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UPD7566AG Datasheet(PDF) 8 Page - NEC

Part # UPD7566AG
Description  4-BIT SINGLE-CHIP MICROCOMPUTER
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Manufacturer  NEC [NEC]
Direct Link  http://www.nec.com/
Logo NEC - NEC

UPD7566AG Datasheet(HTML) 8 Page - NEC

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µPD7566A, 7566A(A)
8
1.4
NOTES ON USING THE P00/INT0, AND RESET PINS
In addition to the functions described in 1.1, 1.2, and 1.3, an exclusive function for setting the test mode, in which
the internal functions of the
µPD7566A are tested, is provided to the P00/INT0 and RESET pins.
If a voltage less than VSS is applied to either of these pins, the
µPD7566A is put into test mode. Therefore, even
when the
µPD7566A is in normal operation, if noise less than the VSS is input into any of these pins, the µPD7566A
will enter the test mode, and this will cause problems for normal operation.
As an example, if the wiring to the P00/INT0 pin or the RESET pin is long, stray noise may be picked up and the
above mentioned problem may occur.
Therefore, all wiring to these pins must be made short enough to not pick up stray noise. If noise cannot be
avoided, suppress the noise using a capacitor or diode as shown in the figure below.
• Connect a diode having a low VF across
• Connect a capacitor across P00/INT0 and RESET,
P00/INT0 and RESET, and VSS.
and VSS.
VDD
P00/INT0, RESET
VDD
VSS
Low VF
diode
VDD
P00/INT0, RESET
VDD
VSS


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