NXP Semiconductors MC908AP16ACFBE

Overview

MC908AP16ACFBE from Freescale Semiconductor is an 8-bit HCS08-core microcontroller with 16 KB on-chip Flash memory, 512 B RAM, and integrated peripherals including SCI, SPI, I²C, ADC (8-channel, 10-bit), and a 16-bit TIM module. It operates at up to 8 MHz bus frequency, supports 5 V operation, and targets embedded control in industrial sensors, motor drives, and appliance subsystems.

For engineers reviewing the MC908AP16ACFBE datasheet, MC908AP16ACFBE pinout, MC908AP16ACFBE application, or MC908AP16ACFBE equivalent, key selection criteria include its 48-pin LQFP package, internal voltage regulator (VREG), low-power stop/wait modes, and mask-programmable ROM-based monitor mode for in-system programming and debugging.

Technical Context

The MC908AP16ACFBE implements the HCS08 CPU core with enhanced addressing modes and a 16-level hardware stack. Its Clock Generator Module (CGM) integrates a PLL for flexible clock synthesis from internal RC or external crystal sources, enabling precise bus timing control across temperature and voltage ranges.

System integration includes a System Integration Module (SIM) managing reset sources (POR, LVI, COP), interrupt prioritization (IRQ, KBI, SCI, TIM), and power management. The ADC features programmable sample time and conversion trigger sources, while the TIM module supports input capture, output compare, and PWM generation with double-buffered registers.

Key Specifications

Pinout & Package

MC908AP16ACFBE is housed in a 48-pin LQFP (7 mm × 7 mm, 0.5 mm pitch) package with exposed thermal pad. Pin functions are defined per Chapter 1.4 (Pin Assignment) and 1.5 (Pin Functions) of the MC68HC908AP A-Family Data Sheet, Rev. 3.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MC908AP16ACFBE, the MC908AP32ACFBE offers scalable code storage while maintaining identical I/O and timing behavior, whereas the MC9S08AW16CFDE introduces CAN capability at the cost of package and pin compatibility - making it a functional alternative only in new designs requiring fieldbus integration.

Availability

MC908AP16ACFBE is available at Aetrix Electronics and suitable for industrial sensor nodes, home appliance control units, and motor drive subsystems requiring stable component supply, long-term lifecycle support, and consistent electrical performance across temperature extremes.

Supply support for MC908AP16ACFBE 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, delivering high-reliability microcontrollers and analog solutions for automotive, industrial, and consumer markets.

The MC908AP16ACFBE belongs to the HCS08-based AP-family, designed specifically for cost-sensitive, 5 V industrial control applications demanding robustness, integrated analog peripherals, and in-system programmability without external tools.

FAQ

What is the maximum operating frequency of the MC908AP16ACFBE?

The MC908AP16ACFBE supports a maximum bus frequency of 8 MHz, derived from its internal PLL or direct oscillator input. This frequency governs instruction execution speed, peripheral timing (e.g., SCI baud rate generation), and ADC conversion rate. The actual achievable frequency depends on supply voltage and ambient temperature, with full specification guaranteed across the industrial range (−40°C to +85°C) at 4.5–5.5 V.

Does the MC908AP16ACFBE include an internal voltage regulator?

Yes, the MC908AP16ACFBE integrates an on-chip voltage regulator (VREG) that generates a stable 3.3 V supply for the core logic from the main 5 V VDD rail. This eliminates the need for an external LDO in many applications and simplifies power design, though separate analog supply (VDDA/VSSA) is still required for the ADC and oscillator circuits.

How does the monitor mode function on the MC908AP16ACFBE?

The MC908AP16ACFBE implements a mask-programmable monitor ROM that enables in-system programming and debugging via the SCI interface. Entry is triggered by a break signal on RXD during reset, allowing firmware updates, memory reads/writes, and register inspection without external programming hardware - a key feature for field service and production programming.

What ADC capabilities does the MC908AP16ACFBE provide?

The MC908AP16ACFBE includes an 8-channel, 10-bit successive-approximation ADC with software-selectable reference (VDD or internal bandgap), programmable sample time, and multiple trigger sources (software, TIM overflow, SCI receive). Conversion results are stored in dedicated registers and support both single-ended and differential input configurations.

Is the MC908AP16ACFBE pin-compatible with other members of the AP-family?

Yes, the MC908AP16ACFBE shares identical 48-pin LQFP packaging and pinout with MC908AP32ACFBE and MC908AP64ACFBE. This allows direct substitution within the same footprint for firmware scaling - for example, upgrading from 16 KB to 32 KB Flash without PCB modification - provided configuration bits and memory map usage are aligned.