NJU3504FA1 查看數據表（PDF） - Japan Radio Corporation

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NJU3504FA1

4-BIT SINGLE CHIP MICRO CONTROLLER

Japan Radio Corporation  

NJU3504

s INPUT OUTPUT PORT

The NJU3504 prepares 25 Input-Output lines and 10 dual-function lines for the interface to an external

application circuit. All lines are assigned to each Peripheral Register.

Data reading operation from the peripheral register can input the actual signals through the input

terminal. Data writing operation to the peripheral register can output the actual signals through the output

terminal.

[PORT FUNCTION TABLE]

PORT NAME

FUNCTION

INPUT/OUTPUT

PORTA, PORTB

Input / Output port

Programmable Input / Output PORT(4-bit).

PORTC − PORTH

PORTI

PORTJ(PJ0)

PORTJ(PJ1)

Input / Output port

Input port or AIN0 − AIN3

Input port or VREF

Input port or ADCK

Input / Output selectable ports by the mask option.

Input

Input

Input

PORTK(PK0)

Input port or EXTI

Input

PORTK(PK1)

Input port or CNTI

Input

PORTL(PL0)

Output Port or SDO

Output

PORTL(PL1)

Input / Output port or SDI(O) Input / Output selectable ports by the mask option.

Note1) PORTG is not prepared on the NJU3504L(SDIP package).

Note2) Pull-up resistance is selected by the mask option.(refer !INPUT OUTPUT TERMINAL TYPE)

(1) INPUT OUTPUT PORT

• PORTA(PA0 − PA3)

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

programmable input/output control register(PHY29) is set to “1”, and is set as the input when LSB of

PHY29 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 PORTA(PHY17). PHY17 as the output

register should be written the output data before the PORTA is set as the output by PHY29, because the

conditions of the output terminals are unknown while the output data is not written in PHY17. When this

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

reading data from PHY17. PHY17 can be written or read independent of the state of PHY29 as the input

or output.

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.

PORTA is set as the input in accordance with the state of PHY29 set to “0” on the “RESET” operation.

[READING PORTA INPUT DATA (PHY17)]

(MSB) 3

2

1

0

PHY17

PA3

PA2

PA1 PA0

(LSB)

PORTA Input Data

[WRITING PORTA OUTPUT DATA (PHY17)]

(MSB) 3

2

1

0

PHY17 PA3 PA2 PA1 PA0

(LSB)

PORTA Output Data

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