NXP Semiconductors MC9S08AC16CFDE

Overview

MC9S08AC16CFDE from NXP Semiconductors (formerly Freescale) is an 8-bit HCS08 microcontroller with 16 KB Flash, 1 KB RAM, 40-MHz CPU, 20-MHz bus frequency, and integrated peripherals including dual SCI, SPI, I²C, three 16-bit TPM modules, 8-channel 10-bit ADC, and KBI - used in industrial control panels and automotive body electronics.

For engineers reviewing the MC9S08AC16CFDE datasheet, MC9S08AC16CFDE pinout, MC9S08AC16CFDE application, or MC9S08AC16CFDE equivalent, key selection criteria include QFN-48 package compatibility, on-chip debug support with breakpoint capability, COP watchdog with independent clock option, low-voltage detect interrupt/reset, and Flash block protection for secure firmware updates.

Technical Context

The MC9S08AC16CFDE implements the S08CPUV2 core with HC08 instruction set extension (BGND), background debugging system (BDM), and eight-deep FIFO for trace data capture. Its internal clock generator supports FEI/FEE/FBE modes with NVM-trimmed precision and external crystal/resonator or clock input.

Peripherals are memory-mapped and synchronized to the 20-MHz bus clock: dual SCI modules support 13-bit break detection; I²C operates up to 100 kbps under full bus loading; TPM modules offer edge-aligned and buffered center-aligned PWM across 8 total channels; ADC includes automatic compare function and internal temperature sensor.

Key Specifications

Pinout & Package

MC9S08AC16CFDE is housed in a 48-pin quad flat no-lead (QFN) package per outline 98ASA00466D, featuring an exposed thermal pad for enhanced heat dissipation and copper-wire interconnects for improved reliability over legacy gold-wire versions.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MC9S08AC16CFDE, MC9S08AC60CFDE offers direct peripheral and pin compatibility with expanded Flash for complex control algorithms, while S9KEAZ128AMLH provides architectural modernization at the cost of software rework and higher BOM cost.

Availability

MC9S08AC16CFDE is available at Aetrix Electronics and suitable for industrial control panels, automotive body electronics, and smart appliance interfaces requiring stable component supply and long-term lifecycle support.

Supply support for MC9S08AC16CFDE 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 MC9S08AC16CFDE belongs to the HCS08 family - designed for cost-sensitive, low-power embedded control applications demanding robust debug capability, Flash security, and mixed-signal integration in compact packages.

FAQ

What is the package type and thermal pad configuration for MC9S08AC16CFDE?

The MC9S08AC16CFDE uses a 48-pin QFN package per mechanical outline 98ASA00466D, featuring an exposed copper thermal pad on the bottom surface. This pad must be soldered to a PCB thermal plane for reliable thermal performance and mechanical stability. The package migrated from gold-wire to copper-wire bonding per Freescale's QFN Addendum Rev. 0 (2014).

Does MC9S08AC16CFDE support in-circuit debugging, and what interface does it use?

Yes, MC9S08AC16CFDE integrates a full 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 trace data. No external debugger hardware is required beyond a standard BDM pod compatible with HCS08 architecture.

What clock sources are supported by MC9S08AC16CFDE, and how is accuracy maintained?

MC9S08AC16CFDE supports crystal, ceramic resonator, external clock, or internally generated clock. Accuracy is maintained via factory-trimmed nonvolatile memory (NVM) values applied to the internal clock generator (ICG), enabling stable bus frequencies (e.g., 20 MHz) even without external timing components. Trim values are stored in ICGTRM register and persist across resets.

Can MC9S08AC16CFDE operate in low-power modes, and which peripherals remain active in Stop2 mode?

Yes, MC9S08AC16CFDE supports Wait, Stop2, and Stop3 modes. In Stop2 mode, the COP watchdog, LVD circuitry, and RTI remain functional while the CPU and bus clocks halt. Peripherals like SCI, SPI, and TPM are disabled unless explicitly configured for asynchronous wake-up - only IRQ pin and selected KBI pins can generate interrupts to exit Stop2.

How is Flash memory protected against unauthorized access or accidental overwrite in MC9S08AC16CFDE?

MC9S08AC16CFDE implements dual-layer Flash protection: block protection via FPROT register prevents erase/write to designated sectors, and security byte programming disables read-out of Flash contents via BDM interface. Once secured, only a chip-erase operation (which clears all Flash and security bits) restores full access - ensuring firmware IP protection and preventing field corruption.