Overview

The LC6514B is a microcontroller with FLT drivers. It is identical with the LC6510C in the internal architecture and instruction set. Since the normal/low-threshold level of input port A can be selected by option and the on-chip pulldown resistor can be bitwise connected to the FLT driver by option, the number of external parts used in the user equipment can be minimized, reducing the cost considerably.

Features

? Low power dissipation.

? ROM capacity : 4096×8 bits.

? RAM capacity : 256×4 bits.

? Subroutine stack : 8 levels (common with interrupt).

? On-chip OSC circuit

CR OSC : 800kHz typ.

Ceramic OSC : 400kHz, 800kHz, 1000kHz

External iuput : 1290kHz max.

? Power-down by 2 standby modes

HALT mode : Power dissipation saving by program stadby during normal operation

HOLD mode : Power supply backup during power failure.

? Input/output ports

Input : 4 bits × 1 port

3 bits × 1 port

Input/output : 4 bits × 2 ports

Output : 4 bits × 4 ports

2 bits × 1 port

? Interrupt.

External interrupt : 1

Internal timer interrupt : 1

? On-chip 4-bit prescaler and 8-bit program timer.

? Instruction cycle time : 3.1μs (at 1290kHz)

? Supply voltage

Normal operation : 4.0 to 6.0 V

Memory hold : 1.8 to 6.0 V

? Instruction set common to the LC6502, LC6505 (BANK instruction added)