NJU3505L 查看數據表（PDF） - Japan Radio Corporation

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NJU3505L

4-BIT SINGLE CHIP MICRO CONTROLLER

Japan Radio Corporation  

NJU3505

• PORTH(PH0, PH1)

PORTH 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 PORTH register (PHY24). When the port is set as the input, the external signal is gotten directly

through the input terminal by reading data from PHY24. When this PORTH is set as the input, these two

ports perform the extra functions as follows:

a. PH0 TERMINAL

PH0 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 PH0

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. PH1 TERMINAL

PH1 terminal performs the extra function as the edge detector terminal. When the PH1 terminal

detects the edge of the signal from the external circuit, the third bit(b2) condition of PHY24 is set to

"1". The “b2” of PHY24 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 PHY24.

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

option.

[ READING PORTH INPUT DATA (PHY24) ]

(MSB) 3

PHY24

“0”

2

PH1E

1

PH1

0 (LSB)

PH0

PORTH Input Data

1 : PH1 detected an edge

[ WRITING PORTH OUTPUT DATA (PHY24) ]

(MSB) 3

PHY24

−

2

1

0 (LSB)

−

PH1 PH0

PORTH Output Data

• PORTI(PI0 − PI3)

PORTI is a 4-bit input PORT. It operates also as the multiplexed 4-channel analog signal input

terminals (AIN0 − AIN3) to the internal A/D converter by the mask option. When the PORTI is set as the

input PORT, the four external signals are gotten directly though the input terminals by reading data from

PHY25.

[ READING PORTI INPUT DATA (PHY25) ]

(MSB) 3

PHY25 PI3

2

1

0 (LSB)

PI2 PI1 PI0

PORTI Input Data

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