NJU3101 データシートの表示（PDF） - Japan Radio Corporation

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NJU3101

4-BIT SINGLE CHIP TINY CONTROLLER

Japan Radio Corporation  

NJU3101

• PORTB(PB0)

PORTB is a 1-bit input-output PORT. When the PORT is set as the output, the signal is output through

the output terminal by writing data to the PORTB register(PHY2). When the PORT is set as the input,

the external signal is gotten directly through the input terminal by reading data from PHY2.

Though the output circuit is Nch open drain type, the C-MOS input buffer is connected to the same

terminal. Therefore, the operating current of the chip by the short circuit current when the middle level

voltage between VDD and VSS is input to this terminal.

[READING PORTB INPUT DATA (PHY2)]

(MSB) 3

2

1

0 (LSB)

PHY2

“0”

“0”

“0” PB0

PORTB Input Data

[WRITING PORTB OUTPUT DATA (PHY2)]

(MSB) 3

2

1

0

PHY2

–

–

–

PB0

(LSB)

PORTB Output Data

• PORTC(PC0)

PORTC is a 1-bit input-output PORT. When the PORT is set as the output, the signal is output through

the output terminal by writing data to the PORTC register(PHY3). When the PORT is set as the input,

the external signal is gotten directly through the input terminal by reading data from PHY3.

Though the output circuit is Nch open drain type, the C-MOS input buffer is connected to the same

terminal. Therefore, the operating current of the chip by the short circuit current when the middle level

voltage between VDD and VSS is input to this terminal.

[READING PORTC INPUT DATA (PHY3)]

(MSB) 3

2

1

0

(LSB)

PHY3

“0”

“0”

“0” PC0

PORTC Input Data

[WRITING PORTC OUTPUT DATA (PHY3)]

(MSB) 3

2

PHY3

–

–

1

0 (LSB)

–

PC0

PORTC Output Data

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