Introduction
The MC68HC11KA4 family of microcontrollers are enhanced derivatives of the MC68HC11F1 and, as shown in the block diagram, include many additional features. The family includes the MC68HC11KA0, MC68HC11KA1, MC68HC11KA3, MC68HC11KA4, MC68HC711KA4, MC68HC11KA2, and the MC68HC711KA2. These MCUs, with a non-multiplexed expanded bus, are 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
• 768 Bytes RAM in MC68HC11KA4, 1024 Bytes RAM in MC68HC11KA2 (Saved During Standby)
• 640 Bytes Electrically Erasable Programmable ROM (EEPROM)
• 24 Kbytes ROM/EPROM, 32 Kbytes ROM/EPROM in MC68HC11KA2
• PROG Mode Allows Use of Standard EPROM Programmer (27256 Footprint)
• Non-multiplexed Address and Data Buses
• Enhanced 16-Bit Timer with Four-Stage Programmable Prescaler
    — Three Input Capture (IC) Channels
    — Four Output Compare (OC) Channels
    — One Additional Channel, Selectable as Fourth IC or Fifth OC
• 8-Bit Pulse Accumulator
• Four 8-Bit or Two 16-Bit Pulse-Width Modulation (PWM) Timer Channels
• Real-Time Interrupt Circuit
• Computer Operating Properly (COP) Watchdog
• 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 (Four Channels on 64-Pin Version)
• Seven Bidirectional Input/Output (I/O) Ports (43 Pins)
• One Fixed Input-Only Port (8 Pins, 4 Pins on 64-Pin Version)
• Available in 68-Pin Plastic Leaded Chip Carrier (Custom ROM/OTPROM), 68-Pin Windowed Ceramic Leaded Chip Carrier (EPROM), or 64-Pin Quad Flat Pack (Custom ROM/OTPROM)