NXP Semiconductors MC9S08AC8CFGE

Overview

MC9S08AC8CFGE from NXP Semiconductors (formerly Freescale) is an 8-bit HCS08 microcontroller featuring a 40-MHz CPU, 20-MHz bus frequency, 8 KB on-chip FLASH, 512 B RAM, and integrated peripherals including dual SCI, SPI, I²C, three 16-bit TPM modules, 8-channel 10-bit ADC, and KBI - designed for cost-sensitive industrial control and consumer appliance applications.

For engineers reviewing the MC9S08AC8CFGE datasheet, MC9S08AC8CFGE pinout, MC9S08AC8CFGE application, or MC9S08AC8CFGE equivalent, key selection criteria include its QFN-32 package with exposed thermal pad, internal clock generator with NVM trimming, background debug support with FIFO trace, COP watchdog with independent clock option, and LVD reset/interrupt capability under 2.7 V.

Technical Context

The MC9S08AC8CFGE implements the S08CPUV2 core with HC08 instruction set extension (BGND), supporting single-breakpoint debugging and a 9-trigger-mode debug module with 8-deep FIFO for flow-event capture. Its internal clock generator (S08ICGV4) supports FEI, FEE, FBE, and SCM modes, with precision NVM trimming enabling stable 20 MHz bus operation from internal reference or external crystal.

Peripherals are tightly coupled to the 20 MHz bus: dual SCI modules support 13-bit break detection; SPI operates in master/slave mode with programmable baud rate; I²C complies with standard-mode (100 kbps) timing; three TPM modules provide up to 8 PWM channels with edge-aligned or buffered center-aligned output; and the 10-bit ADC includes automatic compare and temperature sensor interface.

Key Specifications

Pinout & Package

MC9S08AC8CFGE is housed in a 32-pin QFN package (98ASA00473D) with 5 mm × 5 mm body, 0.5 mm pitch, and exposed thermal pad for enhanced thermal dissipation in compact industrial modules.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MC9S08AC8CFGE, MC9S08AC16CFGE offers double FLASH/RAM for feature-rich firmware, while S9KEAZ8AMLH delivers ARM ecosystem advantages and higher throughput - both require minor register-level adaptation but share identical pinout and thermal footprint.

Availability

MC9S08AC8CFGE is available at Aetrix Electronics and suitable for home appliance control, industrial sensor nodes, smart power outlets, and LED lighting controllers requiring stable component supply across multi-year production cycles.

Supply support for MC9S08AC8CFGE 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, IoT, and mobile applications, formed from the spin-off of Philips' semiconductor division and later acquiring Freescale in 2015.

The HCS08 family - including MC9S08AC8CFGE - was designed for cost-optimized, low-power embedded control in appliances, power tools, and industrial panels, emphasizing debug capability, mixed-signal integration, and long-term manufacturability.

FAQ

What is the maximum operating frequency of the MC9S08AC8CFGE CPU core?

The MC9S08AC8CFGE CPU core supports a maximum execution frequency of 40 MHz. This allows high-speed instruction processing while maintaining compatibility with the 20 MHz bus frequency used by peripherals. The MC9S08AC8CFGE achieves this via internal clock multiplication and precise NVM trimming of its internal oscillator, eliminating dependency on external high-frequency crystals in many applications.

Does the MC9S08AC8CFGE support in-circuit debugging without external hardware?

Yes, the MC9S08AC8CFGE integrates a full Background Debug Module (BDM) accessible through the BKGD/MS pin. This enables single-wire in-circuit debugging, breakpoint setting, memory inspection, and flash programming directly via standard BDM interfaces - no external JTAG emulator or debug probe is required for basic development and field firmware updates.

What are the supported clock sources for the MC9S08AC8CFGE internal clock generator?

The MC9S08AC8CFGE internal clock generator supports four primary modes: FEI (FLL Engaged Internal), FEE (FLL Engaged External), FBE (FLL Bypassed External), and SCM (Self-Clocked Mode). It accepts external crystals from 32 kHz to 4 MHz, resonators, or direct clock input on EXTAL, and can operate autonomously using its trimmed internal RC oscillator - all configurable via ICGC1/ICGC2 registers.

How many I/O pins does the MC9S08AC8CFGE provide, and what configurability options are available?

The MC9S08AC8CFGE provides 28 general-purpose I/O pins across Ports A–D. Each pin supports software-selectable internal pullups (reducing external resistors), slew rate control (for EMI mitigation), and drive strength selection (4 mA or 12 mA). Pin functions are multiplexed with peripherals like SCI, SPI, TPM, and ADC, and configured via dedicated port control registers (e.g., PTAPE, PTASE).

Is the MC9S08AC8CFGE pin-compatible with other members of the HCS08 AC series?

Yes, the MC9S08AC8CFGE in 32-pin QFN (98ASA00473D) shares identical pinout and package dimensions with MC9S08AC16CFGE and MC9S08AW8ACFGE. This enables hardware reuse across variants - firmware can be scaled between 8 KB and 16 KB FLASH versions without PCB redesign, provided peripheral usage remains within the 28 I/O and resource limits of the smaller variant.