NXP Semiconductors MC9S08SE8CWLR

Overview

MC9S08SE8CWLR from NXP Semiconductors (formerly Freescale) is an 8-bit HCS08 microcontroller with 8 KB flash, 512 bytes RAM, 20 MHz CPU, 10 MHz bus frequency, and integrated peripherals including SCI, 10-channel 10-bit ADC, dual TPM timers, KBI, and RTC - deployed in industrial sensor nodes and automotive body control modules.

For engineers reviewing the MC9S08SE8CWLR datasheet, MC9S08SE8CWLR pinout, MC9S08SE8CWLR application, or MC9S08SE8CWLR equivalent, key selection criteria include its 28-pin SOIC package, ICS/FLL-based clock flexibility (1–10 MHz bus), stop-mode current as low as 1.4 µA, LIN-capable SCI interface, and on-chip temperature sensor with 1.7 mV/°C sensitivity.

Technical Context

The MC9S08SE8CWLR implements the HCS08 CPU core with HC08 instruction set extension (BGND), supporting up to 32 interrupt/reset sources and single-wire background debug. Its internal clock source (ICS) uses a frequency-locked loop (FLL) with factory-trimmed 39.0625 kHz reference, enabling ±0.2% resolution and ±2% deviation over voltage/temperature.

Peripherals are tightly coupled to the 10 MHz bus: the 10-bit ADC achieves 2.5 µs conversion time and operates in Stop3 mode; TPM1 (2-channel) and TPM2 (1-channel) support edge-aligned PWM, input capture, and buffered centered PWM; SCI supports LIN master break generation and slave break detection with wakeup capability.

Key Specifications

Pinout & Package

MC9S08SE8CWLR is packaged in a 28-pin SOIC (Case 751F), with 24 functional I/O pins across Ports A, B, and C, plus dedicated power, reset, and debug pins. Pin functions are software-configurable for pullup, slew rate, and drive strength.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MC9S08AW60CFUE and S9KEAZ128AMLH, the MC9S08SE8CWLR delivers optimal cost-efficiency and ultra-low-power operation for fixed-function embedded control where 8 KB flash and LIN/SCI suffice - avoiding over-specification while maintaining industrial temperature range and proven field reliability.

Availability

MC9S08SE8CWLR is available at Aetrix Electronics and suitable for automotive body electronics, industrial sensor nodes, smart appliance controllers, and medical front-end modules requiring stable component supply and long-term lifecycle support.

Supply support for MC9S08SE8CWLR 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 specializing in secure connectivity solutions for automotive, industrial, and IoT applications.

The MC9S08SE8CWLR belongs to the legacy HCS08 microcontroller family, designed for cost-sensitive, low-power embedded control in harsh environments - emphasizing robustness, debug simplicity, and minimal external component count.

FAQ

What is the maximum bus frequency supported by the MC9S08SE8CWLR?

The MC9S08SE8CWLR supports a maximum bus frequency of 10 MHz, derived from its 20 MHz CPU clock via a 2:1 divider. This frequency governs all peripheral timing, including ADC sampling rate, SCI baud generation, and TPM counter increments. Operation above 10 MHz bus violates the device specification and may cause timing violations or data corruption.

Does the MC9S08SE8CWLR support LIN communication natively?

Yes, the MC9S08SE8CWLR's SCI module supports LIN 2.0 functionality natively: it can generate extended break fields as a LIN master and detect them as a LIN slave. This is implemented in hardware without CPU intervention, enabling deterministic frame timing and low-overhead protocol handling - confirmed in Section "Peripherals" of the Rev. 4 datasheet.

What is the lowest power consumption mode available on the MC9S08SE8CWLR?

The MC9S08SE8CWLR achieves its lowest active power state in Stop3 mode, drawing as little as 1.4 µA at 5 V and –40 to 85 °C. In this mode, the CPU, bus, and most peripherals are halted, yet the RTC remains operational and the ADC can be configured for wakeup-triggered conversions - making it ideal for battery-powered sensing applications.

Can the MC9S08SE8CWLR operate without an external crystal?

Yes, the MC9S08SE8CWLR can operate without an external crystal by using its Internal Clock Source (ICS) with Frequency-Locked Loop (FLL). The factory-trimmed internal reference enables bus frequencies from 1 MHz to 10 MHz, with ±0.2% resolution at fixed conditions - sufficient for non-precision timing applications like motor control or sensor polling.

What package type is used for the MC9S08SE8CWLR part number?

The MC9S08SE8CWLR is supplied in a 28-pin SOIC package (Case 751F), as explicitly defined in the "Package Options" section of the MC9S08SE8 Rev. 4 datasheet. This surface-mount package offers mechanical robustness and thermal performance suitable for industrial and automotive PCB assemblies.