Technical Summary: COP87L89EB Microcontroller

Overview

The COP87L89EB is an advanced 8-bit microcontroller from National Semiconductor, designed for embedded control applications requiring robust communication interfaces and low-power operation. It features a fully static CMOS design, offering high performance with minimal power consumption. The microcontroller integrates a CAN bus interface, an 8-bit A/D converter, a fully buffered UART, and multiple timer/capture modules, making it suitable for automotive, industrial, and consumer electronics applications.

Key Features

Core and Instruction Set

• 1 ms instruction cycle time for efficient processing
• Fourteen multi-sourced vectored interrupts for real-time responsiveness
• Versatile and easy-to-use instruction set
• 8-bit stack pointer (SP) with stack in RAM
• Two 8-bit Register Indirect Memory Pointers (B, X)

Memory

• 8096 bytes of on-board OTP EPROM with security feature
• 192 bytes of on-board RAM for data storage

Peripheral Features

• CAN bus interface with software power save mode
• 8-bit A/D Converter with 8 channels
• Fully buffered UART for serial communication
• Multi-input wake-up (MIWU) on Port L and M
• SPI-compatible Master/Slave Interface
• MICROWIRE/PLUS™ serial I/O

Timers and PWM

• Two 16-bit timers with multiple modes:
  • Processor-independent PWM mode
  • External Event counter mode
  • Input capture mode
• Programmable idle timer (T0)
• WATCHDOG™ and Clock Monitor for system reliability

I/O Capabilities

• Memory-mapped I/O
• Software-selectable I/O options:
  • TRI-STATE® outputs
  • Push-pull outputs
  • Weak pull-up input
  • High-impedance input
• Schmitt trigger inputs on Port G, L, and M for noise immunity

Power Management

• Low current drain (typically ≤ 1 mA)
• Two power-saving modes: HALT and IDLE
• Single supply operation: 4.5V to 5.5V
• Operating temperature range: -40°C to +85°C

Applications

The COP87L89EB is well-suited for a variety of embedded control applications, including:

• Automotive Systems: CAN bus communication, engine control modules, and sensor interfaces
• Industrial Automation: Motor control, PLCs, and data acquisition systems
• Consumer Electronics: Smart appliances, remote controls, and home automation
• Medical Devices: Portable monitoring equipment with low-power requirements
• Communication Devices: Serial data transmission and protocol conversion

Electrical Characteristics

Absolute Maximum Ratings

• Supply Voltage (V_CC): -0.3V to +7.0V
• Input Voltage (V_IN): -0.3V to V_CC + 0.3V
• Operating Temperature Range: -40°C to +85°C
• Storage Temperature Range: -65°C to +150°C

Recommended Operating Conditions

• Supply Voltage (V_CC): 4.5V to 5.5V
• Operating Temperature: -40°C to +85°C
• Clock Frequency: Up to 10 MHz (typical)

Power Consumption

• Active Mode: ≤ 1 mA (typical at 5V, 10 MHz)
• HALT Mode: < 1 µA (typical)
• IDLE Mode: < 100 µA (typical)

Package Information

The COP87L89EB is available in two package options:

• 44-Pin PLCC: 31 I/O pins, compact footprint for space-constrained designs
• 68-Pin PLCC: 58 I/O pins, ideal for applications requiring extensive peripheral connectivity

Pin Configuration (44-Pin PLCC)

The 44-pin PLCC package provides a balanced mix of I/O and power pins, including:

• Port G, L, and M with Schmitt trigger inputs
• Dedicated CAN bus interface pins
• UART transmit/receive lines
• SPI and MICROWIRE/PLUS™ communication pins
• Analog input channels (A/D converter)

Development Support

National Semiconductor provides comprehensive development tools for the COP87L89EB, including:

• Emulation Device: COP888EB for hardware prototyping
• MetaLink Development System: Enables real-time emulation and full program debugging
• Software Libraries: Pre-built drivers for CAN, SPI, and UART interfaces

Conclusion

The COP87L89EB microcontroller combines high-performance processing with low-power operation, making it an excellent choice for embedded systems requiring reliable communication and control. Its rich peripheral set, flexible I/O options, and robust development support ensure rapid deployment in demanding applications.