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PDF NT6868A Data sheet ( Hoja de datos )
| Número de pieza | NT6868A | |
| Descripción | Keyboard Controller | |
| Fabricantes | Novatek | |
| Logotipo |  |
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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
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 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
LED1
35
36
37 38 39 40 1
2345
6 P31
L V R OG
E D / SN
D DO CD
2 SI
C
O
NDCP
CAL 3
TK0
A
1 V2.1
1 page  
NT6868A
Timing Generation
This block generates the system timing and control
signal supplied to CPU and on-chip peripherals. There
are two types of system clock sources: built-in RC
oscillator or external ceramic resonator. Both of them are
mask optional and generate a 4MHz system clock. They
also generates 2MHz for CPU, and 1MHz for base timer.
The following shows the relationship of code type
number and oscillation type.
Oscillator Type
RC OSC
Ceramic Resonator
Code Number
1
3
The following table provides the relationship between
external resistor and RC OSC frequency. (for reference
only)
External Resistor
(KΩ )
39
43
47
56
RC OSC Frequency (MHz)
4.7
4.44
4
3.68
Base Timer
The base timer is an 8-bit counter with a 1MHz clock source. The base timer can be enabled/disabled by CPU. After reset,
the base timer is disabled and cleared. The base timer can be preset by writing BT7 - BT0 to the BT register at any time.
When enabled, the base timer starts counting from the preset value. When the value reaches FFH, it generates a timer
interrupt if the timer interrupt is enabled. When it reaches the maximum value of FFH, the base timer will wrap around and
begin counting at 00H. The timer interval can be programmed from 1 - 256 µsec. The base timer can be enabled by writing
a '0' to ' ENBT ' in the TCON (Timer Control) register. The ENBT is a level trigger.
Base timer structure:
1µs
8-Bit timer
BT7 BT6 BT5 BT4 BT2 BT2 BT1 BT0
TMRINT
BT pre-load data:
Addr.
$00C0
Bit
BT
Timer Control Regisrer:
7654321
0
BT7 BT6 BT5 BT4 BT3 BT2 BT1 BT0 (W)
$00C1 TCON
-
-
-
-
-
-
- ENBT (W)
INT. Controller
When BASE TIMER overflow occurs, it will set the IRQTMR flag. The IRQTMR flag cannot be directly accessed by
software. Once set by an interrupt source, it remains High unless cleared by writing '1' to the corresponding bit in
CLRIRQX ($00C2H). This register is cleared to '0' on initialization by system reset.
When an interrupt occurs, CPU jumps to $FFFEH & $FFFFH to execute the interrupt service routine. When BASE TIMER
interrupt occurs and enters the interrupt service routine, the IRQTMR flag must be cleared by software.
Interrupt Control Register:
Addr.
$00C2
Bit 7 6 5 4 3 2 1
0
CLRIRQX - - - - - - - CLRIRQTMR (W)
5
5 Page 
NT6868A
Key Matrix definition for Windows 2000 Standard Code
Pause
126
Power
163
Sleep
164
R-Ctrl
64
Q
17
Tab
16
A
31
Esc
110
Z
46
W
18
Caps Lock
30
S
32
(K45)
45
X
47
E
19
F3
114
D
33
F4
115
C
48
R
20
T
21
F
34
G
35
V
49
U
23
Y
22
J
37
H
36
M
52
I
24
}
28 ]
K
38
F6
117
<
53 ,
O
25
F7
118
L
39
>
54 .
P
26
{
27 [
:
40 ;
"
41 '
|
42 \
Scroll Lock
125
L-Alt
60
(K14)
14
Back Space
|
F11
15 29 \ (101) 122
Enter
43
7
91 (Home)
4
92 (
)
1
93 (End)
Space
61
Num Lock
90
8
96 ( )
5
97 (Num)
2
98 ( )
0
99 (Ins)
/
95 (Num)
96
101 (Page Up) 102 (
)
3.
103 (Page Dn) 104 (Del)
*
100 (Num)
+
106 (Num)
Wake Up
165
(K107)
107
L-Shift
44
Enter
108 (Num)
R-Shift
57
83
Media
Previous
181
Media
180 Next
Media Stop
182
Volume -
186
Kor_L
134
L-Win
160
WWW
Forward
191
Media
Select
195
WWW Mail
187
R-Win
161
Calculator
196
WWW
Search
188
WWW Stop
192
My
Computer
197
WWW
Home
189
WWW
Refresh
193
Wake Up
165
(K131)
131
(K132)
132
(K133)
133
B
50
N
51
(K56)
56
App
162
?
55 /
R-Alt
62
F12
123
84
89
-
105 (Num)
79
Media Play
183
WWW
Bookmark
194
L-Ctrl
58
~
1`
F1
112
F2
113
%
65
^
76
+
13 =
F8
119
_
12 -
F9
120
Delete
76
Insert
75
Page Up
85
Home
80
Media Mute
184
F5
116
!
21
@
32
#
43
$
54
&
87
*
98
(
10 9
)
11 0
Print
124Screen
F10
121
Power
163
Sleep
164
Page Down
86
End
81
Volume +
185
WWW Back
190
Kor_R
135
S0
S1
S2
S3
S4
S5
S6
S7
S8
S9
S10
S11
S12
S13
S14
S15
S16
S17
S18
11
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet NT6868A.PDF ] | |
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