NJU3552 查看數據表（PDF） - Japan Radio Corporation

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NJU3552

4-BIT SINGLE CHIP OTP MICRO CONTROLLER

Japan Radio Corporation  

NJU3552

s TERMINAL DESCRIPTION IN OTP PROGRAMMING MODE

No.

SYMBOL INPUT/OUTPUT

FUNCTION

13

2 - 4,

7,

15 - 17,

21

22,

23

11

10

9

24

12

RESET

INPUT

RESET terminal.

When the low-level input-signal, the system is initialized.

D0 - D7 INPUT/OUTPUT Data bus

CNT1

CNT2

REQ

CLK

PROM

VDD

VSS

INPUT

INPUT

OUTPUT

INPUT

INPUT

-

-

OTP control input terminal

Request output terminal

Clock input terminal

OTP programming enable terminal

Power Source (5V)

Power Source (0V)

Note 1) Use at VDD=5V in OTP programming mode.

2) Non connect anything to the other terminals.

s Difference between NJU3552 (OTP version) and NJU3502 (MASK version)

q Operating mode

NJU3552 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 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 256clock after

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

the NJU3552 operates in normal.

[ TIMING CHART ]

Oscillation

Stability

Time

Option information setting

1/fOSCx256clock

Normal

Operation

Oscillator

Clock

Oscillation

Start

PC=0000H

RESET

fOSC=4MHz

about 64µsec

-3-

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