NXP Semiconductors MC908GR32ACFAE

Overview

MC908GR32ACFAE from Freescale Semiconductor is an 8-bit HCS08-core microcontroller with 32 KB on-chip Flash memory, 1 KB RAM, and integrated peripherals including ADC, ESCI, SPI, TIM1/TIM2, TBM, and KBI. It operates at up to 8 MHz bus frequency, supports 5.0 V operation, and targets embedded control in industrial sensors, motor drives, and appliance subsystems.

For engineers reviewing the MC908GR32ACFAE datasheet, MC908GR32ACFAE pinout, MC908GR32ACFAE application, or MC908GR32ACFAE equivalent, this page delivers verified technical context, package mapping, functional pin roles, real-world use cases, and validated alternative options for design-in and supply continuity.

Technical Context

The MC908GR32ACFAE implements the HCS08 CPU core with 16-bit address space, supporting indexed, extended, and relative addressing modes. Its Clock Generator Module (CGM) integrates a crystal oscillator and PLL for flexible clock synthesis, enabling programmable bus frequencies from DC to 8 MHz.

It includes dual Flash blocks (FLASH-1 and FLASH-2) with independent block protection, allowing secure firmware updates and bootloader separation. The 8-channel 10-bit ADC supports single-ended inputs across multiple ports, with configurable conversion timing and interrupt-driven operation.

Key Specifications

Pinout & Package

MC908GR32ACFAE is housed in a 64-pin QFP (Quad Flat Package) with 0.5 mm pitch, compliant with JEDEC MS-026. Thermal pad exposed on underside for enhanced heat dissipation in continuous operation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MC908GR60ACFAE, the MC908GR32ACFAE offers identical peripheral integration and timing performance but with optimized memory allocation for mid-complexity applications; versus MC9S08QG8CDTE, it delivers significantly greater I/O flexibility, ADC channel count, and protocol support at the cost of package size and power envelope.

Availability

MC908GR32ACFAE is available at Aetrix Electronics and suitable for industrial sensor nodes, appliance control panels, and BLDC motor controllers requiring stable component supply and long-term production support.

Supply support for MC908GR32ACFAE 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

Freescale Semiconductor (now part of NXP Semiconductors) pioneered mixed-signal microcontrollers for automotive and industrial markets, emphasizing robustness, integrated analog, and low-power operation.

The MC908GR32ACFAE belongs to the HCS08 GR-series, designed specifically for cost-sensitive, high-reliability embedded control applications demanding rich peripheral integration without external support chips.

FAQ

What is the maximum operating frequency of the MC908GR32ACFAE?

The MC908GR32ACFAE supports a maximum bus frequency of 8 MHz, derived from its internal PLL and crystal oscillator circuitry. This frequency governs instruction execution speed, ADC conversion timing, and peripheral clock domains. Operation at 8 MHz requires a minimum VDD of 4.5 V and proper PCB layout for oscillator stability. The MC908GR32ACFAE achieves this performance while maintaining compatibility with standard 5 V logic families and legacy industrial interfaces.

Does the MC908GR32ACFAE support in-circuit programming?

Yes, the MC908GR32ACFAE supports in-circuit programming via its Background Debug Mode (BDM) interface using a standard BDM pod or compatible debugger. Flash memory can be reprogrammed without removing the device from the target board, and both FLASH-1 and FLASH-2 blocks support page erase and byte programming. The MC908GR32ACFAE requires only four BDM signals (BKGD, RESET, VDD, VSS) and operates under full software control through Freescale's Codewarrior development environment.

How many ADC channels does the MC908GR32ACFAE provide, and what is their resolution?

The MC908GR32ACFAE integrates a single 10-bit successive approximation ADC with 8 selectable input channels mapped across Port A and Port B (AD0–AD15). Channel selection is software-configurable via ADC register settings, and conversions can be triggered manually or synchronized to timer events. The MC908GR32ACFAE ADC provides ±2 LSB integral nonlinearity and supports both left- and right-justified result formats for flexible data handling in control loops.

What debug interface does the MC908GR32ACFAE use?

The MC908GR32ACFAE uses Freescale's Background Debug Mode (BDM) interface, accessed via a dedicated BKGD pin and active-low RST. This single-wire debug interface supports full read/write access to memory and registers, real-time variable inspection, breakpoint insertion, and flash programming - all without halting the CPU during normal operation. The MC908GR32ACFAE BDM implementation complies with the HCS08 BDM specification and is supported by standard Freescale and third-party debug tools.

Is the MC908GR32ACFAE RoHS compliant?

Yes, the MC908GR32ACFAE is RoHS compliant and lead-free, meeting EU Directive 2011/65/EU requirements. The device uses matte tin (Sn) termination on all leads and conforms to JEDEC J-STD-020 moisture sensitivity level 3 (MSL-3) for surface-mount assembly. The MC908GR32ACFAE packaging and materials documentation is available in Freescale's official product change notices and material declarations, ensuring compliance for global industrial and consumer deployments.