Sigle-Chip Microcontrollers. UPD789479 Datasheet

UPD789479 Microcontrollers. Datasheet pdf. Equivalent

UPD789479 Datasheet
Recommendation UPD789479 Datasheet
Part UPD789479
Description 8 Bit Sigle-Chip Microcontrollers
Feature UPD789479; User’s Manual µPD789478 Subseries 8-Bit Single-Chip Microcontrollers µPD789477 µPD789478 µPD789479 µ.
Manufacture NEC
Datasheet
Download UPD789479 Datasheet




NEC UPD789479
User’s Manual
µPD789478 Subseries
8-Bit Single-Chip Microcontrollers
µPD789477
µPD789478
µPD789479
µPD78F9478
µPD78F9479
Document No. U15400EJ3V0UD00 (3rd edition)
Date Published May 2003 N CP(K)
Printed in Japan
©
2001



NEC UPD789479
[MEMO]
2 User’s Manual U15400EJ3V0UD



NEC UPD789479
NOTES FOR CMOS DEVICES
1 PRECAUTION AGAINST ESD FOR SEMICONDUCTORS
Note:
Strong electric field, when exposed to a MOS device, can cause destruction of the gate oxide and
ultimately degrade the device operation. Steps must be taken to stop generation of static electricity
as much as possible, and quickly dissipate it once, when it has occurred. Environmental control
must be adequate. When it is dry, humidifier should be used. It is recommended to avoid using
insulators that easily build static electricity. Semiconductor devices must be stored and transported
in an anti-static container, static shielding bag or conductive material. All test and measurement
tools including work bench and floor should be grounded. The operator should be grounded using
wrist strap. Semiconductor devices must not be touched with bare hands. Similar precautions need
to be taken for PW boards with semiconductor devices on it.
2 HANDLING OF UNUSED INPUT PINS FOR CMOS
Note:
No connection for CMOS device inputs can be cause of malfunction. If no connection is provided
to the input pins, it is possible that an internal input level may be generated due to noise, etc., hence
causing malfunction. CMOS devices behave differently than Bipolar or NMOS devices. Input levels
of CMOS devices must be fixed high or low by using a pull-up or pull-down circuitry. Each unused
pin should be connected to VDD or GND with a resistor, if it is considered to have a possibility of
being an output pin. All handling related to the unused pins must be judged device by device and
related specifications governing the devices.
3 STATUS BEFORE INITIALIZATION OF MOS DEVICES
Note:
Power-on does not necessarily define initial status of MOS device. Production process of MOS
does not define the initial operation status of the device. Immediately after the power source is
turned ON, the devices with reset function have not yet been initialized. Hence, power-on does
not guarantee out-pin levels, I/O settings or contents of registers. Device is not initialized until the
reset signal is received. Reset operation must be executed immediately after power-on for devices
having reset function.
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User’s Manual U15400EJ3V0UD
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