參數(shù)資料
型號(hào)： NT6868AH-0046
廠商： Electronic Theatre Controls, Inc.
英文描述： Keyboard Controller
中文描述： 鍵盤控制器
文件頁(yè)數(shù)： 7/14頁(yè)
文件大小： 205K
代理商： NT6868AH-0046
NT6868A
7
LED Port
There are 3 LED direct sink pins which require no external serial resistors. The address is mapped to address $00C9.
Addr.
$00C9
Bit
LED
7
-
6
-
5
-
4
-
3
-
2
1
0
LED2
LED1
LED0
(W)
SD
D
L
Q
WREN
DB
RST
LED [ 0 ]
SD
D
L
Q
WREN
DB
RST
V
DD
LED [ 1:2 ]
LED0
Port Structure
LED1, LED2 Port Structures
Watch-Dog Timer
NT6868A implements a watch-dog timer, which protects programs against system standstill. The clock of the watch-dog
timer is derived from the on-chip RC oscillator. The watch-dog timer interval is about 0.175 of a second. The timer must be
cleared within every 0.175 second during normal operation; otherwise, it will overflow and cause a system reset. The
watch-dog timer is cleared and enabled after a system reset. It cannot be disabled by software. The user can clear the
watch-dog timer by writing #55H to CLRWDT ($00CAH) register.
For example:
LDA
STA
Addr.
$00CA
#$55
$00CA
Bit
7
0
6
1
5
0
4
1
3
0
2
1
1
0
0
1
CLRWDT
(W)
Low Voltage Reset (LVR) Circuit
The NT6868A will check on the voltage level of power supply. When the voltage level of power supply is below a threshold
of 3.0V (Typical), the LVRC will issue a reset output to the chip until the power voltage level is above the threshold voltage
of 3.0V (Typical) again. As soon as the power voltage arises to 3.0V (Typical), the entire chip will be reset for about
150ms.
RESET
NT6868A can also be externally reset via
RESET
pin. A reset is initiated when the signal at the
RESET
pin is held Low
for at least 10 system clock. As soon as
RESET
signal goes high, the NT6868A begins to be reset for about 150ms. The
following shows the definition of
RESET
input low pulse width.
20%V
DD
20%V
DD
V
DD
Trstb
V
DD
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