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PDF UPD75402 Data sheet ( Hoja de datos )

Número de pieza UPD75402
Descripción 4 BIT SINGLE-CHIP MICROCOMPUTER
Fabricantes NEC 
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DATA SHEET
MOS INTEGRATED CIRCUIT
µPD75402A(A)
4 BIT SINGLE-CHIP MICROCOMPUTER
The µPD75402A(A) is a CMOS single-chip microcomputer which uses the 75X series architecture. It operates
at high speed with a minimum instruction execution time of 0.95 µs.
The µPD75P402 is also available for system development evaluation. It contains one-time PROM instead
of mask ROM used in the µPD75402A(A).
The following user's manual describes the details of the functions of the µPD75402A(A). Be sure to read
it before designing an application system.
µPD75402A User's Manual: IEU-644
FEATURES
More reliable than the µPD75402A
High-speed operation with a minimum instruction execution time of 0.95 µs (when the microcomputer
operates at 4.19 MHz)
Low voltage and low-speed instruction execution time of 15.3 µs (when the microcomputer operates at
4.19 MHz)
Memory mapping by on-chip peripheral hardware
NEC standard serial bus interface (SBI)
8-bit basic interval timer (watchdog timer applicable)
Interrupt function
• Three vectored interrupts (one external and two internal interrupts)
• One external test input
Clock output function (remote controller output applicable)
Capable of specifying the incorporation of 16 pull-up resistors by software
APPLICATIONS
Electronic units for automobiles, and suchlike
ORDERING INFORMATION
Part number
µPD75402AC(A)-×××
µPD75402ACT(A)-×××
µPD75402AGB(A)-×××-3B4
Package
28-pin plastic DIP (600 mil)
28-pin plastic shrink DIP (400 mil)
44-pin plastic QFP (10 × 10 mm)
Quality grade
Special
Special
Special
Remark ××× indicates the ROM code number.
Please refer to "Quality Grades on NEC Semiconductor Devices" (Document number IEI-1209) published by
NEC Corporation to know the specification of quality grade on the devices and its recommended applications.
Document No. IC-2841B
(O.D.No. IC-8273B)
Date Published November 1993 P
Printed in Japan
The information in this document is subject to change without notice.
Major changes in this revision are indicated by stars ( ) in the margins.
©© NEC CORPORATIO1N19199901

1 page




UPD75402 pdf
44-pin plastic QFP (10 × 10 mm)
µPD75402A(A)
44 43 42 41 40 39 38 37 36 35 34
P30 1
33 P01/SCK
P31 2
32 P00
P32 3
NC 4
31 RESET
30 NC Note
VSS 5
29 NC
NC
6 µPD75402AGB(A)- ××× -3B4
28
NC
NC 7
27 NC
P33 8
P60 9
26 VDD
25 X1
P61 10
24 X2
NC 11
23 NC
12 13 14 15 16 17 18 19 20 21 22
Note When the µPD75402A(A) shares the printed circuit board with the µPD75P402, connect the NC pin
(pin 30) directly to the VSS pin.
5

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UPD75402 arduino
µPD75402A(A)
3.5 HANDLING UNUSED PINS
Pin
P00
P01 - P03
P10, P12
P20 - P23
P30 - P33
P50 - P53
P60 - P63
NC
Recommended connection method
Connected to the VSS pin
• When a pull-up resistor is contained
Connected to the VDD pin
• When a pull-up resistor is not contained
Connected to the VSS or VDD pin
• When a pull-up resistor is contained
Input mode : Connected to the VDD pin
Output mode : Open
• When a pull-up resistor is not contained
Input mode : Connected to the VSS or VDD pin
Output mode : Open
Open or directly connected to the VSS pin Note
Note When the µPD75402A(A) shares the printed circuit board with the µPD75P402, connect the NC pin
directly to VSS pin.
3.6 NOTES ON USING THE P00 AND RESET PINS
The P00 and RESET pins have the test mode selecting function for testing the internal operation of the
µPD75402A(A) (IC test), besides the functions shown in Sections 3.1 and 3.2.
Applying a voltage exceeding VDD to the P00 and/or RESET pin causes the µPD75402A(A) to enter the test
mode. When noise exceeding VDD comes in during normal operation, the device is switched to the test mode.
For example, when the wiring from the P00 or RESET pin is too long, noise voltage induced on the wiring
is applied to the pin, driving the voltage at the pin above VDD, which may cause malfunction.
When installing the wiring, lay the wiring in such a way that noise is suppressed as much as possible. If
noise yet arises, use an external part to suppress it as shown below.
• Connect a diode with low VF (0.3 V or lower)
between the pin and VDD.
• Connect a capacitor between the pin and VDD.
VDD VDD
Diode with
low VF
VDD
P00, RESET
VDD
P00, RESET
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