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1 Features . M68HC11 CPU . Power Saving STOP and WAIT Modes . 768 Bytes RAM (AlI Saved During Standby) . 24 Kbytes ROM or EPROM . 640 Bytes Electrically Erasable Programmable Read Only Memory (EEPROM) . Optional Security Feature Protects Memory Contents . On-Chip Memory Mapping Logic Allows Expansion to Over l Mbyte of Address Space . PROG Mode Allows Use of Standard EPROM Programmer (27C256 Footprint) . Nonmultiplexed Address and Data Buses . Four Programmable Chip Selects with Clock Stretching (Expanded Modes) . Enhanced 16-Bit Timer with Four-Stage Programmable Prescaler - Three Input Capture (lC) Channels - Four Output Compare (OC) Channels - One Additional Channel, Selectable as Fourth lC or Fifth QC . 8-Bit Pulse Accumulator . Four 8-Bit or Tw0 16-Bit Pulse Width Modulation (PWM) Timer Channels . Real-Time Interrupt Circuit . Computer Operating Properly (COP) Watchdog . Clock Monitor . Enhanced Asynchronous Nonreturn to Zero (NRZ) Serial Communications Interface (SCI) . Enhanced Synchronous Serial Peripheral Interface (SPI) . Eight-Channel 8-Bit Analog-to-Digital (A/D) Converter . Seven Bidirectional Input/Output (I/O) Ports (54 Pins) . One Fixed Input-Only Port (8 Pins) . Available in 84-Pin Plastic Leaded Chip Carrier (PLCC), 84-Pin Windowed Ceramic Leaded Chip Carrier (CLCC), and 80-Pin Quad Flat Pack (QFP)