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7630 Datasheet(PDF) 32 Page - Renesas Technology Corp |
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7630 Datasheet(HTML) 32 Page - Renesas Technology Corp |
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32 / 238 page  1-16 7630 Group User’s Manual +$5':$5( Port Overvoltage Application When configured as input ports, P1 to P4 may be subjected to over- voltage (VI >VCC) if the input current to the applicable port is limited to the specified values (see “Table 10:”). Use a serial resistor of appropriate size to limit the input current. To estimate the resistor value, assume the port voltage to be VCC at overvoltage condition. Notes: • Subjecting ports to overvoltage may effect the supply voltage. Assure to keep VCC and VSS within the target limits. • Avoid to subject ports to overvoltage causing VCC to rise above 5.5 V. • The overvoltage condition causing input current flowing through the internal port protection circuits has a negative effect on the ports noise immunity. Therefore, careful and intense testing of the target system’s noise immunity is required. Refer to the “counter- measures against noise” of the corresponding users manual. • Port P0 must not be subjected to overvoltage conditions. I/O PORTS |
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