Overview
The LC66354C, LC66356C, and LC66358C are 4-bit CMOS microcontrollers that integrate on a single chip all the functions required in a system controller, including ROM, RAM, I/O ports, a serial interface, comparator inputs, three-value inputs, timers, and interrupt functions. These three microcontrollers are available in a 42-pin package.

FEATUREs and Functions
• On-chip ROM capacities of 4, 6, and 8 kilobytes, and an on-chip RAM capacity of 512 × 4 bits.
• Fully supports the LC66000 Series common instruction set (128 instructions).
• I/O ports: 36 pins
• 8-bit serial interface: two circuits (can be connected in cascade to form a 16-bit interface)
• Instruction cycle time: 0.92 to 10 µs (at 2.5 to 5.5 V)
    — For the earlier LC66358A Series: 1.96 to 10 µs (at 3.0 to 5.5 V) and 3.92 to 10 µs (at 2.2 to 5.5 V)
    — For the earlier LC66358B Series: 0.92 to 10 µs (at 3.0 to 5.5 V)
• Powerful timer functions and prescalers
    — Time limit timer, event counter, pulse width measurement, and square wave output using a 12-bit timer.
    — Time limit timer, event counter, PWM output, and square wave output using an 8-bit timer.
    — Time base function using a 12-bit prescaler.
• Powerful interrupt system with 8 interrupt factors and 8 interrupt vector locations.
    — External interrupts: 3 factors/3 vector locations
    — Internal interrupts: 5 factors/5 vector locations
• Flexible I/O functions Comparator inputs, three-value inputs, 20-mA drive outputs, 15-V high-voltage pins, and pull-up/open-drain options.
• Optional runaway detection function (watchdog timer)
• 8-bit I/O functions
• Power saving functions using halt and hold modes.
• Packages: DIP42S, QIP48E (QFP48E)
• Evaluation LSIs
    — LC66599 (evaluation chip) + EVA85/800-TB6630X
    — LC66E308 (on-chip EPROM microcontroller) used together.