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PDF UPD75P068CU Data sheet ( Hoja de datos )

Número de pieza UPD75P068CU
Descripción 4 BIT SINGLE-CHIP MICROCOMPUTER
Fabricantes NEC 
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DATA SHEET
MOS INTEGRATED CIRCUIT
µPD75P068
4 BIT SINGLE-CHIP MICROCOMPUTER
The µPD75P068 is produced by replacing the internal mask ROM of the µPD75068 with a one-time PROM
in which data can be written once.
The following user's manual describes the details of the functions of the µPD75P068. Be sure to read it
before designing an application system.
µPD75068 User's Manual: IEU-1366
FEATURES
Compatible with the µPD75068
• Can be replaced with the µPD75068 containing mask ROM on a full-production basis.
Internal one-time PROM: 8064 words × 8 bits
Internal RAM: 512 words × 4 bits
Internal pull-up resistors can be specified with software: Ports 0 to 3 and 6
N-ch open-drain input-output: Ports 4 and 5
Can operate at low voltage: VDD = 2.7 to 6.0 V
ORDERING INFORMATION
Part number
µPD75P068CU
µPD75P068GB-3B4
Package
42-pin plastic shrink DIP (600 mil)
44-pin plastic QFP (Square 10 mm)
Quality grade
Standard
Standard
Caution The µPD75P068 is not provided with mask-selected pull-up resistors.
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-3290A
(O.D. No. IC-8623A
Date Published April 1994 P
Printed in Japan
The information in this document is subject to change without notice.
Major changes in this revision are indicated by stars (5) in the margins.
© NEC CORPORATIO1N9910993

1 page




UPD75P068CU pdf
µPD75P068
1. PIN FUNCTIONS
1.1 PORT PINS
Pin
P00
P01
P02
P03
P10
P11
P12
P13
P20
P21
P22
P23
P30Note 2
P31Note 2
P32Note 2
P33Note 2
P40-P43Note 2
P50-P53Note 2
P60
P61
P62
P63
P110
P111
P112
P113
Input/
output
Input
I/O
I/O
I/O
Input
I/O
I/O
I/O
I/O
I/O
Input
Shared pin
Function
INT4
SCK
SO/SB0
SI/SB1
INT0
INT1
INT2
TI0
PTO0
PCL
BUZ
MD0
MD1
MD2
MD3
KR0/AN4
KR1/AN5
KR2/AN6
KR3/AN7
AN0
AN1
AN2
AN3
4-bit input port (PORT0).
For P01-P03, pull-up resistors can be
provided by software in units of 3 bits.
With noise elimination function
4-bit input port (PORT1).
Pull-up resistors can be provided by
software in units of 4 bits.
4-bit I/O port (PORT2).
Pull-up resistors can be provided by
software in units of 4 bits.
Programmable 4-bit I/O port (PORT3).
I/O can be specified bit by bit.
Pull-up resistors can be provided by
software in units of 4 bits.
N-ch open-drain 4-bit I/O port (PORT4).
Withstand voltage of 10 V
Data input-output (low-order 4 bits) when
writing to and verifying program memory
(PROM)
N-ch open-drain 4-bit I/O port (PORT5).
Withstand voltage of 10 V
Data input-output (high-order 4 bits)
when writing to and verifying program
memory (PROM)
Programmable 4-bit I/O port (PORT6).
Pull-up resistors can be provided by
software in units of 4 bits.
4-bit input port (PORT11)
8 bit
I/O
×
×
×
×
q
×
×
I/O
When reset circuit
typeNote 1
B
Input
F -A
F -B
M -C
Input
B -C
Input
E-B
Input
E-B
High
Impedance
M-A
High
Impedance
M-A
Input
Y -D
Input
Y-A
Notes 1. The circle (q) indicates the Schmitt trigger input.
2. Can directly drive the LED.
5

5 Page





UPD75P068CU arduino
µPD75P068
3.2 WRITING TO THE PROGRAM MEMORY
The procedure for writing to program memory is described below; high-speed write is possible.
(1) Connect all unused pins to VSS through resistors. Apply a low-level signal to the X1 pin.
(2) Apply 5 V to VDD and VPP pins.
(3) Wait 10 µs.
(4) Select program memory address clear mode.
(5) Apply +6 V to VDD and +12.5 V to VPP.
(6) Select program inhibit mode.
(7) Select write mode for 1 ms duration and write data.
(8) Select program inhibit mode.
(9) Select verify mode. If write is successful, proceed to step (10). If write fails, repeat steps (7) to (9).
(10) Perform additional write for (Number (X) of repetitions of steps (7) to (9)) × 1 ms duration.
(11) Select program inhibit mode.
(12) Increment the program memory address by inputting four pulses on the X1 pin.
(13) Repeat steps (7) to (12) until the last address is reached.
(14) Select program memory address clear mode.
(15) Apply 5 V to VDD and VPP pins.
(16) Turn the power off.
The timing for steps (2) to (12) is shown below.
Repeat X times
Write
Verify
Additional write
Address
increment
VPP
VPP
VDD
VDD +1
VDD
VDD
X1
P40-P43
P50-P53
MD0
(P30)
MD1
(P31)
MD2
(P32)
MD3
(P33)
Data input
Data output
Data input
11

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