NXP Semiconductors MC9S08AC48CPUE

Overview

MC9S08AC48CPUE from NXP Semiconductors (formerly Freescale) is an 8-bit HCS08 microcontroller with 48 KB flash, 1.5 KB RAM, 48-pin QFN package, and integrated peripherals including dual SCI, SPI, I²C, 16-channel 10-bit ADC, and triple TPM timer modules - used in automotive body control modules and industrial sensor nodes requiring compact footprint and LIN 2.0 support.

For engineers reviewing the MC9S08AC48CPUE datasheet, MC9S08AC48CPUE pinout, MC9S08AC48CPUE application, or MC9S08AC48CPUE equivalent, key selection criteria include its 48-pin QFN thermal pad package, 20 MHz bus frequency, on-chip background debug module, LIN-compliant SCI with extended break generation, and FLASH security options for firmware protection in cost-sensitive embedded systems.

Technical Context

The MC9S08AC48CPUE implements the S08CPUV2 core with HC08 instruction set extension (BGND), operates at up to 40 MHz CPU clock and 20 MHz bus frequency, and integrates an Internal Clock Generator (ICG) with NVM-trimmed precision oscillator for crystal-free operation. Its memory subsystem includes 48 KB of FLASH with block protection and 1.5 KB of RAM with retention in Stop2 mode.

Peripherals are organized around three independent clock domains: bus clock for general logic, ADC clock derived from bus clock via prescaler, and ICG-sourced clock for real-time interrupt (RTI). The device supports active background debugging via BKGD/MS pin and includes hardware CRC module compliant with ITU-T (CCITT) polynomial x¹⁶ + x¹² + x⁵ + 1.

Key Specifications

Pinout & Package

MC9S08AC48CPUE uses a 48-pin QFN package (case outline 98ASA00466D) with 7 mm × 7 mm body, 0.5 mm lead pitch, and exposed thermal pad for enhanced thermal dissipation in space-constrained applications.

Key Features

Applications

Equivalent & Alternatives

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

Compared with S9KEAZN64AMLH and MC9S08AC60CPUE, the MC9S08AC48CPUE offers optimal balance of proven LIN integration, minimal debug overhead, and cost-effective 48 KB code storage - making it ideal for volume production of automotive body electronics where toolchain continuity and qualification time are critical.

Availability

MC9S08AC48CPUE is available at Aetrix Electronics and suitable for automotive body control, industrial sensor nodes, smart lighting panels, and appliance motor interfaces requiring stable component supply and long-term lifecycle support.

Supply support for MC9S08AC48CPUE 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 applications, with roots in Freescale's microcontroller heritage.

The HCS08 family - including MC9S08AC48CPUE - was designed for cost-sensitive, functionally safe embedded control in automotive body electronics and industrial automation, emphasizing LIN compliance, debug simplicity, and thermal reliability in compact packages.

FAQ

What is the maximum bus frequency supported by the MC9S08AC48CPUE?

The MC9S08AC48CPUE supports a maximum bus frequency of 20 MHz, derived from its 40-MHz CPU clock via internal divide-by-2 logic. This frequency governs peripheral timing, FLASH access speed, and ADC conversion rates. Operation at 20 MHz is validated across the full industrial temperature range (−40°C to +105°C) and requires proper decoupling on VDD/VSS and VDDAD/VSSAD rails as specified in the MC9S08AC60 Series Data Sheet, Rev. 3.

Does the MC9S08AC48CPUE include hardware support for LIN 2.0 communication?

Yes, the MC9S08AC48CPUE includes dual SCI modules with native LIN 2.0 and SAE J2602 compliance. Each SCI supports master extended break generation and slave extended break detection, enabling direct connection to LIN transceivers without software bit-banging. The MC9S08AC48CPUE's SCI hardware handles break field timing, sync field detection, and identifier filtering per LIN specification, reducing CPU load during network arbitration.

What package type and thermal characteristics does the MC9S08AC48CPUE use?

The MC9S08AC48CPUE uses a 48-pin QFN package (case outline 98ASA00466D) with 7 mm × 7 mm body, 0.5 mm pitch, and exposed thermal pad. Its junction-to-board thermal resistance (θ_JB) is 22°C/W, enabling reliable operation at 20 MHz bus frequency in 70°C ambient when soldered to a 2-layer PCB with ≥4 thermal vias under the pad. This package replaces earlier gold-wire variants with copper-wire bonding per Freescale QFN Addendum Rev. 0 (July 2014).

Can the MC9S08AC48CPUE operate without an external crystal?

Yes, the MC9S08AC48CPUE can operate without an external crystal using its Internal Clock Generator (ICG) module, which provides a factory-trimmed 31.25 kHz or user-trimmable 1–20 MHz clock source. The ICG supports precision NVM trimming for ±2% accuracy across temperature and voltage, eliminating crystal cost and board space in non-timing-critical applications such as sensor polling or LIN node control where absolute timebase accuracy is not required.

How does FLASH security work on the MC9S08AC48CPUE?

FLASH security on the MC9S08AC48CPUE is implemented via FOPT/NVOPT register bits and FLASH block protection registers (FPROT/NVPROT). When security is enabled, the entire FLASH array becomes inaccessible via background debug or in-application programming - preventing readout or erase commands. Security activation is irreversible unless a mass erase is performed via dedicated BDM command, and the MC9S08AC48CPUE retains this state across power cycles and resets, ensuring firmware IP protection in deployed automotive and industrial units.