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UPD17P236M3 数据表(PDF) 12 Page - NEC

部件名 UPD17P236M3
功能描述  4-BIT SINGLE-CHIP MICROCONTROLLER FOR SMALL GENERAL-PURPOSE INFRARED REMOTE CONTROLLER
PDF  32 Pages
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制造商  NEC [NEC]
网页  http://www.nec.com/
标志 NEC - NEC

UPD17P236M3 数据表(HTML) 12 Page - NEC

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µPD17P236
12
Data Sheet U14776EJ1V0DS00
2.4 Processing of Unused Pins
Process the unused pins as follows:
Table 2-1. Processing of Unused Pins
Pin
Recommended Connection
P0A0-P0A3
Leave open.
P0B0-P0B3
P0C0-P0C3
P0D0-P0D3
P0E0-P0E3
Input
: Individually connect to VDD or GND via resistor.
Output : Leave open.
P1A0
Connect to GND.
REM
Leave open.
INT
Connect to GND.
IC1, IC2
These pins cannot be used.
Leave open.
2.5 Notes on Using the RESET and INT Pins
In addition to the functions shown in 2. PIN FUNCTIONS, the RESET pin also has the function of setting a test mode
(for IC testing) in which the internal operations of the
µPD17P236 are tested.
When a voltage higher than VDD is applied to either of these pins, the test mode is set. This means that, even during
normal operation, the
µPD17P236 may be set in the test mode if noise exceeding VDD is applied.
For example, if the wiring length of the RESET or INT pin is too long, noise superimposed on the wiring line of the pin
may cause the above problem.
Therefore, keep the wiring length of these pins as short as possible to suppress the noise; otherwise, take noise
preventive measures as shown below by using external components.
• Connect diode with low VF between VDD
• Connect capacitor between VDD
and RESET/INT pin
and RESET/INT pin
VDD
VDD
RESET, INT
VDD
VDD
RESET, INT
Diode with
low VF



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