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NJU3555

4-BIT SINGLE CHIP OTP MICRO CONTROLLER

Japan Radio Corporation  

NJU3555

q Reset Terminal Type

Internal Pull-up Resistance

NJU3555

With Pull-up

NJU3505

Without Pull-up

q Option information set in the initialization

When the initialization is performed(RESET terminal is “L”), the operation information stored in option area is

set as shown in the following timing chart . The option information is set in the term of 1 / fOSC x 512clock after

RESET releasing and oscillation stability time. After information set, the program counter is set to 0000H and

the NJU3555 operates in normal.

[ TIMING CHART ]

Oscillator

Clock

Oscillation

Stability

Time

Option information setting

1/fOSCx512clock

Normal

Operation

Oscillation

Start

PC=0000H

RESET

fOSC=4MHz

about 128µsec

-5-

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