NJU3502L データシートの表示（PDF） - Japan Radio Corporation

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NJU3502L

4-BIT SINGLE CHIP MICRO CONTROLLER

Japan Radio Corporation  

NJU3502

• PORTB(PB0 − PB3)

PORTB is a 4-bit programmable input-output PORT. It is set as the output when LSB of the

programmable input/output control register(PHY12) is set to “1”, and is set as input when LSB of PHY12

is set to “0”. When the PORT is set as the output, the 4-bit signals are output through the output

terminals by writing data into the peripheral register assigned for PORTB(PHY7). PHY7 as the output

register should be written the output data before the PORTB is set as the output by PHY12, because the

conditions of the output terminals are unknown while the output data is not written in PHY7. When this

PORT is set as the input, the 4-bit external signals are gotten directly through the input terminals by

reading data from PHY7. PHY7 can be written or read independent of the state of PHY12 as the input or

output.

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

therefore when the middle revel voltage between VDD and VSS is input, the operating current of the chip will

increase by through type current.

PORTB is set as the input in accordance with the state of PHY12 set to “0” on the “RESET” operation.

[READING PORTB INPUT DATA (PHY7)]

(MSB) 3

2

1

0

PHY7 PB3 PB2 PB1 PB0

(LSB)

PORTB Input Data

[WRITING PORTB OUTPUT DATA (PHY7)]

(MSB) 3

2

1

0

PHY7 PB3 PB2 PB1 PB0

(LSB)

PORTB Output Data

• PORTC(PC0 − PC3)

PORTC is a 4-bit input-output PORT. The input or the output is selected for each bit by the mask

option. When the port is set as the output, the signal is output through the output terminal by writing data

to the PORTC register(PHY8). When the port is set as the input, the external signal is gotten directly

through the input terminal by reading data from PHY8.

[READING PORTA INPUT DATA (PHY8)]

(MSB) 3

2

1

0

PHY8 PC3 PC2 PC1 PC0

(LSB)

[WRITING PORTA OUTPUT DATA (PHY8)]

PORTC Input Data

(MSB) 3

2

1

0 (LSB)

PHY8 PC3 PC2 PC1 PC0

PORTC Output Data

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