NT6880 Datasheet, PDF (1/13 Pages) List of Unclassifed Manufacturers – Keyboard Controller

NT6880
Features
T Built-in 6502 8-bit CPU
T 2 MHz CPU operation frequency
T 5K bytes of ROM
T 160 bytes of SRAM
T One 8-bit programmable base timer with
1 - 256 µsec interval
T 29 programmable bi-directional I/O pins
T 3 LED direct sink pins
Keyboard Controller
T Mask optional for built-in RC oscillator with an
external resistor or external ceramic resonator applied
T Mask optional for DATA/CLK driving capability
T Watch-dog timer reset
T Built-in power-on reset
T Built-in low voltage reset
T CMOS technology for low power consumption
T Available in 40 pin DIP package and 40 pad Chip
Form
General Description
The NT6880 is a single chip micro-controller for
keyboard applications. It incorporates a 6502 8-bit CPU
core, 5K bytes of ROM and 160 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 requiring an
externally applied resistor or a 4MHz ceramic resonator
and a watch-dog timer that prevents system standstill.
Pin 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
Pad Configuration
PPPPPPPPPP
1
1
1
1
1
1
1
1
0
0
7
6
5
4
3
2
1
0
7
6
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
NT6880H
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
2
3
4
5
6
P31
L
V
R
O
G
E
D
/
SN
D
D
O
C
D
2
S
I
C
O
NDCP
C
A
L
3
TK0
A
1
V1.0