NXP Semiconductors MC908GP32CFBR2

Overview

MC908GP32CFBR2 from Freescale Semiconductor is an 8-bit HCS08 microcontroller featuring 32 KB on-chip FLASH, 1 KB RAM, a 10-bit ADC with 8 input channels, two 16-bit timer modules (TIM1/TIM2), and integrated SPI/SCI serial interfaces. It operates at up to 8 MHz bus frequency with internal PLL clock generation and supports low-power Wait/Stop modes for battery-sensitive embedded control applications such as motor drive supervision and sensor interface modules.

For engineers reviewing the MC908GP32CFBR2 datasheet, MC908GP32CFBR2 pinout, MC908GP32CFBR2 application, or MC908GP32CFBR2 equivalent, key selection criteria include its 48-pin LQFP package, VDD range of 2.7–5.5 V, Flash endurance (10k erase/write cycles), COP watchdog timing, and compatibility with HC08 development tools and legacy code bases.

Technical Context

The MC908GP32CFBR2 implements the CPU08 core with 16-bit address space, indexed addressing modes, and 72-instruction set optimized for deterministic real-time control. Its Clock Generator Module integrates a crystal oscillator, PLL with programmable multiplier (×1 to ×32), and base clock selector supporting multiple clock sources including external crystals (1–8 MHz) and internal RC.

Peripheral integration includes a 10-bit successive-approximation ADC with configurable sample time and conversion trigger sources (software, TIM, SCI), dual 16-bit timers with input capture/output compare/PWM capability, and full-duplex SCI with 8-bit UART functionality plus SPI master/slave mode - all accessible via memory-mapped I/O registers and interrupt-driven operation.

Key Specifications

Pinout & Package

MC908GP32CFBR2 is housed in a 48-pin LQFP (7 mm × 7 mm, 0.5 mm pitch) package with exposed thermal pad. Pin assignments follow standard HCS08 port mapping: Port A (KBI inputs), Port B (ADC analog inputs), Port C (general-purpose I/O), Port D (timer/SS/IRQ), Port E (SCI TX/RX).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MC908GP32CFBR2, the MC9S08GB60CFB offers greater processing headroom and USB but demands layout changes and firmware adaptation, while the MC9RS08KA2CSC sacrifices analog and timing capability for minimal size and cost - making MC908GP32CFBR2 optimal for balanced mixed-signal control where legacy toolchain support and proven reliability are critical.

Availability

MC908GP32CFBR2 is available at Aetrix Electronics and suitable for industrial motor control, smart sensor nodes, home appliance UIs, and legacy PLC I/O modules requiring stable component supply and long-term manufacturability.

Supply support for MC908GP32CFBR2 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 pioneer in embedded microcontrollers, known for robust automotive and industrial-grade silicon with strong ecosystem support.

The MC908GP32CFBR2 belongs to the HCS08 family, designed specifically for cost-sensitive, mixed-signal embedded control applications demanding high reliability, low power, and seamless migration from older HC05/HC08 platforms.

FAQ

What is the maximum operating frequency of the MC908GP32CFBR2?

The MC908GP32CFBR2 achieves a maximum bus frequency of 8 MHz. This is derived either directly from an external crystal (1–8 MHz) or via its integrated PLL, which multiplies the crystal frequency by factors from ×1 to ×32. The actual achievable frequency depends on the selected crystal and PLL configuration register settings, with typical configurations targeting 4–8 MHz for optimal balance of performance and power consumption in the MC908GP32CFBR2.

Does the MC908GP32CFBR2 support in-circuit debugging?

Yes, the MC908GP32CFBR2 supports in-circuit debugging via the Background Debug Mode (BDM) interface using a single-wire connection. This allows full read/write access to memory and registers, breakpoint insertion, and real-time execution control without requiring dedicated debug pins - a feature implemented in the MC908GP32CFBR2's System Integration Module (SIM) and enabled through the BKGD pin.

What ADC resolution and channel count does the MC908GP32CFBR2 provide?

The MC908GP32CFBR2 integrates a 10-bit successive-approximation ADC with 8 input channels mapped to Port B pins (PTB0–PTB7). It supports software, timer, or SCI-triggered conversions, with a typical conversion time of 25 µs at 8 MHz bus clock. The ADC includes dedicated analog power (VDDA/VSSA) and reference pins (VREFH/VREFL), enabling accurate measurements in noisy industrial environments - a core capability of the MC908GP32CFBR2.

How is Flash memory protected against accidental erasure in the MC908GP32CFBR2?

The MC908GP32CFBR2 implements Flash block protection via the FLASH Block Protect Register (FBPROT), allowing independent locking of 512-byte sectors. Once enabled, protected blocks cannot be erased or programmed without first executing a specific unprotect sequence involving write-access to reserved memory locations - a hardware-enforced safeguard built into the MC908GP32CFBR2 to prevent field corruption during firmware updates.

What low-power modes are supported by the MC908GP32CFBR2 and how do they differ?

The MC908GP32CFBR2 supports two primary low-power modes: Wait mode halts the CPU while keeping peripherals (ADC, timers, SCI) operational and responsive to interrupts; Stop mode gates all clocks except the LVI and optional RTC, retaining RAM contents with typical current draw below 1 µA. Both modes are entered via STOP or WAIT instructions and exited by reset or configured wake events - essential power-saving features engineered into the MC908GP32CFBR2 for battery-powered applications.