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NT6868C Datasheet

  • NT6868C

  • Keyboard Controller

  • 15頁

  • ETC

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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
碌sec
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
26
25
24
23
22
21
20
19
18
17
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
NT6868C
NT6868CH
6
P31
L
E
D
2
V
D
D
R
/
O
S
C
O
O
S
C
I
G
N
D
N
C
D
A
T
A
C
L
K
P
3
0
1
V2.0

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