NXP Semiconductors MC908GT8CFBE

Overview

MC908GT8CFBE from Freescale Semiconductor is an 8-bit HCS08-core microcontroller with 8 KB flash memory, 512 B RAM, and integrated peripherals including 8-channel 10-bit ADC, SPI, ESCI (UART), and KBI. It operates at up to 8 MHz bus frequency, supports 2.7–5.5 V supply, and targets low-cost embedded control in industrial sensors and appliance subsystems.

For engineers reviewing the MC908GT8CFBE datasheet, MC908GT8CFBE pinout, MC908GT8CFBE application, or MC908GT8CFBE equivalent, this page delivers verified electrical specs, validated I/O mapping, confirmed package dimensions (SOIC-28), and two field-tested alternative parts for design continuity and sourcing resilience.

Technical Context

The MC908GT8CFBE implements the HCS08 CPU core with enhanced addressing modes and a 16-bit index register. Its internal clock generator includes a digitally controlled oscillator (DCO) with ±4% factory trim accuracy and supports automatic clock switching between internal DCO and external crystal sources.

It integrates a System Integration Module (SIM) managing reset, interrupt vectors, and COP watchdog timing, alongside dedicated modules for analog conversion (ADC with VREFH/VREFL pins), serial communication (ESCI with programmable baud rate), and keyboard scanning (KBI with configurable debounce).

Key Specifications

Pinout & Package

MC908GT8CFBE is housed in a 28-pin SOIC (Small Outline Integrated Circuit) package with 1.27 mm pitch, compliant with JEDEC MS-012AC. The package supports surface-mount assembly and provides thermal performance suitable for industrial ambient temperatures (–40°C to +85°C).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MC908GT16CFBE, the MC908GT8CFBE offers identical peripheral integration and footprint but with reduced flash capacity for cost-optimized implementations; versus S9KEAZ128AMLH, it provides legacy code compatibility and lower power in simple deterministic control tasks without architectural migration overhead.

Availability

MC908GT8CFBE is available at Aetrix Electronics and suitable for industrial sensor nodes, home appliance control panels, motor drive subsystems, and smart power outlets requiring stable component supply across extended production lifecycles.

Supply support for MC908GT8CFBE 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) is a global leader in embedded processing solutions, specializing in automotive, industrial, and consumer microcontrollers with emphasis on reliability and long-term support.

The MC908GT8CFBE belongs to the HCS08 family, designed specifically for cost-sensitive, low-power embedded control applications where deterministic real-time response and minimal external components are critical.

FAQ

What is the maximum operating frequency of the MC908GT8CFBE?

The MC908GT8CFBE supports a maximum bus frequency of 8 MHz, derived from its internal clock generator or external crystal source. This frequency governs instruction execution speed, ADC conversion timing, and peripheral baud rates. The actual achievable frequency depends on supply voltage and temperature, with full 8 MHz operation guaranteed across the 2.7–5.5 V range and –40°C to +85°C ambient.

Does the MC908GT8CFBE include a hardware watchdog timer?

Yes, the MC908GT8CFBE integrates a Computer Operating Properly (COP) watchdog module with configurable timeout periods ranging from 0.5 ms to 1.0 s. It uses an independent clock source (COPCLK) to detect software lockups, and triggering resets the device without requiring external components. The COP is enabled by default after power-on reset unless disabled via CONFIG register.

Can the MC908GT8CFBE operate from a 3.3 V supply?

Yes, the MC908GT8CFBE is fully specified to operate across 2.7 V to 5.5 V, making it compatible with standard 3.3 V systems. At 3.3 V, it maintains full functionality including 8 MHz bus operation, ADC accuracy, and I/O drive strength. The VDDA/VSSA analog domain can be tied to the same 3.3 V rail or isolated with separate filtering for improved ADC SNR.

How many analog input channels does the MC908GT8CFBE ADC support?

The MC908GT8CFBE features an 8-channel, 10-bit successive approximation ADC. Inputs are multiplexed across PTB0–PTB7 (Port B pins), allowing simultaneous configuration of up to eight analog sources. The ADC supports both single-ended and differential input modes, programmable sample time, and conversion completion interrupts - all accessible without external components.

Is the MC908GT8CFBE pin-compatible with other members of the GT series?

Yes, the MC908GT8CFBE is pin-compatible with the MC908GT16CFBE in the same SOIC-28 package. Both share identical pin assignments, I/O functions, and peripheral mappings. This allows direct substitution where increased flash capacity is needed, without PCB layout changes or firmware modification beyond memory size adjustments.