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

s INPUT OUTPUT PORT

The NJU3502 prepares 14 Input-Output lines and 3 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.

[FUNCTION OF EACH PORT TABLE]

PORT NAME FUNCTION

INPUT/OUTPUT

PORTB

Input / Output port

Programmable Input / Output PORT (4-bit).

PORTA

PORTC

PORTD

Input / Output port

Input / Output selectable ports by the mask option.

PORTE

Input port or EXTI

Input

PORTF(PF0) Output port or SDO

output

PORTF(PF1) Input / Output port or SDI(O) Input / Output selectable ports by the mask option.

Note) 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 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

PORTA register(PHY6). When the port is set as the input, the external signal is gotten directly through

the input terminal by reading data from PHY6.

[READING PORTA INPUT DATA (PHY6)]

(MSB) 3

2

1

0 (LSB)

PHY6 PA3 PA2 PA1 PA0

PORTA Input Data

[WRITING PORTA OUTPUT DATA (PHY6)]

(MSB) 3

2

1

0 (LSB)

PHY6 PA3 PA2 PA1 PA0

PORTA Output Data

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