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PIC18F258-E/LSQTP bảng dữ liệu(PDF) 262 Page - Microchip Technology |
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PIC18F258-E/LSQTP bảng dữ liệu(HTML) 262 Page - Microchip Technology |
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262 / 402 page ![]() PIC18FXX8 DS41159E-page 260 © 2006 Microchip Technology Inc. FIGURE 23-2: LOW-VOLTAGE DETECT (LVD) BLOCK DIAGRAM The LVD module has an additional feature that allows the user to supply the trip voltage to the module from an external source. This mode is enabled when bits LVDL3:LVDL0 are set to ‘1111’. In this state, the com- parator input is multiplexed from the external input pin LVDIN to one input of the comparator (Figure 23-3). The other input is connected to the internally generated voltage reference (parameter #D423 in Section 27.2 “DC Characteristics”). This gives users flexibility, because it allows them to configure the Low-Voltage Detect interrupt to occur at any voltage in the valid operating range. FIGURE 23-3: LOW-VOLTAGE DETECT (LVD) WITH EXTERNAL INPUT BLOCK DIAGRAM LVDIF VDD LVDEN LVDCON Internally Generated Reference Voltage, LVDIN LVDL3:LVDL0 Register 1.2V Typical LVD EN BGAP BODEN LVDEN VxEN LVDIN VDD VDD Externally Generated Trip Point LVDL3:LVDL0 LVDCON Register |
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