NXP Semiconductors MC908EY16CFAE

Overview

MC908EY16CFAE from Freescale Semiconductor is an 8-bit HCS08-core microcontroller with 16 KB on-chip Flash, 512 B RAM, and integrated analog peripherals including a 10-bit ADC (8 channels), BEMF counter, and ESCI/SPI/UART serial interfaces. It operates at up to 8 MHz bus frequency and supports motor control, appliance sensing, and industrial I/O applications.

For engineers reviewing the MC908EY16CFAE datasheet, MC908EY16CFAE pinout, MC908EY16CFAE application, or MC908EY16CFAE equivalent, key selection criteria include its internal clock generator with DCO trim capability, low-voltage inhibit (LVI) reset threshold of 2.5 V, COP watchdog timeout range of 1.7–27 ms, and 40-pin SOIC package compatibility for cost-sensitive embedded designs.

Technical Context

The MC908EY16CFAE implements the HCS08 CPU core with 16 MB linear address space, 8-level hardware stack, and indexed addressing modes. Its Internal Clock Generator (ICG) integrates a digitally controlled oscillator (DCO), modulo-N divider, and frequency comparator for precise clock synthesis without external crystals.

Peripheral integration includes a 10-bit ADC with programmable conversion time (16–256 µs), BEMF counter for brushless DC motor commutation timing, and dual serial interfaces (ESCI and SPI) supporting full-duplex synchronous/asynchronous communication. All modules support Wait and Stop low-power modes with configurable wake-up sources.

Key Specifications

Pinout & Package

MC908EY16CFAE is housed in a 40-pin SOIC (Small Outline Integrated Circuit) package with 32 general-purpose I/O pins distributed across Ports A–E, plus dedicated power, oscillator, reset, and serial interface pins.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MC908EY16CFBE and MC908EY8CFAE, the MC908EY16CFAE delivers optimal balance of Flash capacity (16 KB), SOIC packaging convenience, and full peripheral feature set-making it ideal for mid-complexity embedded control where layout simplicity and memory headroom are both critical.

Availability

MC908EY16CFAE is available at Aetrix Electronics and suitable for motor control systems, home appliance controllers, and industrial sensor nodes requiring stable component supply and long-term production support.

Supply support for MC908EY16CFAE 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.

The MC908EY16CFAE belongs to the HCS08 family, designed specifically for cost-sensitive, low-power embedded control applications requiring integrated analog peripherals and robust system supervision features.

FAQ

What is the maximum operating frequency of the MC908EY16CFAE?

The MC908EY16CFAE supports a maximum bus frequency of 8 MHz, derived from its internal clock generator (ICG) with digitally controlled oscillator (DCO). This frequency sets the upper limit for instruction execution speed and peripheral timing, and is achievable across the full 2.7–5.5 V supply range and −40°C to +85°C temperature range per datasheet specifications.

Does the MC908EY16CFAE include a hardware watchdog timer?

Yes, the MC908EY16CFAE includes a Computer Operating Properly (COP) watchdog module with a configurable timeout range from 1.7 ms to 27 ms. The COP uses an independent clock source and can be enabled/disabled via the COPCTL register. It resets the device upon timeout unless refreshed by firmware, providing critical fault recovery in safety-aware embedded systems.

Can the MC908EY16CFAE operate without an external crystal?

Yes, the MC908EY16CFAE can operate without an external crystal by using its internal Digitally Controlled Oscillator (DCO) as the system clock source. The DCO is factory-trimmed and further adjustable via the ICG Trim Register, enabling stable operation from 1–8 MHz with ±2% accuracy over voltage and temperature - sufficient for most UART, ADC, and motor control timing requirements.

What analog input capabilities does the MC908EY16CFAE provide?

The MC908EY16CFAE integrates a 10-bit successive-approximation ADC with eight single-ended input channels (AD0–AD7), programmable conversion time (16–256 µs), and selectable left/right justification. It supports ratiometric measurements using dedicated VREFH/VREFL pins and requires separate analog ground (VSSA) to maintain accuracy under mixed-signal conditions.

Is the MC908EY16CFAE pin-compatible with other members of the EY series?

Yes, the MC908EY16CFAE is pin-compatible with the MC908EY8CFAE (8 KB Flash variant) and shares identical 40-pin SOIC footprint and signal mapping. However, it is not pin-compatible with the MC908EY16CFBE, which uses a 44-pin QFP package despite identical functionality - requiring PCB layout changes for substitution.