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NJU3554 Datasheet(PDF) 3 Page - New Japan Radio

Part No. NJU3554
Description  4-BIT SINGLE CHIP OTP MICRO CONTROLLER
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Maker  NJRC [New Japan Radio]
Homepage  http://www.njr.co.jp/index_e.htm
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NJU3554 Datasheet(HTML) 3 Page - New Japan Radio

 
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NJU3554
- 3 -
s TERMINAL DESCRIPTION IN OTP PROGRAMMING MODE
No.
NJU
3554F
NJU
3554L
SYMBOL
INPUT /
OUTPUT
F U N C T I O N
7
10
RESET
INPUT
RESET terminal.
When the low-level input-signal, the system is initialized.
25, 26,
28-31,
34, 35
28, 29,
31-34,
37, 38
D0 - D7
INPUT/OUTPUT Data bus
1
40,
CNT1
INPUT
2
41
CNT2
INPUT
OTP control input terminal
10
13
REQ
OUTPUT
Request output terminal
9
12
CLK
INPUT
Clock input terminal
8
11
PROM
INPUT
OTP programming enable terminal
18, 33
21, 36
VDD
-
Power Source (5V)
11, 12
14, 15
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 NJU3554 (OTP version) and NJU3504 (MASK version)
q
Operating mode
NJU3554 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
Reset Terminal Type
NJU3554
NJU3504
Internal Pull-up Resistance
With Pull-up
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 NJU3554 operates in normal.
[ TIMING CHART ]
Option information setting
1/fOSCx512clock
Oscillator
Clock
RESET
Normal
Operation
Oscillation
Stability
Time
Oscillation
Start
PC=0000H
fOSC=4MHz
about 128
µsec


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