NXP Semiconductors MC9S08AC16CFGER

Overview

MC9S08AC16CFGER from NXP Semiconductors (formerly Freescale) is an 8-bit HCS08 microcontroller with 16 KB Flash, 1 KB RAM, 48-pin QFN package, 20 MHz bus frequency, and integrated peripherals including dual SCI, SPI, I²C, 8-channel 10-bit ADC, and three 16-bit TPM modules. It targets industrial control panels requiring deterministic real-time response, low-power operation, and on-chip debug support.

For engineers reviewing the MC9S08AC16CFGER datasheet, MC9S08AC16CFGER pinout, MC9S08AC16CFGER application, or MC9S08AC16CFGER equivalent, key selection criteria include Flash security options, COP watchdog independence, QFN thermal performance, and compatibility with legacy HCS08 toolchains and BDM debug interfaces.

Technical Context

The MC9S08AC16CFGER implements the S08CPUV2 core with HC08 instruction set extension (BGND), supporting background debugging via BKGD/MS pin and a dedicated on-chip debug module with two comparators, nine trigger modes, and eight-deep FIFO for flow tracing. Its internal clock generator (S08ICGV4) supports multiple modes - FEI, FEE, FBE - with NVM-trimmed internal reference and external crystal/resonator 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 provide edge-aligned and buffered center-aligned PWM with input capture and output compare on all channels; ADC includes automatic compare and temperature sensor interface.

Key Specifications

Pinout & Package

MC9S08AC16CFGER is housed in a 48-pin QFN (quad flat no-lead) package with exposed thermal pad (98ASA00466D), optimized for compact industrial PCBs and improved thermal dissipation over LQFP alternatives.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MC9S08AC16CFGER, MC9S08AC32CFGER offers scalable Flash without architectural change, while S9KEAZ128AMLH delivers significantly higher compute throughput and resolution at the cost of toolchain migration and layout redesign.

Availability

MC9S08AC16CFGER is available at Aetrix Electronics and suitable for industrial motor controllers, smart sensor nodes, home appliance UI panels, and automated test fixtures requiring stable component supply and long-lifecycle support.

Supply support for MC9S08AC16CFGER 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 HCS08 family - including MC9S08AC16CFGER - was designed for cost-sensitive, real-time embedded control applications demanding high reliability, low power, and robust debug capabilities in harsh environments.

FAQ

What is the maximum bus frequency supported by the MC9S08AC16CFGER?

The MC9S08AC16CFGER supports a maximum bus frequency of 20 MHz, derived from its internal clock generator (ICG) operating in FEI, FEE, or FBE modes. This frequency governs peripheral timing, instruction execution speed, and ADC conversion rate. The core CPU can operate at up to 40 MHz, but the bus clock remains limited to 20 MHz for synchronization across on-chip modules. All timing specifications in the MC9S08AC16CFGER datasheet are validated at this 20 MHz bus rate.

Does the MC9S08AC16CFGER support in-circuit debugging without additional hardware?

Yes, the MC9S08AC16CFGER includes a fully integrated background debug module (BDM) accessible via the single BKGD/MS pin. No external debugger pod is required - standard BDM interfaces (e.g., P&E Multilink, OSJTAG) connect directly to this pin and VDD/VSS for flash programming, breakpoint setting, and real-time register inspection. The MC9S08AC16CFGER debug module supports two hardware breakpoints, trigger-based event capture, and an 8-deep FIFO for flow tracing, enabling comprehensive diagnostics without code modification.

What package type and thermal characteristics does the MC9S08AC16CFGER use?

The MC9S08AC16CFGER uses a 48-pin QFN package (case outline 98ASA00466D) with an exposed thermal pad. This package measures 7 mm × 7 mm × 0.85 mm and features copper wire bonding for improved reliability over earlier gold-wire variants. The exposed pad must be soldered to a thermal plane on the PCB to achieve θ_JA ≈ 42°C/W. Thermal performance is superior to equivalent 48-pin LQFP packages, making the MC9S08AC16CFGER suitable for enclosed industrial enclosures where airflow is limited.

Can the MC9S08AC16CFGER operate from a 3.3 V supply while maintaining full peripheral functionality?

Yes, the MC9S08AC16CFGER operates across a 2.7 V to 5.5 V supply range, and all peripherals - including ADC, SCI, SPI, I²C, and TPM - are fully functional at 3.3 V. The ADC reference can be configured for 3.3 V ratiometric operation using VREFH/VREFL pins, and internal voltage regulators ensure stable core and analog domain operation. At 3.3 V and 20 MHz bus frequency, the MC9S08AC16CFGER meets all AC/DC electrical specifications defined in its datasheet, including propagation delays and setup/hold times.

How is Flash memory protected against unauthorized access in the MC9S08AC16CFGER?

Flash protection in the MC9S08AC16CFGER is implemented via non-volatile security bits (FOPT register) that disable read-out of Flash contents and prevent mass erase when set. Once secured, only a complete chip erase - which clears all Flash and RAM - restores accessibility, and this operation requires the BDM interface with valid security key. The MC9S08AC16CFGER also supports block-level protection (FPROT register) to lock specific Flash regions independently, allowing bootloader code to remain readable while application code stays protected.