NXP Semiconductors MC9S08SH32MWL

Overview

MC9S08SH32MWL from NXP (formerly Freescale) is an 8-bit HCS08 microcontroller with 32 KB on-chip FLASH, 2 KB RAM, and a 40-MHz CPU core. It integrates ADC (16-channel, 10-bit), dual TPM PWM modules, SCI/LIN, SPI, I²C, RTC, and analog comparators - designed for cost-sensitive industrial control and automotive body electronics.

For engineers reviewing the MC9S08SH32MWL datasheet, MC9S08SH32MWL pinout, MC9S08SH32MWL application, or MC9S08SH32MWL equivalent, key selection criteria include its stop3-mode operation with ADC/ACMP active, 1.5% internal clock accuracy over voltage/temperature, and single-wire background debug interface for space-constrained embedded designs.

Technical Context

The MC9S08SH32MWL implements the S08CPUV3 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, enabling bus frequencies from 2 MHz to 20 MHz at ±1.5% deviation with internal temperature compensation.

Peripherals operate across power modes: ADC and ACMP remain functional in stop3 mode; RTC runs continuously on a free-running 1-kHz on-chip oscillator; SCI supports LIN master break generation and slave break detection with wake-up capability - all coordinated via centralized power management registers (SPMSC1/SPMSC2).

Key Specifications

Pinout & Package

MC9S08SH32MWL is packaged in a 28-pin TSSOP (Thin Shrink Small Outline Package) with 23 GPIOs, 1 output-only pin, and dedicated peripheral function pins including BKGD/MS, RESET, XOSC, VDD/VSS, and analog supply pins (VDDAD/VSSAD).

Key Features

Applications

Equivalent & Alternatives

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

Compared with S9S08SG32E2MTJR and MC9RS08LA8CP, the MC9S08SH32MWL delivers optimal balance of peripheral richness (dual TPM, LIN-SCI, 16-channel ADC), low-power stop3 operation, and mature toolchain support - making it ideal for legacy-compatible industrial upgrades and mid-tier automotive modules.

Availability

MC9S08SH32MWL is available at Aetrix Electronics and suitable for automotive body electronics, industrial temperature controllers, smart appliance motor drives, and low-power sensor hubs requiring stable component supply across extended product lifecycles.

Supply support for MC9S08SH32MWL 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 leader focused on secure connectivity solutions for automotive, industrial, and IoT applications.

The MC9S08SH32MWL belongs to NXP's legacy HCS08 microcontroller family, engineered for cost-effective, low-power embedded control in harsh environments - emphasizing robust peripheral integration, debug accessibility, and long-term manufacturability.

FAQ

What is the maximum operating frequency of the MC9S08SH32MWL CPU core?

The MC9S08SH32MWL features an HCS08 CPU core rated for up to 40 MHz operation. Its actual bus frequency depends on the selected clock source and ICS configuration - ranging from 2 MHz to 20 MHz when using the internal clock source (ICS), or scaling directly with external crystal/resonator frequency in XOSC mode. The core executes instructions at bus speed, delivering deterministic real-time performance for time-critical control loops.

Does the MC9S08SH32MWL support LIN communication natively?

Yes, the MC9S08SH32MWL's SCI module supports LIN 2.x protocol natively. It provides hardware-assisted LIN master functionality including extended break generation, and LIN slave capabilities such as extended break detection and wake-up on active edge - eliminating need for external LIN transceivers in basic implementations. The MC9S08SH32MWL requires only a standard LIN transceiver (e.g., TJA1020) for physical layer compliance.

What power-saving modes are available on the MC9S08SH32MWL, and which peripherals remain active in stop3 mode?

The MC9S08SH32MWL offers Run, Wait, Stop2, and Stop3 modes. In Stop3 - its deepest low-power state - the ADC, analog comparators (ACMP), real-time counter (RTC), and SCI (with wake-up enabled) remain fully operational. This allows continuous sensor monitoring and timed wake-up without CPU intervention, achieving sub-2 μA current draw while preserving critical functionality - a key advantage of the MC9S08SH32MWL in battery-powered systems.

Can the MC9S08SH32MWL's internal clock source meet timing requirements without an external crystal?

Yes, the MC9S08SH32MWL's Internal Clock Source (ICS) achieves ±1.5% bus frequency accuracy over -40°C to +105°C using internal temperature compensation - sufficient for UART, SPI, I²C, and most control-loop timing. While external crystals provide higher precision, the ICS eliminates BOM cost and PCB space for timing components, making the MC9S08SH32MWL suitable for cost-sensitive applications where absolute timing tolerance ≤1.5% is acceptable.

How many I/O pins does the MC9S08SH32MWL provide, and what advanced I/O features are supported?

The MC9S08SH32MWL provides 23 general-purpose I/O pins and 1 output-only pin in its 28-TSSOP package. Each pin supports configurable pull-up devices, programmable slew rate and drive strength, and interrupt-on-change with selectable polarity. Ganged output is available on PTB[5:2] and PTC[3:0], allowing atomic multi-pin state updates - a feature used in LED matrix control or parallel data latching within the MC9S08SH32MWL's I/O subsystem.