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UPD17P136ACT Datasheet(PDF) 34 Page - NEC

Part # UPD17P136ACT
Description  4-BIT SINGLE-CHIP MICROCONTROLLER
PDF  292 Pages
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Manufacturer  NEC [NEC]
Direct Link  http://www.nec.com/
Logo NEC - NEC

UPD17P136ACT Datasheet(HTML) 34 Page - NEC

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CHAPTER 2 PIN FUNCTIONS
15
2.4 NOTES ON USING RESET PIN AND P1B0 PIN
The RESET and P1B0 pins have a function for setting a test mode in which the internal operations of the
µPD17134A
subseries are tested (for IC test), in addition to the functions described in 2.1 PIN FUNCTIONS.
When a voltage exceeding VDD is applied to either of these pins, the test mode is set. This means that, even during
the normal operation, the test mode is set if a noise exceeding VDD is applied. As a result, the operation may not be
performed normally.
This is especially true if the wiring length of the RESET or P1B0 pin is too long in which case a noise may be
superimposed on the wiring.
Therefore, perform wiring so that noise may not be superimposed, by keeping the wiring length as short as possible.
If noise is inevitable, take noise preventive measures by using an external component as illustrated below.
• Connect a diode with low VF between
VDD and RESET/P1B0
• Connect a capacitor between
VDD and RESET/P1B0
RESET, P1B0
VDD
VDD
Diode with
low VF
RESET, P1B0
VDD
VDD



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