NJU3503L データシートの表示（PDF） - Japan Radio Corporation

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NJU3503L

4-BIT SINGLE CHIP MICRO CONTROLLER

Japan Radio Corporation  

NJU3503

• PORTB(PB0 − PB2)

PORTB is a 3-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

PORTB register (PHY18). When the port is set as the input, the external signal is gotten directly through

the input terminal by reading data from PHY18.

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

a. PB0 TERMINAL

PB0 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 PB0

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. PB1 TERMINAL

PB1 terminal performs the extra function as the edge detector terminal. When the PB1 terminal

detects the edge of the signal from the external circuit, the forth bit(b3) condition of PHY18 is set to "1".

The “b3” of PHY18 is set to “1” even when the edge is input during the “STANDBY” mode. The condition

of “b3” is kept until the writing operation to PHY18.

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

[ READING PORTB INPUT DATA (PHY18) ]

(MSB) 3

2

1

0 (LSB)

PHY18 PB1E PB2 PB1 PB0

PORTB Input Data

[ WRITING PORTB OUTPUT DATA (PHY18) ]

1 : PB1 detected an edge

(MSB) 3

2

1

0 (LSB)

PHY18 −

PB2 PB1 PB0

PORTB Output Data

• PORTC(PC0, PC1)

PORTC is a 2-bit input PORT. It operates also as VREF and ADCK terminals of the internal A/D

converter by the mask option. When the PORTC is set as the input PORT, the two external signals are

gotten directly through the input terminals by reading data from PHY19.

[ READING PORTD INPUT DATA (PHY20) ]

(MSB) 3

2

1

0

PHY19 “0”

“0” PC1 PC0

(LSB)

PORTC Input Data

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