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PIC18F010 Datasheet(PDF) 80 Page - Microchip Technology |
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PIC18F010 Datasheet(HTML) 80 Page - Microchip Technology |
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80 / 176 page  PIC18F010/020 DS41142A-page 78 Preliminary 2001 Microchip Technology Inc. Figure 11-2 shows the block diagram for the LVD mod- ule. A comparator uses an internally generated refer- ence voltage as the set point. When the selected tap output of the device voltage crosses the set point (is lower than), the LVDIF bit is set. Each node in the resister divider represents a “trip point” voltage. The “trip point” voltage is the minimum supply voltage level at which the device can operate before the LVD module asserts an interrupt. When the supply voltage is equal to the trip point, the voltage tapped off of the resistor array is equal to the voltage generated by the internal voltage reference module. The comparator then generates an interrupt signal, set- ting the LVDIF bit. This voltage is software program- mable to any one of 16 values (see Figure 11-2). The trip point is selected by programming the LVDL3:LVDL0 bits (LVDCON<3:0>). FIGURE 11-2: LOW VOLTAGE DETECT (LVD) BLOCK DIAGRAM LVDIF VDD LVDEN LVD Control Register Internally Generated Reference Voltage LVDIN |
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