NXP Semiconductors MC908GP32CBE

Overview

MC908GP32CBE from Freescale Semiconductor is an 8-bit HCS08-core microcontroller with 32 KB on-chip Flash, 1 KB RAM, and integrated peripherals including ADC (8-channel, 10-bit), SCI, SPI, TIM, KBI, and CGM with PLL-based clock generation. It operates at up to 8 MHz bus frequency and supports low-power Wait/Stop modes for battery-powered industrial controls and sensor interfaces.

For engineers reviewing the MC908GP32CBE datasheet, MC908GP32CBE pinout, MC908GP32CBE application, or MC908GP32CBE equivalent, key selection criteria include its 44-pin QFP package, 5 V operation, internal PLL clock synthesis, Flash reprogrammability in-system, and support for real-time interrupt-driven I/O control in embedded instrumentation.

Technical Context

The MC908GP32CBE implements the HCS08 CPU core with enhanced addressing modes and a 16-bit index register, executing instructions at up to 8 MHz derived from a PLL-synthesized bus clock. Its Clock Generator Module accepts external crystal (1–8 MHz) or ceramic resonator input and provides programmable PLL multiplication (×1 to ×32) with manual/automatic bandwidth control.

Peripheral integration includes a 10-bit ADC with 8 analog inputs and software/hardware trigger options, dual 16-bit timer channels (TIM1/TIM2) supporting input capture/output compare/PWM, and full-duplex SCI with 9-bit UART framing plus SPI master/slave mode - all mapped to dedicated I/O ports with configurable pull-ups and slew-rate control.

Key Specifications

Pinout & Package

MC908GP32CBE is housed in a 44-pin QFP (case 824A) with 0.8 mm lead pitch and exposed thermal pad. Pin functions are defined per Rev. 10 datasheet Section 1.4 and 1.5.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MC908GP32CBE, MC908AP64CFUE offers expanded memory and CAN while retaining identical peripheral architecture and pinout, whereas S9KEAZ128AMLH delivers significantly higher processing capability and feature set at the cost of architectural discontinuity and redesign effort.

Availability

MC908GP32CBE is available at Aetrix Electronics and suitable for industrial sensor nodes, motor control interfaces, smart power meter front-ends, and building automation keypads requiring stable component supply and long-term manufacturability.

Supply support for MC908GP32CBE 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 mixed-signal microcontrollers for cost-sensitive industrial and automotive applications with robust analog integration and low-power design.

The MC908GP32CBE belongs to the HCS08 family, engineered for deterministic real-time control in resource-constrained environments where Flash programmability, peripheral flexibility, and 5 V operation are essential.

FAQ

What is the maximum operating frequency of the MC908GP32CBE?

The MC908GP32CBE supports a maximum bus frequency of 8 MHz, achieved via its integrated PLL clock generator. This frequency is derived from an external crystal (1–8 MHz) multiplied by programmable factors (×1 to ×32). The actual achievable speed depends on VDD (5 V ±10%), ambient temperature, and oscillator stability - all specified in the Electrical Characteristics chapter of the Rev. 10 datasheet. MC908GP32CBE maintains timing compliance across its full industrial temperature range (–40°C to +85°C) at this rate.

Does the MC908GP32CBE support in-circuit debugging?

Yes, the MC908GP32CBE supports background debug mode (BDM) via a dedicated single-wire interface, enabling non-intrusive program download, breakpoint setting, and register inspection without halting real-time peripheral operation. This capability is implemented in silicon and requires only a BDM pod (e.g., DEMO908GP32) and compatible IDE such as CodeWarrior Development Studio. MC908GP32CBE does not require external JTAG hardware or dedicated debug pins beyond the BDM pin.

How many analog input channels does the ADC in the MC908GP32CBE support?

The MC908GP32CBE integrates a 10-bit successive-approximation ADC with 8 configurable analog input channels (AD0–AD7), mapped to Port B pins PTB0 through PTB7. Each channel supports software or hardware (TIM/SCI) triggering, and the ADC includes built-in sample-and-hold with programmable conversion clocks. MC908GP32CBE's ADC achieves ±2 LSB integral nonlinearity and supports reference voltages from internal bandgap or external VREFH/VREFL pins.

What low-power modes are available on the MC908GP32CBE?

The MC908GP32CBE provides two hardware-supported low-power states: Wait mode (CPU halted, peripherals active, wake via IRQ/KBI/SCI) and Stop mode (all clocks stopped except LVI and optional RTC, wake via IRQ/RST only). Current consumption drops to ~20 µA in Wait and <1 µA in Stop mode at 5 V/25°C. MC908GP32CBE retains RAM contents and register states across both modes, enabling rapid resumption of control tasks without full reinitialization.

Is the MC908GP32CBE pin-compatible with other HCS08 devices?

The MC908GP32CBE uses a 44-pin QFP package (case 824A) shared with several HCS08 derivatives including MC908GP32MFUE and MC908AP64CFUE, but pin assignments differ for peripheral functions like SPI/SCI/TIM. While mechanical footprint is identical, electrical compatibility requires verification of signal mapping per device-specific pin function tables. MC908GP32CBE is not a drop-in replacement for MC68HC908GP32 variants with different suffixes due to differences in Flash configuration and oscillator enable bits.