NJU3102G 데이터 시트보기 (PDF) - Japan Radio Corporation

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NJU3102G

4-BIT SINGLE CHIP TINY CONTROLLER

Japan Radio Corporation  

NJU3102

• PORTB(PB0−PB3)

PORTB is a 4-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.

[READING PORTB INPUT DATA (PHY2)]

(MSB) 3

2

1

0

PHY2 PB3 PB2 PB1 PB0

(LSB)

[WRITING PORTB OUTPUT DATA (PHY2)]

(MSB) 3

2

1

0

PHY2 PB3 PB2 PB1 PB0

PORTB Input Data

(LSB)

PORTB Output Data

• PORTC(PC0, PC1)

PORTC is a 2-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.

When this PORTC is set as the input, these two ports perform the extra functions as follows:

a) PC0 TERMINAL

PC0 TERMINAL performs the extra function as the restart signal input terminal to return from the

"STANDBY" mode. When the rising edge of the signal from the external circuit is input into the PC0

terminal in mode of "STANDBY", the "STANDBY" mode is released and the CPU starts the execution

again from the suspended address of the program. (refer !STANDBY FUNCTION)

b) PC1 TERMINAL

PC1 TERMINAL performs the extra function as the edge detector terminal. When the PC1 terminal

detects the edge of the signal from the external circuit, the third bit(b2) condition of PHY3 is set to "1".

The “b2” of PHY3 is set to “1” even when the edge is input during the “STANDBY” mode. The condition

of “b2” is kept until the writing operation to PHY3.

The polarity as low to high or high to low of the input signal edge can be selected by the mask option.

[READING PORTC INPUT DATA (PHY3)]

(MSB) 3

2

1

PHY3

“0” PC1E PC1

0 (LSB)

PC0

PORTC Input Data

1 : PC1 edge detection

[WRITING PORTC OUTPUT DATA (PHY3)]

(MSB) 3

2

1

PHY3

–

–

PC1

0 (LSB)

PC0

PORTC Output Data

-9-

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