NXP Semiconductors MC908GR16ACFJE

Overview

MC908GR16ACFJE from Freescale Semiconductor is an 8-bit HCS08 microcontroller featuring 16 KB on-chip Flash memory, 512 B RAM, a 10-bit ADC with 8 input channels, and integrated peripherals including ESCI, SPI, two timer modules (TIM1/TIM2), KBI, COP watchdog, and a PLL-based Clock Generator Module. It operates at up to 8 MHz bus frequency and targets embedded control in automotive body electronics, industrial sensors, and appliance motor control.

For engineers reviewing the MC908GR16ACFJE datasheet, MC908GR16ACFJE pinout, MC908GR16ACFJE application, or MC908GR16ACFJE equivalent, key selection criteria include its 48-pin LQFP package, VDD range of 2.7–5.5 V, low-power wait/stop modes, Flash programmability in-system, and support for keyboard interrupt scanning and serial communication protocols.

Technical Context

The MC908GR16ACFJE implements the CPU08 core with 8-bit ALU, 16-bit index and stack pointers, and condition-code register. Its Clock Generator Module integrates a crystal oscillator, PLL with programmable multiplier (×1 to ×32), and base clock selector supporting multiple internal/external sources.

The device includes dual low-power modes: Wait mode halts the CPU while preserving peripheral clocks and RAM, and Stop mode disables all clocks except real-time interrupt sources. The ADC supports left/right-justified 10-bit conversions with configurable sample time and auto-triggering via TIM or ESCI events.

Key Specifications

Pinout & Package

MC908GR16ACFJE is housed in a 48-pin LQFP (7 mm × 7 mm, 0.5 mm pitch) with exposed thermal pad. Pin functions are defined per Chapter 1.4 and 1.5 of the Rev. 1.0 datasheet, including dedicated analog supply pins (VDDAD/VSSAD), PLL analog rails (VDDA/VSSA), and multiplexed I/O ports A–E.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MC908GR16ACFJE, the MC908AP64CFUE offers greater memory headroom for feature-rich firmware, while the S9KEAZ128AMLH delivers architectural modernization and ARM ecosystem advantages - both require PCB redesign due to different pinouts and voltage requirements.

Availability

MC908GR16ACFJE is available at Aetrix Electronics and suitable for automotive body electronics, industrial sensor nodes, and home appliance motor control requiring stable component supply and long-lifecycle support.

Supply support for MC908GR16ACFJE 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 since 2015) pioneered 8-bit and 32-bit microcontrollers for automotive and industrial markets, emphasizing robustness, qualification rigor, and long-term availability.

The MC908GR16ACFJE belongs to the HCS08 family, designed specifically for cost-sensitive, low-power embedded control applications where Flash flexibility, analog integration, and proven qualification matter more than raw throughput.

FAQ

What is the maximum operating frequency of the MC908GR16ACFJE?

The MC908GR16ACFJE achieves a maximum bus frequency of 8 MHz. This is generated by its internal PLL, which can multiply a crystal input (1–8 MHz) up to 32×. For example, a 4 MHz crystal yields an 8 MHz bus clock in ×2 mode. The CPU executes instructions at this bus rate, with most instructions completing in 1–3 bus cycles.

Does the MC908GR16ACFJE support in-circuit debugging?

Yes, the MC908GR16ACFJE supports background debug mode (BDM) via a single-wire interface using the BKGD pin. This allows full read/write access to memory and registers, breakpoint setting, and real-time execution control without halting the entire system - essential for development and field diagnostics of the MC908GR16ACFJE.

What are the ADC reference voltage options for the MC908GR16ACFJE?

The MC908GR16ACFJE ADC supports two reference configurations: (1) external reference using VREFH and VREFL pins, or (2) internal bandgap reference (1.25 V nominal) routed to VREFH. VDDAD may also serve as the high-side reference when VREFH is unconnected. All options are software-selectable via the ADCSC1 register in the MC908GR16ACFJE.

How does the Keyboard Interrupt Module (KBI) function on the MC908GR16ACFJE?

The KBI in the MC908GR16ACFJE monitors up to eight inputs (PTA0–PTA7) for key press/release transitions. It features programmable debounce timing, automatic wake-from-Stop capability, and interrupt generation on either edge. Configuration is handled through the KBIPE and KBISC registers, enabling low-power human-interface applications without CPU polling overhead in the MC908GR16ACFJE.

Is the MC908GR16ACFJE RoHS compliant and lead-free?

Yes, the MC908GR16ACFJE is RoHS compliant and manufactured with lead-free terminations. The "JE" suffix in the part number denotes lead-free, green (halogen-free) packaging per Freescale's standard qualification. Full compliance documentation, including test reports and material declarations, is available upon request for the MC908GR16ACFJE.