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H8SX/1663R 数据表(PDF) 137 Page - Renesas Technology Corp |
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H8SX/1663R 数据表(HTML) 137 Page - Renesas Technology Corp |
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137 / 1504 page  Section 5 Voltage Detection Circuit (LVD) Rev. 2.00 Sep. 24, 2008 Page 105 of 1468 REJ09B0412-0200 Section 5 Voltage Detection Circuit (LVD) The voltage detection circuit (LVD) is only supported by the H8SX/1668M Group. This circuit is used to monitor Vcc. The LVD is capable of internally resetting the LSI when Vcc falls and crosses the voltage detection level. An interrupt can also be generated. 5.1 Features • Voltage-detection circuit Capable of detecting the power-supply voltage (Vcc) becoming less than or equal to Vdet. Capable of generating an internal reset or interrupt when a low voltage is detected. A block diagram of the voltage detection circuit is shown in figure 5.1. Vcc LVDF LVDE LVDRI LVDMON On-chip reference voltage (for sensing Vdet) [Legend] LVDE: LVD enable LVDRI: LVD reset / interrupt select LVDMON: LVD monitor LVDF: LVD flag Power-supply stabilization time generation circuit Reset / interrupt control circuit Voltage-monitoring reset Voltage-monitoring interrupt + − Figure 5.1 Block Diagram of Voltage-Detection Circuit |
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