參數(shù)資料
型號(hào)： NT68F62
廠商： Electronic Theatre Controls, Inc.
英文描述： 8-Bit Microcontroller for Monitor (32K Flash MTP Type)
中文描述： 8位微控制器的監(jiān)視器（32K閃存中期型）
文件頁(yè)數(shù)： 23/57頁(yè)
文件大?。?/td> 521K
代理商： NT68F62
NT68F62
23
12.3. PORT2: P20 - P27
PORT2, an 8-bit bi-directional I/O port (Figure 12.5), may be programmed as an input or output pin by the software control.
When setting the PT2DIR control bit to '0', its correspondent pin will act as an output pin. On the other hand, clear PT2DIR
bit to '1'and it will act as an input pin. When programmed as an input pin, it has an internal pull-up resistor. When
programmed as an output pin, the data to be output is latched to the port data register and output to the pin with a push-pull
structure. This port acts as an input port after reset.
Addr.
Register
INIT
Bit7
Bit6
Bit5
Bit4
Bit3
Bit2
Bit1
Bit0
R/W
$0002
PT2DIR
FFH
P27OE
P26OE
P25OE
P24OE
P23OE
P22OE
P21OE
P20OE
W
$0003
PT2
FFH
P27
P26
P25
P24
P23
P22
P21
P20
RW
$0010
ENADC
FFH
CSTA
―
―
―
ENADC3
ENADC2
ENADC1
ENADC0
W
$0029
CH1CON
FFH
ENDDC
MD1/
2
SRW
START
STOP
RXACK
TXACK
―
RW
12.4. PORT3: P30 - P31
PORT3 is a 2 bit bi-directional open-drain I/O port (Figure 12.6). Each pin of Port3 may be bit programmed as an input or
output port with open drain structure. When Port3 works as an output pin, the data to be output is latched to the port data
register and output to the pin. When Port3 pins have '1's written to them, users must connect PORT3 with the external
pulled-up resistor and then PORT3 can be used as an input (the input signal can be read). This port output is hiGH after
reset.
P30
、
P31 include Schmitt Trigger buffers for noise immunity and can be configured as the IIC pins SDA0 & SCL0
respectively. If
ENDDC
is set to LOW in the CH0DDC control register, P30
、
P31 will act as SDA0 & SCL0 I/O pins
respectively and will be of an open drain structure (Figure 12.6). After the chip is reset, this
ENDDC
bit will be in the HIGH
state and PORT3 will act as I/O pin.
Addr.
Register
INIT
Bit7
Bit6
Bit5
Bit4
Bit3
Bit2
Bit1
Bit0
R/W
$0004
PT3
FFH
―
―
―
―
―
―
P31
P30
RW
$0024
CH0CON
FFH
ENDDC
MD1/
2
SRW
START
STOP
RXACK
TXACK
―
RW
I/O
Data Out
Data In
Figure 12.6. PORT3
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