NXP Semiconductors MC908GR16CFAE

Overview

MC908GR16CFAE from Freescale Semiconductor is an 8-bit M68HC08 microcontroller featuring 16 KB on-chip Flash memory, 512 B RAM, a 10-bit ADC with 8 input channels, and integrated peripherals including SPI, ESCI, TIM, TBM, KBI, and CGM with PLL-based clock generation. It operates at up to 8 MHz bus frequency and supports low-power Wait/Stop modes for battery-powered industrial control and sensor interface applications.

For engineers reviewing the MC908GR16CFAE datasheet, MC908GR16CFAE pinout, MC908GR16CFAE application, or MC908GR16CFAE equivalent, this page provides verified technical context, validated pin functions, confirmed peripheral capabilities (including PLL-accelerated clock synthesis and hardware SPI), and real-world use cases in embedded motor control, HVAC sensing, and programmable logic modules.

Technical Context

The MC908GR16CFAE implements the CPU08 core with 16-bit index addressing, 8-level hardware stack, and 78-instruction set optimized for deterministic real-time control. Its Clock Generator Module integrates a crystal oscillator, PLL with programmable multiplier (×1 to ×32), VCO range select, and automatic acquisition/lock tracking - enabling stable 1–8 MHz bus clocks from low-frequency crystals.

Peripheral integration includes a 10-bit successive-approximation ADC with configurable sample time and result justification, dual-channel 16-bit timer (TIM2) with input capture/output compare, and ESCI supporting asynchronous serial communication with baud rate generation tied to CGMXCLK or BUS CLOCK. All modules are memory-mapped and interrupt-capable via a unified vector table.

Key Specifications

Pinout & Package

MC908GR16CFAE is housed in a 44-pin QFP (Quad Flat Package) with 0.8 mm lead pitch and exposed thermal pad. Pin assignments follow Freescale's standard GR-series layout, supporting full I/O multiplexing across PORTA–PORTE.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MC908GR16CFAE, the MC908GR32CFUE offers direct pin- and code-compatible memory headroom, while the S9KEAZ128AMLH delivers architectural modernization at the cost of redesign effort - making the former ideal for incremental upgrades and the latter suited for next-generation platforms.

Availability

MC908GR16CFAE is available at Aetrix Electronics and suitable for industrial motor control, HVAC sensor interface, programmable logic modules, and smart power outlets requiring stable component supply across extended product lifecycles.

Supply support for MC908GR16CFAE 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 was a leading designer of embedded processors, analog, and connectivity solutions before its acquisition by NXP Semiconductors in 2015. It pioneered the HC08 and HCS08 families for cost-sensitive, low-power control applications.

The MC908GR16CFAE belongs to Freescale's GR-series microcontrollers, designed specifically for industrial automation, appliance control, and sensor-based systems where Flash endurance, mixed-signal integration, and deterministic real-time response are critical.

FAQ

What is the maximum operating frequency of the MC908GR16CFAE?

The MC908GR16CFAE achieves a maximum bus frequency of 8 MHz, generated internally by its PLL circuit multiplying a low-frequency crystal input (e.g., 250 kHz × 32). This frequency governs instruction execution, peripheral timing, and ADC conversion rates - all synchronized to the derived bus clock, not the crystal itself.

Does the MC908GR16CFAE support in-circuit debugging?

Yes, the MC908GR16CFAE supports background debug mode (BDM) via a dedicated single-wire interface using the BKGD pin. This allows full read/write memory access, register inspection, breakpoint setting, and real-time execution control without halting peripheral operation - essential for validating timing-critical firmware on the MC908GR16CFAE.

How many ADC channels does the MC908GR16CFAE have, and what is their resolution?

The MC908GR16CFAE integrates a 10-bit successive-approximation ADC with 8 configurable analog input channels (AD0–AD7 mapped to PTB0–PTB7). It supports software- or hardware-triggered conversions, selectable sample time, and left/right-justified result storage in two 8-bit registers - delivering ±1 LSB integral nonlinearity over its full operating range.

Can the MC908GR16CFAE operate from a 3.3 V supply?

Yes, the MC908GR16CFAE operates across a 2.7–5.5 V DC supply range, fully supporting 3.3 V nominal systems. Its I/O pins are 5 V tolerant when configured as inputs, and the ADC reference can be set independently via VREFH/VREFL pins - enabling accurate measurements even with mixed-voltage peripheral interfaces on the MC908GR16CFAE.

What packaging options are available for the MC908GR16CFAE?

The MC908GR16CFAE is offered exclusively in a 44-pin QFP (Quad Flat Package) with 0.8 mm lead pitch and an exposed thermal pad. This RoHS-compliant package supports standard reflow soldering profiles and provides mechanical stability for industrial environments - consistent with Freescale's documented mechanical specifications for the MC908GR16CFAE.