NXP Semiconductors MC9S08AC8MFDE

Overview

MC9S08AC8MFDE from NXP Semiconductors (formerly Freescale) is an 8-bit HCS08 microcontroller with 8 KB flash, 512 B RAM, 40-MHz CPU, and integrated peripherals including dual SCI, SPI, I²C, three 16-bit TPM modules, 8-channel 10-bit ADC, and KBI - designed for cost-sensitive industrial control and consumer appliance applications.

For engineers reviewing the MC9S08AC8MFDE datasheet, MC9S08AC8MFDE pinout, MC9S08AC8MFDE application, or MC9S08AC8MFDE equivalent, key selection considerations include its QFN-48 package, copper-wire interconnect migration (98ASA00466D), 20-MHz bus frequency, on-chip debug module with FIFO trace, and support for Wait/Stop2/Stop3 low-power modes in embedded sensor and actuator control systems.

Technical Context

The MC9S08AC8MFDE implements the S08CPUV2 core with HC08 instruction set extension (BGND), background debugging system (BDM), and eight-deep FIFO for change-of-flow address capture. Its internal clock generator supports FEI/FEE/FBE modes with NVM-trimmed oscillator and optional external crystal (32 kHz to 4 MHz).

Peripherals are memory-mapped and share a unified 20-MHz bus: two SCIs support 13-bit break detection; SPI operates in master/slave mode; I²C complies with standard-mode (100 kbps) timing; three TPM modules provide input capture, output compare, edge-aligned PWM, and buffered center-aligned PWM across up to 8 channels.

Key Specifications

Pinout & Package

MC9S08AC8MFDE is housed in a 48-pin 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). Pin assignments follow the MC9S08AC16 Series Data Sheet Rev. 9 (August 2011), Section 2.2.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MC9S08AC8MFDE, MC9S08AC16MFDE offers double flash capacity in identical QFN-48 packaging for seamless firmware scalability, while S9KEAZ128AMLH provides ARM-based performance, larger memory, and modern peripherals - requiring PCB redesign but enabling long-term roadmap alignment.

Availability

MC9S08AC8MFDE is available at Aetrix Electronics and suitable for home appliance control, industrial sensor nodes, smart lighting dimmers, and automated HVAC actuators requiring stable component supply across extended production cycles.

Supply support for MC9S08AC8MFDE 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 company formed from the spin-off of Philips' semiconductor division, specializing in secure connectivity solutions for automotive, industrial, and IoT markets.

The MC9S08AC8MFDE belongs to the HCS08 microcontroller family, engineered for cost-effective, low-power embedded control in consumer and industrial applications where deterministic real-time response and debuggability are essential.

FAQ

What is the package type and lead count for MC9S08AC8MFDE?

The MC9S08AC8MFDE uses a 48-pin quad flat no-lead (QFN) package with exposed thermal pad, documented under case outline number 98ASA00466D per Freescale's QFN Addendum Rev. 0 (July 2014). This copper-wire bonded variant replaces earlier gold-wire versions and is mechanically and electrically compatible with the MC9S08AC16 series footprint.

Does MC9S08AC8MFDE support background debugging, and what interface does it use?

Yes, MC9S08AC8MFDE includes an on-chip background debugging system (BDM) accessed via the BKGD/MS pin. It supports single breakpoint setting, two additional breakpoints in the debug module, and eight-deep FIFO trace for change-of-flow addresses - enabling non-intrusive in-circuit debugging without dedicated JTAG hardware.

What are the supported low-power modes for MC9S08AC8MFDE, and how do they differ?

MC9S08AC8MFDE supports Wait, Stop2, and Stop3 modes. Wait halts the CPU while peripherals remain active; Stop2 disables the bus clock and most peripherals but retains RAM and allows wake-up via IRQ or KBI; Stop3 shuts down nearly all clocks and logic except the LVD and COP circuits, achieving sub-1 µA current draw - ideal for battery-powered sensor nodes.

Can MC9S08AC8MFDE operate without an external crystal, and what clock options are available?

Yes, MC9S08AC8MFDE can operate without an external crystal using its internal clock generator (ICG) in FEI or FLL-engaged internal modes. Supported sources include external clock, crystal (32 kHz–4 MHz), ceramic resonator, or internally trimmed RC oscillator - with bus frequencies up to 20 MHz and CPU up to 40 MHz.

How many ADC channels does MC9S08AC8MFDE have, and what resolution is supported?

MC9S08AC8MFDE integrates an 8-channel, 10-bit successive-approximation analog-to-digital converter (ADC) with automatic compare function and internal temperature sensor. Each channel supports software-triggered or timer-triggered conversions, and the ADC operates independently of CPU activity - allowing concurrent processing and measurement.