GENERAL DESCRIPTION
Zilogs Z86L78 is a low-voltage microcontroller, a member of the IR (Infrared) Family, with 16 KB of ROM and 493 bytes of general-purpose RAM. Manufactured in CMOS technology and offered in 20-pin DIP or SOIC styles packages, this cost-effective, low power consumption ROMbased device offers fast execution, efficient use of memory, sophisticated interrupts, input/output bit manipulation capabilities, automated pulse generation/reception, and easy hardware/software system expansion.
   
FEATURES
■ Low Power Consumption: 40 mW (Typical)
■ Three Standby Modes (Typical)
    – STOP - 2 µA
    – HALT - 0.8 mA
    – Low Voltage (<VLv)
■ Programmable Watch-Dog/Power-On Reset Circuits
■ All Digital Inputs are CMOS Levels
■ Five Priority Interrupts
    – Three External
    – Two Assigned to Counter/Timers
■ Two Independent Comparators with Programmable
    Interrupt Polarity
■ On-Chip Oscillator that Accepts a Crystal, Ceramic
    Resonator, LC, RC (Mask Selectable), or External Clock
    Drive
■ Mask Selectable Option to Enable 32 kHz Crystal
    Operation
■ Special Architecture to Automate Both Generation and
    Reception of Complex Pulses or Signals:
    – One Programmable 8-Bit Counter/Timer with Two
        Capture Registers
    – One Programmable 16-Bit Counter/Timer with
        One Capture Register
    – Programmable Input Glitch Filter for Pulse
        Reception
■ Mask-Selectable 200 KOhm Pull-Ups on Ports 0, 2, 3:
    – All Eight Port 2 Bits Individually Selected
    – Pull-Ups Automatically Disabled Upon Selecting
        an Output.