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NT6881 Datasheet

  • NT6881

  • USB Keyboard Micro-Controller

  • 23頁

  • ETC

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NT6881
USB Keyboard Micro-Controller
Features
n
Built-in
6502
8-bit CPU
n
3 MHz CPU operation frequency when oscillator is
running at 6 MHz
n
6K bytes of ROM
n
256 bytes of SRAM
n
One 8-bit programmable base timer with pre-divider
circuit
n
29 programmable bi-directional I/O pins including two
external interrupts
n
n
n
n
n
n
n
n
n
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 Endpoints provided
Remote Wakeup provided
CMOS technology for low power consumption
40-pin DIP package, 42-pad Chip Form and COB
General Description
The NT6881 is a single chip micro-controller for USB
keyboard applications. It incorporates a 6502 8-bit CPU
core, 6K bytes of mask 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, it includes a built-in power-on reset, a built-
in low voltage reset, an oscillator that requires crystal or
ceramic resonator applied, and a watch-dog timer that
prevents system standstill.
Pin Configuration
Pad Configuration
V
D
P
V
C
P
G
N
D
G
N
D
O
S
C
I
42
O
S
C
O
41
V
C
C
V
C
C
38
40
39
37
VDM
5
36
35
P30
P31
P32
P33
P34
RESET
P00
P01
P02
P03
6
34
7
33
P25
P24
P23
P22
P21
P20
P17
8
9
10
30
11
29
12
28
13
27
14
16
15
17
18
19
20
21
22
23
24
25
26
P26
LED2
LED1
LED0
P27
GND
VCP
VDP
VDM
P30
P31
INT0/P32
INT1/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
OSCO
V
DD
LED2
LED1
LED0
P27
P26
P25
P24
P23
P22
P21
P20
P17
P16
P15
P14
P13
P12
4
3
2
1
NT6881
NT6881H
32
31
P
0
4
P
0
5
P
0
6
P
0
7
P
1
0
P
1
1
P
1
2
P
1
3
P
1
4
P
1
5
P
1
6
1
V2.6

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