NT68P81

 Built-in 6502C 8-bit CPU
 3 MHz CPU operation frequency when oscillator is running at 6 MHz
 6K bytes of OTP (one time programming) ROM
 256 bytes of SRAM
 One 8-bit programmable base timer with pre-divider circuit
 29 programmable bi-directional I/O pins including two external interrupts
 3 LED direct sink pins with internal serial resistors
 On-chip oscillator (Crystal or Ceramic Resonator)
 Watch-dog timer reset
 Built-in power-on reset
 USB interface
 3 supported endpoints
 Remote wakeup provided
 CMOS technology for low power consumption
 40-pin DIP package, 42-pad Dice form and COB

The NT68P81 is a single chip micro-controller for USB keyboard applications. It incorporates a 6502C 8-bit CPU core, 6K bytes of OTP ROM, and 256 bytes of RAM used as working RAM and stack area. It also includes 29 programmable bi-directional I/O pins with built-in resistors, and one 8-bit pre-loadable base timer.

Additionally, NT68P81 includes a built-in power-on reset, a builtin low voltage reset, an oscillator that requires crystal or ceramic resonator applied, and a watch-dog timer that prevents system standstill.