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UPD17216GT Datasheet(PDF) 9 Page - NEC |
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UPD17216GT Datasheet(HTML) 9 Page - NEC |
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9 / 84 page  µPD17215, 17216, 17217, 17218 9 1.3 Processing of Unused Pins Process the unused pins as follows: Table 1-1 Processing of Unused Pins Pin Recommended Connection P0A0-P0A3 Connect to VDD P0B0-P0B3 Connect to VDD P0C0-P0C3 Connect to GND P0D0-P0D3 Connect to GND P0E0-P0E3 Input : Connect to VDD or GND Output : Open REM Open INT Connect to GND WDOUT Connect to GND 1.4 Notes on Using INT and RESET Pins In addition to the functions shown in 1.1 PIN FUNCTIONS, the INT and RESET pins also have a function to set a test mode (for IC testing) in which the internal operations of the µPD17215 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 ordinary operation, the µPD17215 may be set in the test mode if a noise exceeding VDD is applied. For example, if the wiring length of the INT or RESET pin is too long, noise superimposed on the wiring line of the pin main 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 and INT/RESET pin V DD V DD V DD V DD INT, RESET INT, RESET Diode with low V F If the test mode is set by the INT pin, low level is output from the WDOUT pin. In this case, connect the WDOUT and RESET pin. • Connect capacitor between VDD and INT/RESET pin |
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