NXP Semiconductors MC9S08AW16CFUE

Overview

MC9S08AW16CFUE from Freescale Semiconductor is an 8-bit HCS08 microcontroller featuring a 40-MHz CPU core, 16 KB on-chip FLASH memory, 1 KB RAM, and integrated peripherals including dual SCI, SPI, I²C, 16-channel 10-bit ADC, and two 16-bit timer/PWM modules. It operates at up to 20-MHz bus frequency and supports single-wire background debug mode for in-circuit development. It is used in industrial control panels requiring compact, low-power embedded logic with analog sensing and serial communication.

For engineers reviewing the MC9S08AW16CFUE datasheet, MC9S08AW16CFUE pinout, MC9S08AW16CFUE application, or MC9S08AW16CFUE equivalent, key selection criteria include its 48-pin QFN package, copper-wire interconnect migration (98ASA00466D), 16 KB FLASH with block protection, real-time ICE debugging capability, and support for LQFP-44 as a footprint-compatible alternative.

Technical Context

The MC9S08AW16CFUE implements the S08CPUV2 core with HC08 instruction set extension and BGND instruction, enabling single-wire BDM debugging with one hardware breakpoint plus two additional breakpoints via the on-chip debug module. Its internal clock generator (S08ICGV4) supports multiple modes - FEI, FEE, FBE - with NVM-trimmed internal reference and external crystal/resonator options up to 4 MHz.

Peripherals are tightly coupled to the 20-MHz bus: the 10-bit ADC includes automatic compare and temperature sensor input; dual SCI modules support 13-bit break detection; and the TPM modules provide edge-aligned and centered PWM with buffered outputs. All I/O ports support software-selectable pullups, slew rate, and drive strength - critical for noise-immune industrial interfacing.

Key Specifications

Pinout & Package

The MC9S08AW16CFUE is housed in a 48-pin low-profile quad flat no-lead (QFN) package with exposed thermal pad (case outline 98ASA00466D), migrated from gold to copper wire bonding per Freescale QFN Addendum Rev. 0 (July 2014). The package supports automated optical inspection and provides enhanced thermal dissipation for industrial ambient operation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MC9S08AW16CFUE, the MC9S08AW32CFUE offers direct footprint compatibility and scalable FLASH while preserving all timing-critical peripherals; the MC9S08QG8CDT requires board layout changes and sacrifices ADC resolution, PWM flexibility, and debug capability - making it suitable only for legacy cost-down, not functional equivalence.

Availability

MC9S08AW16CFUE is available at Aetrix Electronics and suitable for industrial motor control, smart sensor nodes, programmable logic relays, and industrial HMI panels requiring stable component supply across extended temperature ranges (–40°C to +105°C) and long production lifecycles.

Supply support for MC9S08AW16CFUE 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

Freescale Semiconductor (now part of NXP Semiconductors since 2015) designed high-reliability microcontrollers for automotive, industrial, and consumer applications with emphasis on integration, debug capability, and longevity.

The MC9S08AW16CFUE belongs to the HCS08 AW-series - engineered for cost-sensitive industrial control systems needing robust analog integration, deterministic real-time response, and field-programmable FLASH in compact QFN/LQFP packages.

FAQ

What is the maximum bus frequency supported by the MC9S08AW16CFUE?

The MC9S08AW16CFUE supports a maximum internal bus frequency of 20 MHz. This is derived from its 40-MHz CPU core operating in a 2:1 divide configuration. The bus frequency directly governs peripheral timing - including ADC conversion rates, SCI baud generation, and TPM counter increments - and must be configured via the Internal Clock Generator (ICG) registers (ICGC1/ICGC2) using either internal trimmed reference or external crystal sources.

Does the MC9S08AW16CFUE support in-circuit programming after soldering?

Yes, the MC9S08AW16CFUE supports full in-circuit programming via its single-wire background debug mode (BDM) interface using the BKGD/MS pin. No external programming hardware beyond a BDM pod is required. FLASH memory can be erased and reprogrammed in-system with standard Freescale Codewarrior or open-source OSBDM tools, enabling field firmware updates and manufacturing calibration without device removal.

What are the thermal pad requirements for the MC9S08AW16CFUE's QFN package?

The MC9S08AW16CFUE uses a 48-pin QFN package (98ASA00466D) with an exposed thermal pad. Per Freescale EB806 guidelines, the pad must be soldered to a minimum 10 mm² copper pour connected to VSS for thermal conduction and electrical stability. Staggered thermal vias (≥4×0.3 mm diameter) beneath the pad are recommended to enhance heat transfer to inner ground planes, especially in industrial environments operating continuously at 85°C ambient.

Can the MC9S08AW16CFUE operate from a 3.3 V supply while maintaining full peripheral functionality?

Yes, the MC9S08AW16CFUE operates across a 2.7–5.5 V supply range. At 3.3 V, all peripherals - including the 10-bit ADC (with VREFH = VDD), dual SCI, SPI, I²C, and TPM modules - function per specification. However, maximum CPU frequency is reduced to ~32 MHz (vs. 40 MHz at 5 V), and bus frequency remains capped at 20 MHz. Electrical characteristics such as IOL/IOH and ADC INL remain within datasheet limits at 3.3 V.

Is there hardware support for CRC calculation in the MC9S08AW16CFUE?

No, the MC9S08AW16CFUE does not include a dedicated hardware CRC module. CRC-16 or CRC-32 calculations must be implemented in firmware using standard polynomial algorithms (e.g., CRC-16-CCITT). The S08CPUV2 core's efficient bit-manipulation instructions and zero-overhead loops help minimize execution time, but no register-level CRC acceleration is provided - unlike later S12Z or Kinetis families.