NXP Semiconductors MC9S08SH32CWLR

Overview

MC9S08SH32CWLR from NXP (formerly Freescale) is an 8-bit HCS08 microcontroller with 32 KB Flash, 1 KB RAM, and a 40-MHz CPU core. It integrates ADC (16-channel, 10-bit), dual TPM PWM modules, SCI/LIN, SPI, I²C, ACMP, RTC, and supports stop3 mode for ultra-low-power operation in battery-powered sensor nodes and motor control interfaces.

For engineers reviewing the MC9S08SH32CWLR datasheet, MC9S08SH32CWLR pinout, MC9S08SH32CWLR application, or MC9S08SH32CWLR equivalent, key selection criteria include Flash endurance over voltage/temperature, real-time counter operation in all power modes, LIN-compliant SCI with extended break support, and on-chip security circuitry preventing unauthorized memory access.

Technical Context

The MC9S08SH32CWLR implements the HCS08 CPUV3 core with HC08 instruction set plus BGND, supporting up to 32 interrupt/reset sources. Its internal clock source (ICS) delivers bus frequencies from 2 MHz to 20 MHz using FLL with precision-trimmed internal reference (0.2% resolution, 2% deviation over temp/voltage).

Peripherals operate across power modes: ADC and ACMP run in stop3; RTC uses free-running 1-kHz on-chip oscillator for cyclic wake-up; SCI supports LIN master/slave extended break generation/detection; TPM modules provide edge- or center-aligned PWM with input capture and output compare.

Key Specifications

Pinout & Package

MC9S08SH32CWLR is housed in a 28-pin TSSOP package (JEDEC MO-153AA), with 23 GPIOs, 1 output-only pin, 8 interrupt-capable inputs, and dedicated pins for XOSC, RESET, BKGD/MS, VDD/VSS, and analog supply (VDDAD/VSSAD).

Key Features

Applications

Equivalent & Alternatives

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

Compared with S9S08SH32F1MLC and MC9S08AW32CFUE, the MC9S08SH32CWLR offers optimal balance of compact 28-TSSOP packaging, LIN-ready SCI, ultra-low-power stop3 operation, and integrated security - making it ideal for cost-sensitive, space-limited embedded controls where CAN or EEPROM are unnecessary.

Availability

MC9S08SH32CWLR is available at Aetrix Electronics and suitable for motor control interfaces, automotive body controllers, industrial sensor nodes, smart appliance timers, and LIN-based subsystems requiring stable component supply across production lifecycles.

Supply support for MC9S08SH32CWLR 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, with roots in Freescale's embedded MCU heritage.

The MC9S08SH32CWLR belongs to the HCS08 microcontroller family designed specifically for cost-optimized, low-power embedded control in automotive body electronics and industrial automation where reliability, small footprint, and LIN/UART peripheral integration are critical.

FAQ

What is the maximum operating frequency of the MC9S08SH32CWLR CPU core?

The MC9S08SH32CWLR features an HCS08 CPUV3 core rated for up to 40 MHz operation. This frequency is achievable when driven by the internal clock source (ICS) configured for 20 MHz bus speed with appropriate prescaling, or via external crystal up to 16 MHz with FLL multiplication. The core maintains full instruction compatibility and deterministic timing at this rate, supporting real-time control loops with sub-microsecond response.

Does the MC9S08SH32CWLR support LIN communication natively?

Yes, the MC9S08SH32CWLR supports LIN communication natively through its SCI module, which implements LIN 2.0/2.1 physical layer requirements including hardware-generated extended break (13–25 bit) for master nodes and extended break detection for slave nodes. No external LIN transceiver is required for basic node functionality, though one is needed for bus termination and level translation in production networks.

What power-saving modes does the MC9S08SH32CWLR offer, and which peripherals remain active in stop3 mode?

The MC9S08SH32CWLR supports stop3, stop2, wait, and run modes. In stop3 mode - the deepest low-power state - current consumption drops below 1 μA while retaining RAM and register contents. ADC, ACMP, and RTC continue operating; the RTC uses its dedicated 1-kHz on-chip oscillator to generate wake-up events without external components, enabling periodic sensor polling in battery-powered applications.

How is debug and programming performed on the MC9S08SH32CWLR?

Debug and programming of the MC9S08SH32CWLR is performed via a single-wire background debug (BKGD) interface using the BKGD/MS pin. This interface supports in-circuit debugging, flash programming, and breakpoint setting without requiring a full JTAG connector. The on-chip debug module provides two additional hardware breakpoints and an eight-deep FIFO for trace data, enabling efficient development of time-critical firmware for the MC9S08SH32CWLR.

What security features protect firmware and data in the MC9S08SH32CWLR?

The MC9S08SH32CWLR includes on-chip security circuitry that prevents unauthorized access to Flash and RAM contents during debug or runtime. Security is enabled via FLASH protection registers (FPROT/NVPROT); once secured, the BKGD interface cannot read memory or execute commands that expose protected regions. This ensures firmware intellectual property and calibration data remain confidential in deployed MC9S08SH32CWLR systems.