NXP Semiconductors MC9S08SH32MTL

Overview

MC9S08SH32MTL from NXP (formerly Freescale) is an 8-bit HCS08 microcontroller featuring a 40-MHz CPU, 32 KB on-chip FLASH, 2 KB RAM, and integrated peripherals including 10-bit ADC, dual TPM PWM modules, SCI, SPI, I²C, ACMP, and RTC. It operates across industrial temperature range (–40°C to +105°C) in 28-TSSOP package and targets embedded control in motor drives, appliance subsystems, and sensor interface modules.

For engineers reviewing the MC9S08SH32MTL datasheet, MC9S08SH32MTL pinout, MC9S08SH32MTL application, or MC9S08SH32MTL equivalent, key selection considerations include its 32 KB FLASH with block protection, stop3-mode operation with ADC/ACMP/RTC active, single-wire BDM debug interface, and ICS clock system supporting 2–20 MHz bus frequencies with ±2% deviation over voltage and temperature.

Technical Context

The MC9S08SH32MTL implements the S08CPUV3 core with HC08 instruction set plus BGND, supports up to 32 interrupt/reset sources, and uses a frequency-locked loop (FLL) within its Internal Clock Source (ICS) module for precise bus frequency generation. Its memory subsystem includes FLASH with burst programming, security circuitry, and vector redirection capability.

Peripherals are tightly coupled to power modes: ADC and ACMP remain functional in stop3 mode; RTC runs continuously using a free-running 1-kHz on-chip oscillator; SCI supports LIN master break generation and wake-up; and TPM modules support edge- or center-aligned PWM with input capture and output compare.

Key Specifications

Pinout & Package

MC9S08SH32MTL is housed in a 28-pin Thin Shrink Small Outline Package (TSSOP) with 0.65 mm lead pitch, optimized for compact industrial control boards. Pin functions align with HCS08 family conventions and support ganged I/O writes, configurable slew rate, and hysteresis on all inputs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MC9S08SH32MTL, MC9S08SH16MTL offers identical low-power operation and peripheral functionality at lower memory cost, while S9S08SG48F1MLC extends FLASH/RAM and I²C speed for protocol-rich systems - both retain pin compatibility and stop3-mode ADC/RTC operation.

Availability

MC9S08SH32MTL is available at Aetrix Electronics and suitable for motor control subsystems, smart appliance UI controllers, industrial sensor nodes, power supply monitors, and embedded timing applications requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MC9S08SH32MTL 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

NXP Semiconductors is a global semiconductor company formed from the spin-off of Freescale Semiconductor and Philips' semiconductor division, specializing in secure connectivity solutions for automotive, industrial, and IoT markets.

The MC9S08SH32MTL belongs to the HCS08 8-bit microcontroller family, designed specifically for cost-sensitive, low-power embedded control applications where reliability, debug accessibility, and mixed-signal integration are critical - such as white goods, industrial automation, and power management subsystems.

FAQ

What is the maximum operating frequency of the MC9S08SH32MTL CPU core?

The MC9S08SH32MTL features an HCS08 S08CPUV3 core rated for up to 40 MHz operation. This maximum 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 VDD, temperature, and clock source configuration - with ICS delivering 2–20 MHz bus frequencies and ±2% deviation over full industrial range. MC9S08SH32MTL maintains full peripheral functionality at all supported bus frequencies.

Does the MC9S08SH32MTL support low-power operation with analog peripherals active?

Yes, the MC9S08SH32MTL supports stop3 mode, in which the CPU and bus clocks are halted while the ADC, ACMP, RTC, COP watchdog, and internal 1-kHz oscillator remain fully operational. This enables ultra-low-power sensor polling, threshold detection, and timekeeping without external components. Typical stop3 current is 2.5 μA at 3.3 V and 25°C, and the device wakes via ADC compare match, ACMP output edge, RTC overflow, or external interrupt - all confirmed in the Rev. 3 datasheet Section 3.6.1 and Chapter 9/8/13.

What debug interface does the MC9S08SH32MTL provide, and what are its requirements?

The MC9S08SH32MTL integrates a single-wire background debug (BDM) interface accessible via the BKGD/MS pin. It requires only one signal plus ground, eliminating the need for multi-pin JTAG headers. Debug capabilities include breakpoint setting (one active + two in on-chip module), on-chip ICE with eight-deep FIFO, and tag/force breakpoints. No external debug probe is mandatory - basic programming and verification can be performed with low-cost BDM interfaces. MC9S08SH32MTL debug operation is documented in Chapter 17 of the datasheet and supported across standard Freescale/NXP development tools.

Can the MC9S08SH32MTL operate without an external crystal?

Yes, the MC9S08SH32MTL can operate entirely from its Internal Clock Source (ICS), which uses a frequency-locked loop (FLL) locked to an internal trimmed reference. This allows full functionality - including ADC, SCI, TPM, and RTC - at bus frequencies from 2 MHz to 20 MHz with ±2% accuracy over –40°C to +105°C and full VDD range. External crystals are optional and used only when higher frequency stability (e.g., <±50 ppm) or specific frequency synthesis is required. MC9S08SH32MTL's ICS configuration is detailed in Chapter 11 of the datasheet.

What is the purpose of the ganged output feature on ports PTB and PTC?

The ganged output feature allows simultaneous state change of multiple pins - PTB[5:2] and PTC[3:0] - with a single write to their respective port data registers. This reduces instruction count and execution time for coordinated I/O operations, such as updating multi-segment LED displays, driving stepper motor phases, or toggling enable signals across multiple subsystems. Each ganged group retains individual direction control, and the feature operates identically in run, wait, and stop3 modes. MC9S08SH32MTL implements this per Chapter 6.3 of the datasheet, with no additional hardware overhead or timing penalties.