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

s STANDBY FUNCTION

STANDBY FUNCTION halts the IC operation and reduces the current consumption.

The STANDBY function starts by the HLT instruction. After the HLT instruction execution cycle, the internal

oscillator operation is stopped and all of the operation is halted. In case of the external clock operation, the

clock is stopped automatically delivering into the internal system by the internal circuit, and all of the operation

is halted as same as the internal oscillator operation. This is STANDBY mode.

In the STANDBY mode, the operating current can be reduced. Though the clock into the internal system is

stopped and all of the operation is halted, all conditions of Program Counter, Registers, and data in RAM are

kept certainly.

Two ways to release from the STANDBY mode are prepared. One way is the reset operation that when the

reset signal is input to RESET terminal, the operation starts from the initial condition. The other way is the

restart operation that when the restart signal is input to PB0 terminal, the operation starts from the kept

Program Counter location which is the program address after the final operation. In case of the restart signal

operation, if the rising signal, low to high, is input to PB0 terminal, the internal oscillator circuit starts at first.

After the stabilized clock from the internal oscillator was counted eight times, the clock is started delivering into

the internal system. Then the NJU3503 starts to operate from the kept Program Counter location with all of

the kept conditions.(See *1)

In case of the external clock operation, the external clock must be started to supply to the OSC1 terminal

before the STANDBY mode is released. The external clock is recommended to stop supplying to the OSC1

terminal for reducing the power consumption during the STANDBY mode.

*1: When the restart signal is input to PB0 terminal to release the STANDBY mode, PORTB must be

selected as the input by the mask option.

[ STANDBY MODE TIMING CHART ]

Normal

Operation

STANDBY

Mode

Oscillation

Stability Time

Normal

Operation

Oscillator

Clock

System

Clock

Oscillation Start

Execute

HLT

Instruction

next instruction

Restart Signal

(PB0 Terminal)

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