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4571 Datasheet(PDF) 42 Page - Renesas Technology Corp |
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4571 Datasheet(HTML) 42 Page - Renesas Technology Corp |
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42 / 126 page  Rev.1.02 May 25, 2007 Page 42 of 124 REJ03B0179-0102 4571 Group VOLTAGE DROP DETECTION CIRCUIT The built-in voltage drop detection circuit is used to set the voltage drop detection circuit interrupt request flag (VDF) or to perform system reset. The voltage drop detection circuit stops at RAM back-up mode. Fig 44. Voltage drop detection reset circuit WEF VRST-/VRST+ - + VINT - + Interrupt occurrence Reset occurrence VDF Voltage drop detection circuit interrupt S R Q Q Oscillation stop signal Key-on wakeup signal EPOF instruction + POF instruction Power-on reset circuit Watchdog reset signal SRST instruction Internal reset signal (Note 1) RESET pin (Note 2) Pull-up transistor Voltage drop detection circuit (Note 1) Notes 1: This symbol represents a parasitic diode. 2: Applied potential to RESET pin must be VDD or less. |
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