NT6868A Datasheet, PDF (1/14 Pages) List of Unclassifed Manufacturers – Keyboard Controller

NT6868A
Keyboard Controller
Features
n Built-in 6502 8-bit CPU
n 2 MHz CPU operation frequency
n 4K bytes of ROM
n 128 bytes of SRAM
n 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 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
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.
Pin Configuration
Pad Configuration
GND
1
NC
2
DATA
3
CLK 4
P30 5
P31 6
P32 7
P33 8
P34 9
RESET 10
P00 11
P01 12
P02
13
P03 14
P04 15
P05 16
P06 17
P07 18
P10 19
P11
20
40 OSCI
39
R/OSCO
38
VDD
37
LED2
36
LED1
35
LED0
34
P27
33
P26
32
P25
31
P24
30
P23
29
P22
28
P21
27
P20
26
P17
25
P16
24
P15
23
P14
22
P13
21
P12
PPPPPPPPPP
1111111100
7654321076
26 25 24 23 22 21 20 19 18 17
16
P05
15
P04
P20
27
14
P03
P21
28
13
P02
P22
29
12
P01
P23
30
P24
31
NT6868AH
11
P00
10
RESET
P25
32
9
P34
P26
33
8
P33
P27
34
7
P32
LED0
35
LED1
36
37 38 39 40 1
2345
6
P31
L V R OG
E
D
/
SN
D
D
O
C
D
2
S
I
C
O
NDCP
CAL 3
TK0
A
1
V2.1