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NJU3555

4-BIT SINGLE CHIP OTP MICRO CONTROLLER

Japan Radio Corporation  

NJU3555

s Difference between NJU3555 (OTP version) and NJU3505 (MASK version)

q Operating mode

NJU3555 has two operating modes. One is ”Normal operating mode” and the other is “OTP programming

mode”.

• Normal operating mode

The ”TEST” terminal is set to low level. (The terminal is recommended to connect to GND.)

Operating voltage range; 2.7V ~ 5.5V.

• OTP Programming mode

User program is read out from or written into the OTP by the universal programmer “SUPERPRO/L” and

converting adapter made by XELTEK co,.(USA).

q Programming memory (OTP)

The address location of programming memory (OTP) of NJU3555 is compatible with the masked ROM of

NJU3505, excepting the option area.

The option area is located in page 127(64bytes) in the following.

Program Area

Option Area

: Addresses 0000H ~ 1FBFH : 8,128bytes

: Addresses 1FC0H ~ 1FFFH : 64bytes

[ PROGRAM MEMORY AREA ]

(Addresses)

0000H

07FFH

0800H

Bank 0

Program Start Address

(Addresses in the bank)

0000H

Page 0

0040H

Page 1

0080H

Page 2

0FFFH

1000H

17FFH

1800H

Bank 1

Bank 2

0780H

07C0H

07FFH

Page 30

Page 31

Bank 0

Bank 3

1FFFH

Option area

1FC0H

1FFFH Page 127

(Addresses in the page)

00H

64 Instruction Words

3FH

∗ 8 Bits / Instruction Word

64 Instruction Words /Page

32 Pages / Bank

4 Banks / OTP

* In case of NJU3505,

Page127 is program area.

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