NXP Semiconductors MC9S08AC16CFJE

Overview

MC9S08AC16CFJE from NXP Semiconductors (formerly Freescale) is an 8-bit HCS08 microcontroller with 16 KB Flash, 1 KB RAM, 40-MHz CPU, 3× 16-bit TPM timers, 8-channel 10-bit ADC, dual SCI, SPI, I²C, and up to 38 GPIO - designed for industrial control and consumer appliance mainboard applications.

For engineers reviewing the MC9S08AC16CFJE datasheet, MC9S08AC16CFJE pinout, MC9S08AC16CFJE application, or MC9S08AC16CFJE equivalent, key selection criteria include QFN-48 package compatibility, on-chip debug support with breakpoint FIFO, COP watchdog with independent clock source, low-voltage detect interrupt capability, and Flash block protection for firmware security in cost-sensitive embedded systems.

Technical Context

The MC9S08AC16CFJE implements the HCS08 CPU core with HC08 instruction set extension (including BGND), supports up to 32 interrupt/reset sources, and integrates a background debug module with two comparators, nine trigger modes, and eight-deep FIFO for flow tracing. Its internal clock generator offers FEI/FEE/FBE modes with NVM-trimmed precision and supports crystal, resonator, or external clock inputs.

Peripherals include three 16-bit timer/pulse-width modulator (TPM) modules - two 2-channel and one 4-channel - each supporting input capture, output compare, edge-aligned PWM, and buffered center-aligned PWM. The ADC features automatic compare function and internal temperature sensor, while dual SCI modules support optional 13-bit break detection.

Key Specifications

Pinout & Package

MC9S08AC16CFJE 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 per Freescale QFN migration addendum (Rev. 0, 07/2014).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MC9S08AC16CFJE, MC9S08AC60CFJE delivers greater Flash headroom within identical hardware constraints, while S9KEAZ128AMLH represents a platform-level upgrade path with higher performance at the cost of redesign effort and toolchain migration.

Availability

MC9S08AC16CFJE is available at Aetrix Electronics and suitable for home appliance control, industrial sensor nodes, and smart power outlet applications requiring stable component supply, long-lifecycle support, and automotive-grade reliability validation.

Supply support for MC9S08AC16CFJE 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 MC9S08AC16CFJE belongs to the HCS08 family - designed specifically for cost-sensitive, low-power embedded control applications in consumer and industrial equipment where deterministic real-time response and debuggability are essential.

FAQ

What is the package type and thermal pad configuration of MC9S08AC16CFJE?

The MC9S08AC16CFJE uses a 48-pin QFN package (outline 98ASA00466D) with an exposed thermal pad. This copper-wire-bonded variant replaces earlier gold-wire versions per Freescale's QFN migration addendum (Rev. 0, 07/2014). The thermal pad must be soldered to a PCB copper pour for effective heat dissipation and electrical grounding, as specified in EB806 application note.

Does MC9S08AC16CFJE support in-circuit debugging, and what interface does it use?

Yes, MC9S08AC16CFJE includes an integrated background debug module (BDM) accessible via the BKGD/MS pin. It supports single breakpoint setting during runtime, two additional breakpoints in the debug module, and eight-deep FIFO for storing flow-change addresses. No external debugger hardware is required beyond a standard BDM interface cable, and the MC9S08AC16CFJE debug system operates independently of the main application code execution.

What clock sources are supported by MC9S08AC16CFJE, and how is frequency accuracy maintained?

MC9S08AC16CFJE supports crystal, ceramic resonator, external clock, and internally generated clock sources. Frequency accuracy is maintained through factory-trimmed non-volatile memory (NVM) values used by the internal clock generator (ICG), enabling stable bus frequencies such as 20 MHz even without external crystals. Trim values can be adjusted in-system for fine-tuning across voltage and temperature variations, as documented in the ICGTRM register section of the datasheet.

How many I/O pins does MC9S08AC16CFJE provide, and what configurability options are available?

MC9S08AC16CFJE provides up to 38 general-purpose I/O pins across Ports A–G. Each pin supports software-selectable internal pullups (reducing external resistor count), slew rate control (to minimize EMI during fast transitions), and drive strength selection (for optimizing noise immunity vs. power consumption). Pin behavior in Stop modes is individually configurable, allowing selective wake-up capability on specific inputs without full system restart.

Is MC9S08AC16CFJE qualified for automotive applications, and what is its industrial temperature grade?

No, MC9S08AC16CFJE is rated for industrial temperature range (–40°C to +85°C) and belongs to the AC series intended for consumer and industrial applications. Automotive-qualified variants - such as the MC9S08AW16A - share the same core architecture but undergo additional AEC-Q100 stress testing and offer extended temperature range (–40°C to +125°C). For automotive use, MC9S08AC16CFJE must be validated separately per OEM requirements and is not pre-qualified.