NXP Semiconductors MC908AP16ACBE

Overview

MC908AP16ACBE 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), TIM, and TBM modules. It operates at up to 8 MHz bus frequency, supports 2.7–5.5 V supply, and targets embedded control in industrial sensors, motor drives, and appliance subsystems.

For engineers reviewing the MC908AP16ACBE datasheet, MC908AP16ACBE pinout, MC908AP16ACBE application, or MC908AP16ACBE equivalent, this page delivers verified technical context, package mapping, functional pin roles, real-world use cases, and validated alternative options for design-in and sourcing decisions.

Technical Context

The MC908AP16ACBE 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 bus clock synthesis from internal RC or external crystal sources, enabling precise timing control across variable load conditions.

System integration includes a System Integration Module (SIM) managing reset sources (POR, LVI, COP), interrupt prioritization (IRQ, KBI, SCI, TIM), and low-power modes (Wait/Stop). The ADC supports software- or timer-triggered conversions with configurable sample time and reference selection (VDD or internal bandgap).

Key Specifications

Pinout & Package

MC908AP16ACBE is housed in a 44-pin QFP (Quad Flat Package) with 0.8 mm pitch and exposed thermal pad. Pin assignments follow the MC68HC908AP A-family standard layout per Rev. 3 datasheet, Chapter 1.4.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MC908AP32ACBE and MC908AP8ACBE, the MC908AP16ACBE offers optimal balance of code capacity, cost, and footprint for mid-complexity embedded controllers-avoiding flash overprovisioning while retaining headroom for feature expansion.

Availability

MC908AP16ACBE is available at Aetrix Electronics and suitable for industrial sensor nodes, smart appliance control, BLDC motor drivers, and building automation controllers requiring stable component supply and long-term manufacturability.

Supply support for MC908AP16ACBE 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 8-bit MCU architectures for cost-sensitive, high-reliability embedded systems.

The MC68HC908AP A-family, including MC908AP16ACBE, was designed for industrial and consumer control applications demanding integrated analog peripherals, robust reset supervision, and in-field programmability.

FAQ

What is the maximum operating frequency of the MC908AP16ACBE?

The MC908AP16ACBE supports a maximum bus frequency of 8 MHz, derived from its internal PLL or direct oscillator source. 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 temperature; full 8 MHz operation is guaranteed across the entire 2.7–5.5 V range per the Rev. 3 datasheet, Section 22.5.

Does the MC908AP16ACBE support in-system programming (ISP)?

Yes, the MC908AP16ACBE supports in-system programming via its built-in monitor ROM. Using the SCI interface and standard monitor mode commands (e.g., PRGRNGE, ERARNGE), firmware can be updated without removing the device from the PCB. This capability is fully implemented in the MC908AP16ACBE and requires no external hardware programmer-only a UART connection and host-side utility compatible with Freescale's HCS08 monitor protocol.

What are the key differences between MC908AP16ACBE and MC908AP16ACP?

The MC908AP16ACBE and MC908AP16ACP share identical core functionality, memory size, and peripheral sets but differ in packaging and temperature grade. The 'BE' suffix denotes a 44-pin QFP package rated for –40°C to +85°C industrial operation, while 'CP' indicates a 44-pin PLCC package with the same temperature range. Pinouts are electrically identical, but mechanical mounting and reflow profiles differ-QFP requires fine-pitch SMT assembly, whereas PLCC supports socketing or wave soldering.

How does the ADC module in the MC908AP16ACBE handle reference voltage selection?

The MC908AP16ACBE ADC supports two reference voltage options: the external VDD supply or an internal 1.25 V bandgap reference. Selection is controlled via the ADCCFG register's REFSEL bit. Using VDD provides ratiometric measurement with sensors tied to the same supply; selecting the internal reference enables stable, supply-independent conversions critical for precision analog sensing. Both references are internally buffered to minimize loading effects on the source.

Is the MC908AP16ACBE pin-compatible with other members of the AP family?

Yes, the MC908AP16ACBE is pin-compatible with MC908AP8ACBE, MC908AP32ACBE, and MC908AP64ACBE within the same 44-pin QFP package variant. All share identical pin functions, electrical characteristics, and register maps-differences are limited to Flash/RAM size and associated fuse settings. This allows scalable design reuse: a single PCB layout can accommodate multiple AP-family variants by adjusting firmware and mask options.