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NJU3151 Datasheet(PDF) 3 Page - New Japan Radio

Part No. NJU3151
Description  4-BIT SINGLE CHIP OTP TINY CONTROLLER
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Maker  NJRC [New Japan Radio]
Homepage  http://www.njr.co.jp/index_e.htm
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 3 page
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NJU3151
- 3 -
s TERMINAL DESCRIPTION IN OTP PROGRAMMING MODE
No.
SYMBOL
INPUT/OUTPUT
F U N C T I O N
9
RESET
INPUT
RESET terminal.
When the low-level input-signal, the system is initialized.
1 - 4,
10 - 13,
D0 - D7
INPUT/OUTPUT Data bus
14,
CNT1
INPUT
15
CNT2
INPUT
OTP control input terminal
7
REQ
OUTPUT
Request output terminal
6
CLK
INPUT
Clock input terminal
5
PROM
INPUT
OTP programming enable terminal
16
VDD
-
Power Source (5V)
8
VSS
-
Power Source (0V)
Note 1)
Use at VDD=5V in OTP programming mode.
2)
Non connect anything to the other terminals.
s Difference between NJU3151 (OTP version) and NJU3101 (MASK version)
q
Operating mode
NJU3151 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 NJU3151 operates in normal.
[ TIMING CHART ]
Option information setting
1/fOSCx256clock
Oscillator
Clock
RESET
Normal
Operation
Oscillation
Stability
Time
Oscillation
Start
PC=0000H
fOSC=4MHz
about 64
µsec




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