NT6868C
NT6868C is Keyboard Controller manufactured by Novatek.
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-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 only requires an externally applied or a 4MHz ceramic resonator, and a watch-dog timer that has a resistor preventing system standstill.
Pin Configuration
Pad Configuration
P 1 7 P 1 6 P 1 5 P 1 4 P 1 3 P 1 2 P 1 1 P 1 0 P 0 7 P 0 6
GND NC DATA CLK P30 P31 P32 P33 P34 RESET P00 P01 P02 P03 P04 P05 P06 P07 P10 P11
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25 24 23 22 21
OSCI R/OSCO V DD LED2 LED1 LED0 P27 P26 P25 P24 P23 P22 P21 P20 P17 P16 P15 P14 P13 P12
16 15
P05 P04 P03 P02 P01 P00 RESET P34 P33 P32
P20 P21 P22 P23 P24 P25 P26 P27 LED0 LED1
27 28 29 30 31 32 33 34 35 36 37 38 39 40 1 2 3 4 5
14 13 12 11 10 9 8 7
NT6868CH
P31
L E D 2
R / O S C O
P 3...
