NXP Semiconductors MC9S08AC16MFJE

Overview

MC9S08AC16MFJE 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 - deployed in industrial control panels and consumer appliance mainboards.

For engineers reviewing the MC9S08AC16MFJE datasheet, MC9S08AC16MFJE pinout, MC9S08AC16MFJE application, or MC9S08AC16MFJE 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 MC9S08AC16MFJE implements the S08CPUV2 core with HC08 instruction set extension (BGND), background debugging system with two comparators and nine trigger modes, and eight-deep FIFO for trace data. It supports up to 32 interrupt/reset sources and features a programmable internal clock generator (S08ICGV4) with FLL, FEI/FEE/FBE modes, and NVM-trimmed precision.

Peripherals are tightly coupled to the 20-MHz bus: dual SCI modules support 13-bit break detection; I²C operates at ≤100 kbps under full bus loading; SPI is V3 revision; three TPM modules provide input capture, output compare, edge-aligned PWM, and buffered center-aligned PWM on all channels.

Key Specifications

Pinout & Package

MC9S08AC16MFJE is housed in a 48-pin quad flat no-lead (QFN) package per outline 98ASA00466D, featuring an exposed thermal pad and copper-wire interconnect 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 MC9S08AC16MFJE, MC9S08AC60CFUE offers direct Flash scalability within identical footprint and toolchain, while S9KEAZ128AMLH provides architectural upgrade path with ARM ecosystem support but requires PCB redesign and firmware rearchitecture.

Availability

MC9S08AC16MFJE is available at Aetrix Electronics and suitable for industrial control panels, home appliance mainboards, building automation interfaces, and sensor node designs requiring stable component supply and long-term manufacturability.

Supply support for MC9S08AC16MFJE 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, now specializing in secure connectivity solutions for automotive, industrial, and IoT applications.

The MC9S08AC16MFJE belongs to the HCS08 family - designed for cost-sensitive, low-power 8-bit embedded control in consumer and industrial equipment where Flash security, debug visibility, and mixed-signal integration are critical.

FAQ

What is the package type and thermal pad configuration of the MC9S08AC16MFJE?

The MC9S08AC16MFJE uses a 48-pin QFN package (outline 98ASA00466D) with copper-wire bonding and an exposed thermal pad. This pad must be soldered to a PCB thermal plane for effective heat dissipation and signal integrity - per Freescale EB806 guidelines, it should be connected to VSS with multiple thermal vias.

Does the MC9S08AC16MFJE support in-circuit debugging, and what capabilities does its debug module offer?

Yes, the MC9S08AC16MFJE includes an on-chip background debug module supporting single-wire BKGD/MS interface. It provides breakpoint capability (one active + two in debug module), two hardware comparators, nine trigger modes, and an eight-deep FIFO for storing flow-change addresses - enabling real-time trace without halting execution.

What clock sources are supported by the MC9S08AC16MFJE, and how is internal clock accuracy maintained?

The MC9S08AC16MFJE supports crystal, resonator, external clock, or internally generated clock. Its internal clock generator (S08ICGV4) uses factory-trimmed NVM values to calibrate the FLL, achieving ±2% bus frequency accuracy over voltage and temperature - eliminating need for external crystal in many cost-sensitive applications.

How does the MC9S08AC16MFJE handle low-voltage conditions, and can it generate both reset and interrupt?

The MC9S08AC16MFJE integrates a configurable low-voltage detect (LVD) system with programmable trip points. It can be set to assert either a reset or generate an interrupt - allowing firmware to initiate graceful shutdown, data save, or warning indication before supply collapse, enhancing system robustness in battery-powered or unstable line environments.

Are the Flash memory and security features of the MC9S08AC16MFJE suitable for production firmware deployment?

Yes, the MC9S08AC16MFJE provides 16 KB of in-circuit programmable Flash with block protection and dedicated security byte. Once secured, Flash contents cannot be read or modified externally, and debug access is disabled - making it suitable for production firmware with IP protection requirements in consumer and industrial products.