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

• PORTD(PD0, PD1)

PORTD is a 2-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 PORTD register(PHY9). When the port is set as the input, the external signal is gotten directly

through the input terminal by reading data from the PHY9. When this PORTD is set as the input, these

two ports perform the extra functions as follows:

a) PD0 TERMINAL

PD0 terminal performs the extra function as the re-start signal input terminal to return from the

"STANDBY" mode. When the rising edge of the signal from the external circuit is input into the PD0

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

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

b) PD1 TERMINAL

PD1 terminal performs the extra function as the edge detector terminal. When the PD1 terminal

detects the edge of the signal from the external circuit, the third bit(b2) condition of PHY9 is set to "1". The

“b2” of PHY9 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 PHY9.

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

[READING PORTD INPUT DATA (PHY9)]

(MSB) 3

2

1

PHY9 “0” PD1E PD1

0 (LSB)

PD0

PORTD Input Data

1 : PD1 detected an edge

[WRITING PORTD OUTPUT DATA (PHY9)]

(MSB) 3

PHY9

−

2

1

0 (LSB)

−

PD1 PD0

PORTD Output Data

• PORTE(PE0)

PORTE is a 1-bit input PORT. It operates also as EXTI input terminal for the external interrupt input by

the mask option. When the PORTE is set as the input PORT, the external signal is gotten directly from

the input terminal by reading data from the PHY10.

[READING PORTE INPUT DATA (PHY10)]

(MSB) 3

2

1

0 (LSB)

PHY10 “0”

“0”

“0” PE0

PORTE Input Data

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