NXP Semiconductors MC908BD48IBE

Overview

MC908BD48IBE from NXP Semiconductors (formerly Freescale) is an 8-bit HCS08 microcontroller with 48 KB on-chip FLASH, 1 KB RAM, and integrated USB 1.1 device controller, ADC (10-bit, 8-channel), PWM (16-channel), TIM, I²C, and sync processor for video timing applications. It operates at up to 20 MHz bus frequency and supports low-power Wait/Stop modes.

For engineers reviewing the MC908BD48IBE datasheet, MC908BD48IBE pinout, MC908BD48IBE application, or MC908BD48IBE equivalent, this page delivers verified technical context, package mapping, functional specifications, and real-world use cases in embedded control, industrial monitoring, and display interface systems.

Technical Context

The MC908BD48IBE implements the HCS08 CPU core with enhanced BDM debug support, a System Integration Module (SIM) for clock/reset management, and dedicated peripherals including a full-speed USB 1.1 transceiver (12 Mbps), 10-bit ADC with 8 analog inputs, and a Sync Processor for H/V sync polarity detection and clamp pulse generation.

It integrates a Multi-Master IIC Interface (MMIIC), DDC12AB for monitor communication, Pulse Width Modulator with 16 independent channels, and Timer Interface Module with input capture/output compare - all operating under a single 20 MHz bus clock derived from internal or external oscillator sources.

Key Specifications

Pinout & Package

MC908BD48IBE 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. Pin assignments follow Freescale's standard HCS08 BD48 layout per Section 1.5 of Rev. 2.1 datasheet.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MC908JB16CP and S9KEAZ128AMLH, the MC908BD48IBE uniquely integrates USB 1.1, DDC12AB, and hardware Sync Processor-enabling single-chip display interface and video timing solutions not achievable with either alternative without external components or significant firmware overhead.

Availability

MC908BD48IBE is available at Aetrix Electronics and suitable for industrial motor control, embedded display interface, video timing generation, and programmable power sequencing requiring stable component supply and long-term manufacturability.

Supply support for MC908BD48IBE 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 mobile applications, with deep heritage in microcontroller innovation through its acquisition of Freescale.

The MC908BD48IBE belongs to the HCS08 family, designed specifically for cost-sensitive, mixed-signal embedded systems requiring integrated USB, analog sensing, motor control, and video timing capabilities in a single 8-bit MCU.

FAQ

What is the maximum operating frequency of the MC908BD48IBE?

The MC908BD48IBE supports a maximum bus frequency of 20 MHz, achieved using an internal PLL or direct crystal oscillator input (1–8 MHz). This frequency governs instruction execution, peripheral timing, and USB frame generation. The HCS08 core executes most instructions in 1–3 bus cycles, enabling deterministic real-time response in control loops and timing-critical applications.

Does the MC908BD48IBE include a hardware USB transceiver?

Yes, the MC908BD48IBE integrates a full-speed USB 1.1 transceiver compliant with USB Specification Rev. 1.1. It supports 12 Mbps data rates, suspend/resume detection, and endpoint buffer management-all without requiring external PHY components. USB_DP and USB_DM pins connect directly to the USB connector with appropriate series resistors and ESD protection.

Can the MC908BD48IBE perform analog-to-digital conversion while in low-power mode?

Yes, the MC908BD48IBE's ADC can operate during Wait mode, allowing background analog sampling without CPU wake-up. However, it is disabled in Stop mode. Conversion completion triggers an interrupt, enabling event-driven firmware design. The ADC supports configurable sample time and reference selection (VDD or external VREFH), ensuring accuracy across varying supply conditions.

What debugging interface does the MC908BD48IBE support?

The MC908BD48IBE supports Background Debug Mode (BDM) via a single-wire serial interface (BKGD pin), enabling non-intrusive program download, breakpoint setting, register inspection, and real-time variable monitoring without halting system clocks or affecting peripheral operation.

Is the MC908BD48IBE pin-compatible with other HCS08 devices in the BDxx family?

No-while the MC908BD48IBE shares the 44-pin QFP (case 824A) package with some BDxx variants, pin functions differ significantly across memory sizes and peripheral sets. For example, MC908BD32 and MC908BD48 have distinct ADC channel mappings and USB pin allocations. Always verify pin assignments against the specific device's datasheet before PCB layout.