NXP Semiconductors MC908GP32CFBE

Overview

MC908GP32CFBE 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 including motor drive supervision and sensor interface modules.

For engineers reviewing the MC908GP32CFBE datasheet, MC908GP32CFBE pinout, MC908GP32CFBE application, or MC908GP32CFBE equivalent, this page delivers verified technical context, package mapping, functional pin roles, real-world use cases, and validated alternative options - all grounded in Freescale's Rev. 10 datasheet and official mechanical specifications.

Technical Context

The MC908GP32CFBE implements the CPU08 core with 8-bit data path, 16-bit addressing, and Harvard architecture memory organization. Its Clock Generator Module (CGM) 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 oscillators.

Peripheral integration includes dual 16-bit timer modules with input capture/output compare capabilities, a 10-bit successive-approximation ADC with configurable sample time and conversion trigger sources (software, timer overflow, external pin), and full-duplex SCI and master/slave SPI communication controllers - all accessible via memory-mapped I/O registers and interrupt-driven operation.

Key Specifications

Pinout & Package

MC908GP32CFBE is housed in a 44-pin QFP (Quad Flat Package), case 824A, with 0.8 mm lead pitch and 10 mm × 10 mm body size per Freescale Mechanical Specifications (Chapter 20, Rev. 10).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MC908GP32CFBE, MC908AP64CFBE offers direct scalability within the same family and footprint, while S9KEAZ128AMLH provides modern ARM-based performance at the cost of software rework - making the former ideal for incremental upgrades and the latter suited for next-generation platform development.

Availability

MC908GP32CFBE is available at Aetrix Electronics and suitable for industrial motor control, smart sensor nodes, appliance user interfaces, and power supply monitoring requiring stable component supply across extended production lifecycles.

Supply support for MC908GP32CFBE 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) pioneered 8-bit and 32-bit microcontrollers for automotive, industrial, and consumer applications with emphasis on robustness and mixed-signal integration.

The MC908GP32CFBE belongs to the HCS08 family, designed specifically for cost-sensitive, low-power embedded control tasks where deterministic real-time response, on-chip FLASH flexibility, and peripheral integration outweigh raw processing speed.

FAQ

What is the maximum operating frequency of the MC908GP32CFBE?

The MC908GP32CFBE supports a maximum bus frequency of 8 MHz. This is achieved using the internal PLL with programmable multiplication factor (×1 to ×32) driven by an external crystal (1–8 MHz) or internal RC oscillator. The actual system clock depends on CGM configuration, and timing-critical peripherals like TIM and ADC scale accordingly. MC908GP32CFBE datasheet Rev. 10 specifies 8 MHz as the guaranteed maximum under all valid VDD and temperature conditions.

Does the MC908GP32CFBE include hardware debug support?

Yes, the MC908GP32CFBE integrates a Break Module (BRK) that provides non-intrusive on-chip debugging capabilities. It supports single-stepping, register read/write, and breakpoint triggering without requiring external JTAG hardware. This functionality is accessible via Freescale's BDM (Background Debug Mode) interface using standard tools like P&E Micro's Cyclone programmers. MC908GP32CFBE's BRK module is fully documented in Chapter 18 of the Rev. 10 datasheet.

Can the MC908GP32CFBE operate from a 3.3 V supply?

Yes, the MC908GP32CFBE operates across a supply range of 2.7 V to 5.5 V, making 3.3 V fully compliant. At 3.3 V, the maximum bus frequency remains 8 MHz, and all I/O pins are 5 V tolerant when configured as inputs. The ADC reference can be internally tied to VDD or externally supplied, allowing accurate measurements even with 3.3 V rail. MC908GP32CFBE electrical specifications in Chapter 19 confirm full functionality at 3.3 V.

How many ADC channels does the MC908GP32CFBE support?

The MC908GP32CFBE features an 8-channel, 10-bit successive-approximation ADC. Channels AD0–AD7 map directly to Port B pins PTA0–PTA7, enabling simultaneous analog sensing on up to eight inputs. Conversion time is typically 16 µs, and triggers can originate from software, timer overflow, or external events. MC908GP32CFBE's ADC section (Chapter 4) confirms channel count, resolution, and timing behavior under all supported VDD conditions.

Is the MC908GP32CFBE pin-compatible with other HCS08 devices?

The MC908GP32CFBE uses a 44-pin QFP package (case 824A) shared with several HCS08 family members, including MC908AP64CFBE and MC908GR60CFBE. Pin functions for power, reset, oscillator, and core peripherals are consistent across these variants. However, peripheral pin mappings (e.g., SCI vs. SPI assignments on Port D) differ between models - so PCB layout reuse requires verification against each device's specific pin assignment table (Section 1.4, Rev. 10). MC908GP32CFBE's pin compatibility is limited to functionally aligned variants, not the entire HCS08 family.