Description

This document contains a detailed description of the M68HC11 E series of 8-bit microcontroller units (MCUs). These MCUs combine the M68HC11 central processor unit (CPU) with high-performance, on-chip peripherals. The E series is comprised of many devices with various configurations of random-access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM), and electrically erasable programmable read-only memory (EEPROM). Some devices also operate at low voltages.

Specifications and features

• M68HC11 CPU
• Power-saving stop and wait modes
• Low-voltage devices available (3.0–5.5 Vdc)
• 0, 256, 512, or 768 bytes of on-chip RAM, data retained during standby
• 0, 12, or 20 Kbytes of on-chip ROM or EPROM
• 0, 512, or 2048 bytes of on-chip EEPROM with block protect for security
• 2048 bytes of EEPROM with selectable base address in the MC68HC811E2
• Asynchronous non-return-to-zero (NRZ) serial communications interface (SCI)
• Additional baud rates available on MC68HC(7)11E20
• Synchronous serial peripheral interface (SPI)
• 8-channel, 8-bit analog-to-digital (A/D) converter
• 16-bit timer system: Three input capture (IC) channels, four output compare (OC) channels, one additional channel selectable as fourth IC or fifth OC
• 8-bit pulse accumulator
• Real-time interrupt circuit
• Computer operating properly (COP) watchdog system
• 38 general-purpose input/output (I/O) pins: 16 bidirectional I/O pins, 11 input-only pins, 11 output-only pins
• Several packaging options: 52-pin plastic-leaded chip carrier (PLCC), 52-pin windowed ceramic leaded chip carrier (CLCC), 52-pin plastic thin quad flat pack (TQFP), 64-pin quad flat pack (QFP), 48-pin plastic dual in-line package (DIP, MC68HC811E2 only), 56-pin plastic shrink dual in-line package (SDIP)

Application Scenarios

The M68HC11 E series MCUs are widely used in various electronic applications that require control and processing capabilities. Some common application scenarios include:

• Industrial automation
• Robotics
• Home appliances
• Consumer electronics
• Automotive systems

Comparison

• High-performance CPU
• Wide range of on-chip memory options
• Low power consumption
• Multiple communications interfaces
• High-resolution analog-to-digital converter
• Flexible timer system
• Ample I/O pins for connectivity
• Various packaging options

• Requires knowledge of assembly language programming
• Limited processing power for complex tasks
• May require additional external components for certain applications