NXP Semiconductors MC9S08SE4CWL

Overview

MC9S08SE4CWL from NXP Semiconductors (formerly Freescale) is an 8-bit HCS08 microcontroller designed for cost-sensitive embedded control applications. It features a 20 MHz CPU, 4 KB on-chip flash memory, 256 bytes RAM, 10-bit ADC with temperature sensor, SCI interface, two TPM modules, and real-time counter. It operates across –40°C to 85°C in 28-pin SOIC package and is used in industrial sensors, appliance control panels, and low-power metering systems.

For engineers reviewing the MC9S08SE4CWL datasheet, MC9S08SE4CWL pinout, MC9S08SE4CWL application, or MC9S08SE4CWL equivalent, key selection criteria include its 4 KB flash / 256 B RAM memory configuration, 10-bit ADC with 2.5 μs conversion time and internal bandgap reference, ICS clock source supporting 1–10 MHz bus frequencies, low-power Stop2/Stop3 modes down to 1.4 μA, and single-wire background debug interface.

Technical Context

The MC9S08SE4CWL implements the HCS08 CPU core with HC08 instruction set extension (including BGND), supporting up to 32 interrupt/reset sources. Its internal clock source (ICS) integrates a frequency-locked loop (FLL) with factory-trimmed 39.0625 kHz internal reference and user-trimmable range of 31.25–39.06 kHz, enabling precise bus frequencies from 1 MHz to 10 MHz without external crystal.

Peripherals include a full-duplex SCI with LIN master/slave extended break support, a 10-channel 10-bit ADC with automatic compare, temperature sensing (1.7 mV/°C), and operation in Stop3 mode, plus two timer/pulse-width modulator modules (TPM1: 2-channel, TPM2: 1-channel) with input capture, output compare, and edge-aligned PWM capability - all configurable via software-controlled port drive strength and slew rate.

Key Specifications

Pinout & Package

MC9S08SE4CWL is housed in a 28-pin SOIC package (Case 751F), with pin assignments identical to the MC9S08SE8 series per Freescale Document MC9S08SE8 Rev. 4. All pins support software-selectable pullups, slew rate, and drive strength.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MC9S08SE8CWL, the MC9S08SE4CWL trades memory capacity for lower cost and same footprint; versus S9S08SG48E1MTJR, it offers proven SOIC integration and minimal BOM change but lacks SPI/I²C - making it optimal for legacy-replacement or cost-optimized control nodes.

Availability

MC9S08SE4CWL is available at Aetrix Electronics and suitable for industrial sensor nodes, home appliance control panels, and smart energy meter interfaces requiring stable component supply and long-term manufacturability.

Supply support for MC9S08SE4CWL 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 delivering secure, scalable solutions for automotive, industrial, IoT, and mobile applications.

The MC9S08SE4CWL belongs to the HCS08-based SE-series microcontrollers, engineered for cost-effective, low-power embedded control in appliances, industrial equipment, and metering - emphasizing integration, debug simplicity, and robust operation across extended temperature ranges.

FAQ

What is the maximum operating frequency of the MC9S08SE4CWL CPU core?

The MC9S08SE4CWL CPU core runs at a maximum frequency of 20 MHz. This allows execution of complex control algorithms while maintaining deterministic timing for real-time tasks. The internal bus frequency is limited to 10 MHz, and the device supports both crystal-based (XOSC) and internal clock source (ICS) configurations to achieve this performance reliably across its –40°C to 85°C operating range.

Does the MC9S08SE4CWL include an integrated temperature sensor?

Yes, the MC9S08SE4CWL includes an integrated temperature sensor with a sensitivity of 1.7 mV/°C. This sensor is accessible through the ADC subsystem and does not require external components. It is factory-calibrated and operates in all active and Stop3 modes, enabling reliable thermal monitoring in battery-powered or sealed industrial enclosures without adding BOM cost or board space.

What debug interface does the MC9S08SE4CWL support?

The MC9S08SE4CWL supports a single-wire background debug (BDC) interface via the PTA4/BKGD pin. This interface enables non-intrusive in-circuit debugging, breakpoint setting, and flash programming using minimal hardware resources. Unlike JTAG or SWD, it requires only one dedicated pin and no external debug probe - simplifying design and reducing system cost for space-constrained applications.

Can the MC9S08SE4CWL operate without an external crystal?

Yes, the MC9S08SE4CWL can operate without an external crystal using its Internal Clock Source (ICS) module. The ICS includes a frequency-locked loop (FLL) driven by a factory-trimmed internal reference (39.0625 kHz), supporting bus frequencies from 1 MHz to 10 MHz. This eliminates crystal cost and layout complexity while maintaining ±2% accuracy over temperature and voltage - ideal for cost-sensitive consumer and industrial control designs.

What low-power modes are available on the MC9S08SE4CWL?

The MC9S08SE4CWL supports Wait mode plus two Stop modes: Stop2 and Stop3. Stop2 draws as little as 1.4 μA (typical), while Stop3 consumes ≤76.1 μA (max at 125°C) and retains RAM and RTC operation. Both Stop modes support wake-up via external interrupt, SCI activity, or RTC alarm - enabling ultra-low-power operation in battery-backed or energy-harvested systems without sacrificing responsiveness.