INTRODUCTION
The MC68HC11F1 high-performance microcontroller unit (MCU) is an enhanced derivative of the M68HC11 family of microcontrollers and includes many advanced features. This MCU, with a nonmultiplexed expanded bus, is characterized by high speed and low power consumption. The fully static design allows operation at frequencies from 4 MHz to dc.

Features
• M68HC11 Central Processing Unit (CPU)
• Power Saving STOP and WAIT Modes
• 512 Bytes Electrically Erasable Programmable Read-Only Memory (EEPROM)
• 1024 Bytes RAM, Data Retained During Standby
• Nonmultiplexed Address and Data Buses
• Enhanced 16-Bit Timer
• 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
• Enhanced Asynchronous Nonreturn to Zero (NRZ) Serial Communications Inter face (SCI)
• Enhanced Synchronous Serial Peripheral Interface (SPI)
• Eight-Channel 8-Bit Analog-to-Digital (A/D) Converter
• Four Chip-Select Signal Outputs with Programmable Clock Stretching
   — Two I/O Chip Selects
   — One Program Chip Select
   — One General-Purpose Chip Select
• Available in 68-Pin Plastic Leaded Chip Carrier (PLCC) and 80-Pin Plastic Quad Flat Pack (QFP)