Overview

The LC87F7DC8A is an 8-bit microcomputer that, centered around a CPU running at a minimum bus cycle time of

83.3ns, integrates on a single chip a number of hardware features such as 128K-byte flash ROM (onboard

programmable), 4K-byte RAM, an on-chip debugger, a LCD controller/driver, sophisticated 16-bit timer/counter

(may be divided into 8-bit timers), a 16-bit timer/counter (may be divided into 8-bit timers/counters or 8-bit PWMs),

four 8-bit timers with a prescaler, a 16-bit timer with a prescaler (may be divided into 8-bit timers), a base timer

serving as a time-of-day clock, a day and time counter, a synchronous SIO interface (with automatic block

transmission/reception capabilities), an asynchronous/synchronous SIO interface, two UART ports (full duplex), an

12-bit 15-channel AD converter, two 12-bit PWM channels, a high-speed clock counter, a system clock frequency

divider, a small signal detector, two remote control receive functions, and a 31-source 10-vector interrupt feature.

Features

Flash ROM

• Capable of on-board-programming with wide range, 3.0 to 5.5V, of voltage source.

• Block-erasable in 2-byte units

• 131072 × 8 bits

RAM

• 4096 × 9 bits

Minimum Bus Cycle Time

• 83.3ns (12MHz) VDD=3.0 to 5.5V

• 125ns (8MHz) VDD=2.5 to 5.5V

• 250ns (4MHz) VDD=2.2 to 5.5V

Note: The bus cycle time here refers to the ROM read speed.