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PIC12F635ESL 数据表(PDF) 89 Page - Microchip Technology |
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PIC12F635ESL 数据表(HTML) 89 Page - Microchip Technology |
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89 / 234 page  © 2007 Microchip Technology Inc. DS41232D-page 87 PIC12F635/PIC16F636/639 8.0 PROGRAMMABLE LOW-VOLTAGE DETECT (PLVD) MODULE The Programmable Low-Voltage Detect (PLVD) module is a power supply detector which monitors the internal power supply. This module is typically used in key fobs and other devices, where certain actions need to be taken as a result of a falling battery voltage. The PLVD module includes the following capabilities: • Eight programmable trip points • Interrupt on falling VDD • Stable reference indication • Operation during Sleep A Block diagram of the PLVD module is shown in Figure 8-1. FIGURE 8-1: PLVD BLOCK DIAGRAM FIGURE 8-2: PLVD OPERATION LVDL<2:0> 8-to-1 8 Stages LVDEN VDD 7 6 2 1 0 Analog MUX + - LVDIF Voltage Generator det Reference PLVD Trip Point LVDIF VDD Set by Hardware Cleared by Software |
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