NXP Semiconductors MC9S08AW48CFDE

Overview

MC9S08AW48CFDE from Freescale Semiconductor is an 8-bit HCS08 microcontroller featuring a 40-MHz CPU, 48 KB on-chip FLASH memory, 2 KB RAM, and integrated peripherals including dual SCI, SPI, I²C, two 16-bit TPM modules (1×2-channel + 1×6-channel), 10-bit 16-channel ADC, and KBI - deployed in automotive body control modules and industrial sensor nodes.

For engineers reviewing the MC9S08AW48CFDE datasheet, MC9S08AW48CFDE pinout, MC9S08AW48CFDE application, or MC9S08AW48CFDE equivalent, key selection criteria include QFN-48 package compatibility, 20-MHz bus frequency requirement, single-wire BDM debug support, COP watchdog with configurable timeout, and VDDAD/VSSAD analog domain isolation for mixed-signal stability.

Technical Context

The MC9S08AW48CFDE implements the S08CPUV2 core with HC08 instruction set extension (BGND), supporting real-time in-circuit emulation via on-chip ICE with nine trigger modes and bus capture buffer. Its internal clock generator (S08ICGV4) supports FEI/FEE/FBE modes with NVM-trimmed internal reference and external crystal/resonator input up to 32 MHz.

Peripherals are mapped to dedicated ports: Port A–G provide up to 54 GPIOs with software-selectable pullups, slew rate, and drive strength; ADC uses separate VREFH/VREFL pins and supports automatic compare; dual SCI modules each support 13-bit break detection and asynchronous framing.

Key Specifications

Pinout & Package

MC9S08AW48CFDE is housed in a 48-pin QFN package (98ASA00466D) with exposed thermal pad, copper-wire interconnect, and 0.5 mm pitch - optimized for compact automotive and industrial PCB layouts requiring low-inductance ground paths and thermal dissipation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MC9S08AW48CFDE, MC9S08AW60CFDE offers direct memory scalability within identical hardware footprint, while S9KEAZ128AMLH delivers architectural modernization at the cost of redesign effort - making the former ideal for incremental firmware expansion and the latter suited for next-generation platform development.

Availability

MC9S08AW48CFDE is available at Aetrix Electronics and suitable for automotive body electronics, industrial sensor nodes, and smart lighting systems requiring stable component supply, long-term lifecycle assurance, and qualified sourcing for production ramp.

Supply support for MC9S08AW48CFDE 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) was a leading designer of embedded processors, analog, and connectivity solutions for automotive, industrial, and consumer markets.

The HCS08 family - including MC9S08AW48CFDE - was engineered for cost-sensitive, real-time control applications demanding robust debug, mixed-signal integration, and automotive-grade reliability without 32-bit complexity.

FAQ

What is the maximum operating frequency of the MC9S08AW48CFDE CPU core?

The MC9S08AW48CFDE CPU core operates at a maximum frequency of 40 MHz. This is the core instruction execution speed; the internal bus frequency is limited to 20 MHz, which governs peripheral timing, timer clock sources, and communication module baud rates. The bus frequency is derived from the core clock via a configurable divider and remains fixed at half the core frequency in all supported clock modes.

Does the MC9S08AW48CFDE support in-circuit debugging, and what interface does it use?

Yes, the MC9S08AW48CFDE supports real-time in-circuit debugging via a single-wire Background Debug Mode (BDM) interface using the BKGD/MS pin. It includes breakpoint capability (one active breakpoint plus two more in the on-chip debug module), on-chip ICE with bus capture buffer, and full register visibility - eliminating the need for external emulators or JTAG headers during development and field updates.

What are the power supply requirements for the MC9S08AW48CFDE analog and digital domains?

The MC9S08AW48CFDE requires separate power domains: VDD (2.7–5.5 V) for digital logic and VDDAD (2.7–5.5 V) for the analog subsystem, including the ADC and internal bandgap reference. VSS and VSSAD must be connected to system ground with low-impedance paths - ideally star-connected near the device - to prevent digital noise from degrading ADC accuracy or reference stability.

Can the MC9S08AW48CFDE operate without an external crystal, and what clock options are available?

Yes, the MC9S08AW48CFDE can operate without an external crystal using its internally trimmed RC oscillator in Self-Clocked Mode (SCM) or FLL Engaged Internal (FEI) mode. Valid clock sources include external crystal/resonator (32 kHz–32 MHz), external clock signal, or internal reference - all managed by the S08ICGV4 clock generator with NVM-based trimming for ±2% accuracy across voltage and temperature.

How many interrupt sources does the MC9S08AW48CFDE support, and are they prioritized?

The MC9S08AW48CFDE supports up to 32 interrupt/reset sources, including peripheral interrupts (SCI, SPI, I²C, TPM, ADC, KBI), internal exceptions (COP timeout, illegal opcode), and external pins (IRQ, RESET). Interrupts are prioritized in hardware with fixed vector addresses; priority order is determined by vector number (lower address = higher priority), and nested interrupts are enabled via CCR bit 2 (I-bit) control in the condition code register.