87L88EB

Technical Summary: COP87L88EB/COP87L89EB Microcontroller

Overview

The COP87L88EB/COP87L89EB is an advanced 8-bit microcontroller from National Semiconductor, designed for embedded control applications requiring robust communication interfaces and low-power operation. Built on a fully static CMOS architecture, this microcontroller integrates a rich set of peripherals, including CAN bus support, multi-channel ADC, and versatile timers, making it suitable for automotive, industrial, and consumer applications. Its OTP EPROM and RAM provide flexible program storage, while power-saving modes enhance energy efficiency.

Key Features

• CAN Bus Interface: Enables robust communication in automotive and industrial networks with software-controlled power-saving modes.
• 8-Bit A/D Converter: 8-channel ADC for analog signal acquisition.
• Fully Buffered UART: Supports asynchronous serial communication.
• Multi-Input Wake-Up (MIWU): Wake-up capability on Ports L and M for low-power applications.
• SPI Master/Slave Interface: Compatible with Serial Peripheral Interface for peripheral expansion.
• Memory: 8KB OTP EPROM with security lock and 192 bytes RAM.
• Timers: Two 16-bit timers with PWM, event counter, and input capture modes.
• Watchdog & Clock Monitor: Enhances system reliability.
• MICROWIRE/PLUS™ Serial I/O: For synchronous communication.
• I/O Flexibility: Memory-mapped I/O with configurable options (push-pull, TRI-STATE®, etc.).
• Power Management: HALT and IDLE modes for reduced current consumption (~1 mA typical).
• Packaging: 44-PLCC (31 I/O) and 68-PLCC (58 I/O) options.

Applications

The COP87L88EB/COP87L89EB is ideal for:

• Automotive Systems: CAN-based control modules, body electronics.
• Industrial Automation: Sensor interfaces, motor control, and PLCs.
• Consumer Electronics: Smart appliances, power management.
• Embedded Networking: Gateway devices, communication hubs.

Electrical Characteristics

• Supply Voltage: 4.5V to 5.5V (single supply).
• Operating Temperature: -40°C to +85°C.
• Power Consumption: Typically under 1 mA in active mode; ultra-low in HALT/IDLE.
• Clock Speed: 1 µs instruction cycle time (1 MHz equivalent).
• I/O Specifications: Schmitt trigger inputs on Ports G, L, M; configurable drive strength.

CPU & Instruction Set

• Architecture: 8-bit with 14 vectored interrupts.
• Interrupt Sources: External, timers (T1/T2), CAN (3x), UART (2x), MIWU, and software traps.
• Stack & Pointers: 8-bit stack pointer (RAM-based), two 8-bit indirect memory pointers (B, X).
• Instruction Set: Optimized for control tasks with efficient addressing modes.

Peripheral Details

Timers

• Timer Modes: PWM, event counting, and input capture.
• Resolution: 16-bit for precision timing.

Communication Interfaces

• UART: Full-duplex with buffering to reduce CPU overhead.
• SPI/MICROWIRE: Configurable as master or slave.
• CAN: Hardware-accelerated messaging with dedicated interrupts.

Analog-to-Digital Converter

• Channels: 8 single-ended inputs.
• Resolution: 8-bit for basic sensor interfacing.

Development Support

National Semiconductor provides comprehensive tools for the COP87L88EB, including:

• Emulation: COP888EB-compatible emulation devices.
• Debugging: MetaLink Development System for real-time emulation and program debug.
• Software Libraries: Drivers for CAN, SPI, and other peripherals.

Package Information

• 44-Pin PLCC: 31 I/O pins, compact footprint.
• 68-Pin PLCC: 58 I/O pins, expanded connectivity.
• Thermal & Mechanical: Industrial-grade packaging with robust thermal performance.

Block Diagram Overview

The device's block diagram highlights its integrated architecture, featuring:

• Central 8-bit CPU core with memory interfaces.
• Peripheral modules (timers, ADC, UART) connected via internal buses.
• Power management unit controlling HALT/IDLE transitions.
• I/O ports with Schmitt triggers and configurable options.

Conclusion

The COP87L88EB/COP87L89EB microcontroller combines communication versatility, analog integration, and low-power operation in a robust 8-bit platform. Its CAN bus support and development ecosystem make it a compelling choice for demanding embedded applications. With multiple package options and a wide temperature range, it addresses both cost-sensitive and high-reliability designs.