[NOVATEK]

General Description

NT6868A is a single chip micro-controller for keyboard applications. It incorporates a 6502 8-bit CPU core, 4K bytes of ROM, and 128 bytes of RAM used as working RAM and stack area. It also includes 29 programmable bi-directional I/O pins and one 8-bit pre-loadable base timer. Additionally, it includes a built-in low voltage reset, a 4MHz RC oscillator that requires only a resistor externally applied or a 4MHz ceramic resonator, and a watch-dog timer that prevents system standstill.

Features

■ Built-in 6502 8-bit CPU

■ 2 MHz CPU operation frequency

■ 4K bytes of ROM

■ 128 bytes of SRAM

■ One 8-bit programmable base timer with 1 - 256 msec interval

■ 29 programmable bi-directional I/O pins

■ 3 LED direct sink pins with internal serial resistors

■ Mask optional for built-in RC oscillator with an external resistor or external ceramic resonator applied

■ Watch-dog timer

■ Built-in power-on reset

■ Built-in low voltage reset

■ CMOS technology for low power consumption

■ Available in 40 pin DIP package and 40 pad CHIP FORM