NXP Semiconductors S908EY16AE0CFJER

Overview

S908EY16AE0CFJER from Freescale Semiconductor is an 8-bit M68HC08 core microcontroller with 16 KB on-chip FLASH, 512 B RAM, and integrated ADC10 (10-bit, 8-channel), BEMF counter, ESCI, SPI, and dual timer modules. It operates from 2.7–5.5 V, supports internal/external clock sources up to 8 MHz, and targets motor control, appliance timing, and industrial sensor interface applications.

For engineers reviewing the S908EY16AE0CFJER datasheet, S908EY16AE0CFJER pinout, S908EY16AE0CFJER application, or S908EY16AE0CFJER equivalent, key selection criteria include FLASH security byte validation ($FFF6–$FFFD), ICG trimmable internal oscillator accuracy (±2% over temperature), 10-bit ADC sampling rate (up to 100 kSPS), and support for WAIT/STOP low-power modes with COP watchdog supervision.

Technical Context

The S908EY16AE0CFJER implements a Harvard-architecture M68HC08 CPU with 32-bit addressing, 16-bit index register, and 16-level hardware stack. Its Internal Clock Generator (ICG) integrates a digitally controlled oscillator (DCO), modulo-N divider, frequency comparator, and digital loop filter for stable internal clock synthesis.

FLASH memory includes mass/page erase, program/read, and block protection features; security enforcement requires eight user-defined bytes at $FFF6–$FFFD, and monitor mode entry is denied if ≥5 of those bytes are zero - a hardened anti-dump mechanism distinct from standard COP reset behavior.

Key Specifications

Pinout & Package

Package: 64-pin QFP (Quad Flat Package), 10 mm × 10 mm, 0.5 mm pitch, lead-free (Pb-free) and RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 8-bit microcontroller applications.

Compared with MC9RS08KA8CFD and S908QY4E0CDTE, the S908EY16AE0CFJER provides unique BEMF hardware acceleration, larger 16 KB FLASH for field-upgradable motor algorithms, and full 8-channel ADC - making it the only option among the three qualified for sensorless BLDC control in automotive-grade thermal environments.

Availability

S908EY16AE0CFJER is available at Aetrix Electronics and suitable for motor control, industrial sensor interface, appliance timing, and automotive body electronics requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for S908EY16AE0CFJER 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) designed high-reliability microcontrollers for automotive, industrial, and consumer applications with emphasis on robustness, mixed-signal integration, and long-term supply stability.

The M68HC08 product line - including the S908EY16AE0CFJER - was engineered for cost-sensitive, real-time embedded control tasks demanding analog integration, FLASH security, and operation across harsh thermal environments.

FAQ

What is the FLASH security mechanism implemented in the S908EY16AE0CFJER?

The S908EY16AE0CFJER enforces FLASH security by requiring a host to transmit eight user-programmed bytes stored at memory addresses $FFF6–$FFFD during monitor mode entry. If five or more of those bytes are zero, monitor mode access is denied - preventing unauthorized firmware readout. This mechanism operates independently of COP or reset vectors and must be configured before final programming.

Does the S908EY16AE0CFJER support external crystal oscillators?

Yes, the S908EY16AE0CFJER supports external crystal or ceramic resonator operation via PTC4/OSC1 and PTC3/OSC2 pins. The ICG module allows configuration for fundamental-mode crystals from 1 MHz to 8 MHz, with optional EXTXTALEN and OSCENINSTOP bits enabling crystal startup in STOP mode for wake-from-sleep timing precision.

What peripheral modules are integrated into the S908EY16AE0CFJER?

The S908EY16AE0CFJER integrates an ADC10 (10-bit, 8-channel), BEMF counter, ESCI (UART-compatible serial interface), SPI, dual timer modules (TIMA and TIMB), keyboard interrupt (KBI), low-voltage inhibit (LVI), and computer operating properly (COP) watchdog. All are accessible via shared port pins with priority-based multiplexing defined in the datasheet.

How does the Internal Clock Generator (ICG) of the S908EY16AE0CFJER achieve frequency stability?

The S908EY16AE0CFJER's ICG uses a digitally controlled oscillator (DCO) with factory-trimmed values stored in ICG Trim Registers. A digital loop filter and frequency comparator continuously adjust the DCO stage and divider to maintain ±2% accuracy from –40 °C to +125 °C - eliminating drift-related timing errors in closed-loop motor control without external components.

Can the S908EY16AE0CFJER operate in low-power modes while retaining critical state?

Yes, the S908EY16AE0CFJER supports WAIT mode (RAM retained, CPU halted, peripherals active) and STOP mode (RAM and CONFIG registers retained, all clocks stopped except optional crystal oscillator). Wake events include IRQ, KBI, ADC conversion complete, and BEMF edge detection - enabling ultra-low-power sensor polling or motor idle states.