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4501 Datasheet(PDF) 157 Page - Renesas Technology Corp |
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4501 Datasheet(HTML) 157 Page - Renesas Technology Corp |
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157 / 212 page  2-40 Rev.2.01 Feb 07, 2005 4501 Group APPLICATION REJ09B0192-0201 2.5.3 Notes on use (1) Register initial value The initial value of the following registers are undefined after system is released from reset. After system is released from reset, set initial values. • Register Z (2 bits) • Register D (3 bits) • Register E (8 bits) (2) Power-on reset Reset can be automatically performed at power on (power-on reset) by the built-in power-on reset circuit. When the built-in power-on reset circuit is used, the time for the supply voltage to rise from 0 V to 2.0 V must be set to 100 µs or less. If the rising time exceeds 100 µs, connect a capacitor between the RESET pin and VSS at the shortest distance, and input “L” level to RESET pin until the value of supply voltage reaches the minimum operating voltage. 2.5 Reset |
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