH8MTG's on-chip debug module includes two comparators and an eight-deep FIFO for trace capture, making it suitable for resource-constrained development environments.

Can the MC9S08SH8MTG ADC operate while the MCU is in stop mode?

Yes, the MC9S08SH8MTG ADC remains fully operational in stop3 mode - the deepest low-power state that retains RAM content and allows selected peripherals to run. In this mode, the ADC can perform conversions, trigger interrupts on completion, and use the internal bandgap reference or temperature sensor channel. This capability enables event-driven sensing (e.g., wake-on-threshold) without CPU intervention, significantly reducing average system power consumption.

What package type and dimensions does the MC9S08SH8MTG use?

The MC9S08SH8MTG is packaged in a 24-pin QFN (Quad Flat No-lead) with 4 mm × 4 mm body size, 0.5 mm pin pitch, and an exposed thermal pad. Its official case outline is 98ASA00474D, reflecting Freescale's copper-wire packaging migration documented in the QFN_Addendum Rev. 0 (July 2014). This package supports automated assembly and provides superior thermal performance compared to equivalent TSSOP or SOIC variants.

Is the MC9S08SH8MTG pin-compatible with other members of the SH-series?

The MC9S08SH8MTG shares identical pinout and package (24-QFN) with MC9S08SH4MTG and MC9S08SH16MTG, enabling direct hardware reuse across memory variants. However, it is not pin-compatible with 20-pin or 16-pin SH-series devices (e.g., MC9S08QG8 or MC9RS08KB12), nor with non-SH HCS08 derivatives like the AC or AW families. Pin compatibility is strictly limited to the 24-QFN SH-series subset defined in the MC9S08SH8 Datasheet Rev. 3, Section 2.1.