NXP Semiconductors MC9S08AC8CFDE

Overview

MC9S08AC8CFDE 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, 10-bit ADC, and three 16-bit TPM timer modules. It targets cost-sensitive industrial control and consumer appliance applications requiring reliable on-chip debug and low-power operation.

For engineers reviewing the MC9S08AC8CFDE datasheet, MC9S08AC8CFDE pinout, MC9S08AC8CFDE application, or MC9S08AC8CFDE equivalent, this page delivers verified package mapping (32-pin QFN), confirmed peripheral register compatibility, real-world power mode behavior (Wait + Stop2/Stop3), and validated alternative options for migration or second sourcing.

Technical Context

The MC9S08AC8CFDE implements the S08CPUV2 core with HC08 instruction set extension (BGND), background debugging system (BDM), and up to 32 interrupt/reset sources. Its internal clock generator supports FEI/FEE/FBE modes with NVM-trimmed precision, enabling stable 20-MHz bus frequency from internal or external sources.

Peripherals include two independent SCI modules (13-bit break support), a single SPI module (V3), I²C bus controller (100 kbps standard-mode), and three 16-bit TPM modules - two with 2 channels and one with 4 channels - all supporting input capture, output compare, edge-aligned PWM, and buffered center-aligned PWM (CPWM).

Key Specifications

Pinout & Package

MC9S08AC8CFDE is housed in a 32-pin QFN package (98ASA00473D) with exposed thermal pad, copper-wire interconnect, and 0.5 mm pitch. This package supports automated reflow assembly and enhanced thermal dissipation in space-constrained designs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MC9S08AC8CFDE, MC9S08AC16CFDE provides double flash and RAM in identical packaging for seamless firmware scaling, while S9KEAZ8AMTJ offers modern ARM architecture at the cost of toolchain and software rework - making the former ideal for incremental upgrades and the latter for greenfield projects demanding roadmap assurance.

Availability

MC9S08AC8CFDE is available at Aetrix Electronics and suitable for industrial automation, home appliance control, and smart lighting applications requiring stable component supply across extended production lifecycles.

Supply support for MC9S08AC8CFDE 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 communication infrastructure markets.

The MC9S08AC8CFDE belongs to the HCS08 family - designed specifically for cost-optimized, low-power embedded control in consumer and industrial applications where deterministic real-time response and debug reliability are essential.

FAQ

What is the package type and pin count of the MC9S08AC8CFDE?

The MC9S08AC8CFDE uses a 32-pin QFN package (document number 98ASA00473D) with an exposed thermal pad and 0.5 mm pitch. This copper-wire QFN variant replaces earlier gold-wire versions and is optimized for automated assembly and thermal performance in compact PCB layouts. The MC9S08AC8CFDE pinout supports full peripheral functionality including dual SCI, SPI, I²C, ADC, and three TPM modules within this footprint.

Does the MC9S08AC8CFDE support in-circuit debugging, and how is it implemented?

Yes, the MC9S08AC8CFDE integrates a Background Debug Module (BDM) accessible via the BKGD/MS pin. It supports single breakpoint setting during active debugging plus two additional breakpoints in the on-chip debug module, along with an eight-deep FIFO for storing flow-change addresses. The MC9S08AC8CFDE requires no external debugger hardware beyond a simple BDM interface cable, enabling real-time inspection and flash programming without halting time-critical operations.

What are the power management capabilities of the MC9S08AC8CFDE?

The MC9S08AC8CFDE supports Wait mode and two Stop modes (Stop2 and Stop3). In Stop3, typical current consumption is below 1 µA, with wake-up possible via IRQ, RTC, or LVD events. The COP watchdog can operate from an independent internal clock source during Stop modes, ensuring fail-safe recovery. These features make the MC9S08AC8CFDE suitable for battery-powered applications where duty-cycled operation and ultra-low standby power are mandatory design requirements.

Can the MC9S08AC8CFDE operate without an external crystal or resonator?

Yes, the MC9S08AC8CFDE can operate using its internally generated clock with factory-trimmed NVM values, achieving stable 20-MHz bus frequency without external timing components. The internal clock generator supports FEI (FLL Engaged Internal) mode for crystal-free startup and operation, reducing BOM cost and board space. External crystals (32 kHz–4 MHz) or resonators remain supported for higher precision timing when required by the application.

What is the maximum ADC resolution and channel count supported by the MC9S08AC8CFDE?

The MC9S08AC8CFDE integrates an 8-channel, 10-bit successive-approximation ADC with automatic compare function and programmable sample time. It supports both single-ended and differential input configurations, with conversion times as low as 4 µs per sample. The MC9S08AC8CFDE ADC includes dedicated VREFH/VREFL pins for external reference selection and shares analog input pins with Port A and Port B, enabling flexible sensor interface design without external multiplexers.