com NT6868C Keyboard Controller Features n n n n n 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 µsec interval n 29 programmable bi-directional I/O pins n 3 LED direct sink pins with internal serial resistors n Mask optional for built-in RC oscillator with an external resistor or external ceramic resonator applied n Mask optional for DATA/CLK driving capability n Watch-dog timer n Built-in power-on reset n Built-in low voltage reset n CMOS technology for low power consumption n Available in 40 pin DIP package and 40 pad CHIP FORM General Description NT6868C is a single chip micro-contro...

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