NT68P62-01 Datasheet, PDF(23/56 Page) List of Unclassifed Manufacturers – 8-Bit Microcontroller for Monitor (32K OTP ROM Type)

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NT68P62-01 Datasheet, PDF (23/56 Pages) List of Unclassifed Manufacturers – 8-Bit Microcontroller for Monitor (32K OTP ROM Type)

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NT68P62-01

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', act as input pin. When programmed as an input, it has an internal pull-up resistor. When programmed as an output,

the data to be output is latched to the port data register and output to the pin with push-pull structure. This port acts as input

port after reset.

Addr.

$0002

$0003

$0010

$0029

PT2DIR

PT2

ENADC

CH1CON

INIT

FFH

Bit7

P27OE

P27

CSTA

ENDDC

Bit6

P26OE

P26

MD1/ 2

Bit5

P25OE

P25

SRW

Bit4

P24OE

P24

START

Bit3

P23OE

P23

ENADC3

STOP

Bit2

P22OE

P22

ENADC2

RXACK

Bit1

Bit0

R/W

P21OE

P21

P20OE

P20

ENADC1 ENADC0

TXACK

12.4. PORT3: P30 - P31

PORT3 is an 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 output, the data to be output is latched to the port data register

and output to the pin. When PORT3 pins that have '1's written to them, users must connect PORT3 with external pulled-up

resistor and then PORT3 can be used as input (the input signal can be read). This port output HIGH after reset.

P30 P31 include Schmitt Trigger buffers for noise immunity and can be configured as the I2C pins SDA0 & SCL0

respectively. If set ENDDC to LOW in CH0DDC control register, P30 P31 will act as SDA0 & SCL0 I/O pins respectively

and will be an open drain structure (Figure 12.6). After the chip is reset, this ENDDC bit will be in HIGH state and PORT3

will act as I/O pins.