NXP Semiconductors MC908AP32CFBE

Overview

MC908AP32CFBE from Freescale Semiconductor is an 8-bit HCS08 microcontroller with 32 KB on-chip Flash memory, 1 KB RAM, and integrated peripherals including SCI, SPI, I²C, ADC (8-channel, 10-bit), and PWM-capable TIM module. It operates at up to 8 MHz CPU frequency using internal or external clock sources and targets embedded control in industrial sensors, motor drives, and appliance subsystems.

For engineers reviewing the MC908AP32CFBE datasheet, MC908AP32CFBE pinout, MC908AP32CFBE application, or MC908AP32CFBE equivalent, this page delivers verified technical context, package mapping (SOIC-52), functional pin assignments, real-world use cases, and validated alternative parts for design continuity and sourcing flexibility.

Technical Context

The MC908AP32CFBE implements the HCS08 CPU core with 16-bit address space, supporting indexed, extended, and relative addressing modes. Its Clock Generator Module (CGM) integrates a PLL for frequency multiplication and supports multiple clock sources - internal RC oscillator (1–8 MHz), crystal (1–8 MHz), or external clock input.

System-level integration includes a System Integration Module (SIM) managing reset, interrupts, low-power modes (Wait/Stop), and bus timing; plus dedicated modules for analog conversion (ADC with 500 kHz–1 MHz clock range), serial communication (SCI/I²C/SPI), and time-critical control (TIM with input capture, output compare, and PWM).

Key Specifications

Pinout & Package

MC908AP32CFBE is housed in a 52-pin SOIC (Small Outline Integrated Circuit) package with 40 usable I/O pins, 4 power/ground pins (VDD, VSS, VDDA, VSSA), and dedicated oscillator, reset, and programming pins. Pin functions are fully defined in Table 1-2 of the Rev. 4 datasheet.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MC908AP64CFBE, the MC908AP32CFBE provides identical peripheral functionality at lower Flash density and cost; versus MC9RS08KA8, it delivers significantly higher processing throughput, richer analog integration, and advanced clock management - making it the preferred choice for mid-tier embedded control requiring scalability and precision.

Availability

MC908AP32CFBE is available at Aetrix Electronics and suitable for industrial sensor nodes, appliance motor control, smart thermostat interfaces, and power supply supervisors requiring stable component supply across long-lifecycle production programs.

Supply support for MC908AP32CFBE 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 global leader in embedded processing solutions, specializing in automotive, industrial, and consumer microcontrollers with robust analog and mixed-signal integration.

The MC908AP32CFBE belongs to the HCS08-based MC68HC908AP family, designed specifically for cost-sensitive, resource-constrained embedded control applications demanding Flash programmability, analog sensing, and real-time responsiveness in harsh environments.

FAQ

What is the maximum operating frequency of the MC908AP32CFBE?

The MC908AP32CFBE supports a maximum CPU frequency of 8 MHz, achievable using either the internal RC oscillator (calibrated to ±2% over temperature), an external crystal (1–8 MHz), or an external clock source. The Clock Generator Module (CGM) includes a PLL for frequency multiplication, enabling stable high-speed operation while maintaining low EMI through controlled slew rates and filtered clock paths. This frequency directly determines instruction throughput and real-time response capability in the MC908AP32CFBE.

Does the MC908AP32CFBE include a hardware watchdog timer?

Yes, the MC908AP32CFBE integrates a Computer Operating Properly (COP) watchdog timer with programmable timeout intervals ranging from 0.5 ms to 1.0 s. It is enabled by default after reset and requires periodic software servicing to prevent system reset. The COP module uses an independent RC oscillator, ensuring reliable operation even if the main system clock fails. This feature is essential for fail-safe behavior in the MC908AP32CFBE deployed in unattended industrial equipment.

Can the MC908AP32CFBE perform in-system programming without external hardware?

Yes, the MC908AP32CFBE contains a Monitor ROM (MON) that enables in-system programming and debugging via its built-in SCI interface. Using standard UART commands, users can erase, program, and verify Flash memory without requiring a dedicated programmer or debug probe. This capability simplifies field firmware updates and reduces development tooling costs for the MC908AP32CFBE in production and maintenance phases.

What analog-to-digital converter (ADC) capabilities does the MC908AP32CFBE provide?

The MC908AP32CFBE features an 8-channel, 10-bit successive-approximation ADC with programmable sample-and-hold timing and selectable reference voltages (VDD or internal bandgap). Its ADC clock must be set between 500 kHz and 1 MHz for optimal linearity and noise performance. Conversion results are accessible via memory-mapped registers and support both single-shot and continuous scan modes - critical for accurate sensor interfacing in the MC908AP32CFBE.

Is the MC908AP32CFBE pin-compatible with other members of the MC68HC908AP family?

Yes, the MC908AP32CFBE shares the same 52-pin SOIC package and pinout with MC68HC908AP64CFBE, MC68HC908AP16CFBE, and MC68HC908AP8CFBE. This allows hardware design reuse across memory variants - for example, a PCB designed for MC908AP32CFBE can accept MC908AP64CFBE without layout changes. However, firmware must be validated for Flash size and peripheral configuration differences when migrating between variants of the MC908AP32CFBE family.