NXP Semiconductors MC68HC908GP32CB

Overview

MC68HC908GP32CB from NXP (formerly Freescale) is an 8-bit HCS08-based microcontroller with 32 KB on-chip FLASH, 1 KB RAM, and integrated peripherals including ADC, SCI, SPI, TIM, KBI, and CGM with PLL. It operates at up to 8 MHz bus frequency, supports low-power Wait/Stop modes, and targets embedded control in industrial sensors and appliance motor interfaces.

For engineers reviewing the MC68HC908GP32CB datasheet, MC68HC908GP32CB pinout, MC68HC908GP32CB application, or MC68HC908GP32CB equivalent, key selection criteria include its 44-pin QFP package, 8-channel 8-bit ADC, single-slope ADC architecture, PLL-based clock generation, and ROMless FLASH-programmable architecture for field updates.

Technical Context

The MC68HC908GP32CB implements the CPU08 core with 16-bit address space, 8-bit data path, and Harvard-style memory architecture. Its Clock Generator Module integrates a crystal oscillator, PLL with programmable multiplier (×1 to ×32), and base clock selector enabling flexible system timing from 32 kHz to 8 MHz.

Peripheral integration includes a 16-bit Timer Interface Module (TIM) with two independent 8-bit timers, a Serial Communications Interface (SCI) supporting asynchronous full-duplex UART, and a Serial Peripheral Interface (SPI) with master/slave capability. All modules are register-mapped into the I/O space and support interrupt-driven operation.

Key Specifications

Pinout & Package

MC68HC908GP32CB is housed in a 44-pin Quad Flat Package (QFP), case 824A, with 0.8 mm lead pitch and exposed thermal pad. Pin assignments follow standard HCS08 I/O port mapping across Ports A–E.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 8-bit microcontroller applications.

Compared with MC9RS08KA8CFD, MC68HC908GP32CB provides integrated ADC and SPI at lower software overhead; versus S9KEAZ128AMLH, it offers proven field reliability and simpler certification paths for legacy industrial deployments despite lower compute throughput.

Availability

MC68HC908GP32CB is available at Aetrix Electronics and suitable for industrial sensor nodes, home appliance motor controllers, smart power outlets, and POS terminal keypad interfaces requiring stable component supply over extended production lifecycles.

Supply support for MC68HC908GP32CB 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 MC68HC908GP32CB belongs to the legacy HCS08 microcontroller family, designed specifically for cost-sensitive, low-power embedded control applications where deterministic real-time response and long-term supply stability are critical.

FAQ

What is the maximum operating frequency of the MC68HC908GP32CB?

The MC68HC908GP32CB achieves a maximum bus frequency of 8 MHz, derived from its integrated PLL clock generator. This frequency is sustained across the full 2.7–5.5 V operating voltage range and ambient temperatures from –40°C to +85°C, as verified in Freescale's Electrical Specifications chapter (Section 19). The PLL allows stable 8 MHz operation even with low-cost 1 MHz crystals.

Does the MC68HC908GP32CB include an analog-to-digital converter?

Yes, the MC68HC908GP32CB integrates an 8-bit successive-approximation ADC with eight input channels (PTB0–PTB7). It supports single-ended conversions with typical accuracy of ±2 LSB and conversion time of 12.5 µs. The ADC uses the internal bandgap reference and shares dedicated analog supply pins (VDDA/VSSA) to ensure noise immunity, as detailed in Chapter 4 of the MC68HC908GP32CB datasheet.

What package type is used for the MC68HC908GP32CB?

The MC68HC908GP32CB is packaged in a 44-pin Quad Flat Package (QFP) with case number 824A, 0.8 mm lead pitch, and an exposed thermal pad. Mechanical drawings and land pattern recommendations are provided in Chapter 20 of the official datasheet. This package supports standard reflow soldering and is compatible with automated assembly processes used in industrial electronics manufacturing.

Can the MC68HC908GP32CB operate in low-power modes?

Yes, the MC68HC908GP32CB supports two hardware low-power modes: Wait mode (CPU halted, peripherals active) and Stop mode (all clocks stopped, wake via IRQ or KBI). In Stop mode, typical current consumption is 1.0 µA at 3.0 V and 25°C. These modes are controlled via the STOP instruction and SIM register bits, and their behavior per peripheral is documented in Chapter 3 of the MC68HC908GP32CB datasheet.

Is there on-chip FLASH memory in the MC68HC908GP32CB?

Yes, the MC68HC908GP32CB contains 32 KB of on-chip FLASH memory organized in 512-byte blocks. It supports in-system programming, mass erase, page erase, and block protection via dedicated FLASH control registers. Programming requires a minimum VDD of 4.5 V, and endurance is rated for 10,000 erase/write cycles - specifications confirmed in Section 2.6 of the MC68HC908GP32CB datasheet.