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MC908QC8MDXER Datasheet(PDF) 93 Page - Freescale Semiconductor, Inc |
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MC908QC8MDXER Datasheet(HTML) 93 Page - Freescale Semiconductor, Inc |
93 / 274 page MC68HC908QC16 • MC68HC908QC8 • MC68HC908QC4 Data Sheet, Rev. 2 Freescale Semiconductor 93 Chapter 9 Low-Voltage Inhibit (LVI) 9.1 Introduction The low-voltage inhibit (LVI) module is provided as a system protection mechanism to prevent the MCU from operating below a certain operating supply voltage level. The module has several configuration options to allow functionality to be tailored to different system level demands. The configuration registers (see Chapter 4 Configuration Registers (CONFIG1 and CONFIG2)) contain control bits for this module. 9.2 Features Features of the LVI module include: • Programmable LVI reset • Selectable LVI trip voltage • Programmable stop mode operation 9.3 Functional Description Figure 9-1 shows the structure of the LVI module. LVISTOP, LVIPWRD, LVITRIP, and LVIRSTD are user selectable options found in the configuration register. Figure 9-1. LVI Module Block Diagram LOW VDD DETECTOR LVIPWRD STOP INSTRUCTION LVISTOP LVI RESET LVIOUT 0 IF VDD > VTRIPR 1 IF VDD ≤ VTRIPF FROM CONFIGURATION REGISTER VDD LVIRSTD LVITRIP FROM CONFIGURATION REGISTER FROM CONFIGURATION REGISTER FROM CONFIGURATION REGISTER |
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