NXP Semiconductors MC9S08AC16CFGE

Overview

MC9S08AC16CFGE from NXP Semiconductors (formerly Freescale) is an 8-bit HCS08 microcontroller featuring a 40-MHz CPU, 16 KB on-chip Flash memory with block protection, 1 KB RAM, and integrated peripherals including dual SCI, SPI, I²C, three 16-bit TPM modules (two 2-channel, one 4-channel), 8-channel 10-bit ADC, and KBI. It targets cost-sensitive industrial control and consumer appliance applications requiring robust debug support and low-power operation.

For engineers reviewing the MC9S08AC16CFGE datasheet, MC9S08AC16CFGE pinout, MC9S08AC16CFGE application, or MC9S08AC16CFGE equivalent, key selection criteria include its 48-pin QFN package, background debugging system with three breakpoints, COP watchdog with independent clock option, LVD reset/interrupt capability, and support for Wait + two Stop modes - all confirmed in Rev. 9 (Aug 2011) datasheet and QFN Addendum (Rev. 0, Jul 2014).

Technical Context

The MC9S08AC16CFGE implements the S08CPUV2 core with HC08 instruction set extension (BGND), 20-MHz bus frequency, and on-chip debug module with eight-deep FIFO, two comparators, and nine trigger modes. Its internal clock generator supports FEI/FEE/FBE/SCM modes with NVM-trimmed precision oscillator and external crystal/resonator options up to 4 MHz.

Peripherals are tightly coupled to the 16-bit address space: dual SCI modules support 13-bit break detection; I²C operates at ≤100 kbps under full bus loading; TPM modules provide edge-aligned and buffered center-aligned PWM across 8 total channels; ADC includes automatic compare function and internal temperature sensor.

Key Specifications

Pinout & Package

MC9S08AC16CFGE is housed in a 48-pin quad flat no-lead (QFN) package per document 98ASA00466D, featuring an exposed thermal pad and 0.5 mm pitch. Pin functions align with MC9S08AC16 series specification (Rev. 9, Aug 2011), with dedicated VDD/VSS pairs, analog supply (VDDAD/VSSAD), reference pins (VREFH/VREFL), and shared peripheral/I/O pins across Ports A–G.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MC9S08AC60CFGE, the MC9S08AC16CFGE trades Flash capacity for lower unit cost and smaller die size, while retaining identical debug, power, and peripheral capabilities. Against S9KEAZ128AMLH, it offers proven 8-bit determinism and lower power in Wait mode but lacks 32-bit compute headroom - making it ideal for stable, volume-sensitive embedded control.

Availability

MC9S08AC16CFGE is available at Aetrix Electronics and suitable for home appliance control, industrial sensor nodes, LED lighting drivers, and automotive body electronics requiring stable component supply and long-lifecycle support.

Supply support for MC9S08AC16CFGE 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 focused on secure connectivity solutions for automotive, industrial, and IoT markets, formed from the acquisition of Freescale Semiconductor in 2015.

The MC9S08AC16CFGE belongs to the HCS08 family - designed specifically for cost-optimized, low-power 8-bit control in appliances, industrial panels, and body electronics where deterministic timing and debug reliability outweigh raw processing power.

FAQ

What is the maximum bus frequency supported by the MC9S08AC16CFGE?

The MC9S08AC16CFGE supports a maximum bus frequency of 20 MHz, derived from its 40-MHz CPU core via a 2:1 divider. This frequency is achievable in FEE mode with a 4-MHz crystal and appropriate ICG register configuration, as verified in Section 8.4.7 and Table A-12 of Rev. 9 datasheet.

Does the MC9S08AC16CFGE support in-circuit debugging without additional hardware?

Yes, the MC9S08AC16CFGE integrates a Background Debug Module (BDM) accessible via the BKGD/MS pin, enabling full in-circuit programming and debugging using only a single-wire interface. No external JTAG emulator or debug header is required - the MC9S08AC16CFGE's BDM supports breakpoint setting, memory inspection, and real-time register monitoring.

What package type and dimensions does the MC9S08AC16CFGE use?

The MC9S08AC16CFGE uses a 48-pin quad flat no-lead (QFN) package with 0.5 mm pitch and an exposed thermal pad, documented under case outline 98ASA00466D. Its footprint measures 7 mm × 7 mm with 0.85 mm height, as specified in Appendix B of the Rev. 9 datasheet and confirmed in the QFN Addendum (Rev. 0, July 2014).

Can the MC9S08AC16CFGE operate from an internal clock source only?

Yes, the MC9S08AC16CFGE can operate in Self-Clocked Mode (SCM) using only its internal trimmed RC oscillator, eliminating the need for external crystals or resonators. This mode delivers ~31.25 kHz bus frequency and is suitable for non-timing-critical applications like basic I/O control or wake-up supervision.

How many I/O pins does the MC9S08AC16CFGE provide, and are they configurable?

The MC9S08AC16CFGE provides up to 38 general-purpose I/O pins across Ports A–G, all software-configurable for pullup enable, slew rate control, and drive strength selection. Each port pin can be individually assigned as input or output, and many share alternate functions with peripherals such as SCI, SPI, TPM, and ADC - detailed in Chapter 6 of the Rev. 9 datasheet.