NXP Semiconductors MC68HC908GP16CFB

Overview

MC68HC908GP16CFB from NXP (formerly Motorola) is an 8-bit HCS08-core microcontroller with 16 KB on-chip FLASH, 512 B RAM, and integrated peripherals including ADC, SCI, SPI, TIM, KBI, and COP watchdog. It operates at up to 8 MHz bus frequency, supports 5 V operation, and targets embedded control in industrial sensors and appliance motor interfaces.

For engineers reviewing the MC68HC908GP16CFB datasheet, MC68HC908GP16CFB pinout, MC68HC908GP16CFB application, or MC68HC908GP16CFB equivalent, key selection criteria include its 44-pin QFP package, 8-channel 8-bit ADC, single-scan SCI UART, and FLASH-based field-programmability for cost-sensitive, low-power control systems.

Technical Context

The MC68HC908GP16CFB implements the HCS08 CPU core with enhanced addressing modes and a 16-bit index register. Its Clock Generator Module (CGM) supports crystal oscillator input (1–8 MHz) with PLL multiplication to generate internal bus clocks up to 8 MHz, enabling deterministic real-time response in closed-loop control.

Peripheral integration includes a 16-bit Timer Interface Module (TIM) with two 8-bit channels, a Keyboard Interrupt Module (KBI) supporting up to 8 keys with debouncing, and a 5-channel SCI/SPI shared serial interface - all managed via memory-mapped I/O registers accessible in user mode without privilege escalation.

Key Specifications

Pinout & Package

MC68HC908GP16CFB is housed in a 44-pin QFP (case 824A) with 0.8 mm lead pitch and exposed thermal pad. Pin assignments follow Motorola's standard HCS08 GP-series layout, with dedicated analog supply (VDDAD/VSSAD), crystal inputs (OSC1/OSC2), 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 MC9RS08KA8CFD, MC68HC908GP16CFB delivers higher real-time determinism and peripheral richness; versus MC9S08AC128CFB, it offers pin-compatible footprint and identical toolchain support while reducing memory overhead and BOM cost for fixed-function designs.

Availability

MC68HC908GP16CFB is available at Aetrix Electronics and suitable for industrial sensor nodes, home appliance motor controllers, smart power outlets, and legacy panel interface modules requiring stable component supply across extended production lifecycles.

Supply support for MC68HC908GP16CFB 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 delivering secure, scalable solutions for automotive, industrial, IoT, and communication infrastructure markets.

The MC68HC908GP16CFB belongs to the legacy HCS08 microcontroller family designed for cost-sensitive, 5 V embedded control applications where reliability, FLASH programmability, and peripheral integration outweigh raw performance demands.

FAQ

What is the maximum operating frequency of the MC68HC908GP16CFB?

The MC68HC908GP16CFB supports a maximum bus frequency of 8 MHz, derived from its internal PLL which multiplies a 1–8 MHz crystal input. This frequency governs instruction execution, peripheral timing, and ADC conversion rates. The device maintains full functionality across its specified temperature range (–40°C to +85°C) at this speed when powered within the 4.5–5.5 V range.

Does the MC68HC908GP16CFB support in-circuit programming?

Yes, the MC68HC908GP16CFB supports in-system programming (ISP) via its built-in monitor ROM (MON). Using the SCI interface and standard serial bootloader protocol, firmware can be updated without removing the device from the PCB. The 16 KB FLASH memory is organized into 512-byte blocks, each individually erasable and programmable under MCU control.

How many ADC channels does the MC68HC908GP16CFB have, and what is their resolution?

The MC68HC908GP16CFB integrates an 8-bit successive-approximation ADC with 8 input channels (AD0–AD7), mapped to Port B pins PTB0–PTB7. Each conversion completes in 13 µs at the maximum bus frequency, and the module supports software-triggered single or sequential scans. Reference voltage is selectable between internal bandgap (1.25 V) or external VREFH/VREFL pins.

What packaging options are available for the MC68HC908GP16CFB?

The MC68HC908GP16CFB is offered exclusively in a 44-pin Quad Flat Package (QFP) with case number 824A, measuring 10 mm × 10 mm with 0.8 mm lead pitch. This package includes an exposed thermal pad for improved heat dissipation and is RoHS-compliant. No SOIC, TSSOP, or die variants were released for this specific part number.

Is the MC68HC908GP16CFB pin-compatible with other GP-series microcontrollers?

The MC68HC908GP16CFB shares the same 44-pin QFP footprint and core peripheral mapping with MC68HC908GP32CFB and MC68HC908GP16CFU, differing only in FLASH size (16 KB vs. 32 KB) and package variant (CFB = QFP, CFU = SOIC). Pin functions, register layout, and electrical characteristics are identical across these variants, enabling drop-in replacement where memory requirements permit.