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Os motores de busca de Datasheet de Componentes eletrônicos |
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Os motores de busca de Datasheet de Componentes eletrônicos |
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MCP79411 Folha de dados(PDF) 16 Page - Microchip Technology |
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MCP79411 Folha de dados(HTML) 16 Page - Microchip Technology |
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16 / 38 page  MCP7941X DS22266B-page 16 Preliminary 2011 Microchip Technology Inc. 4.2.7 POWER-FAIL TIME-STAMP The MCP7941X family of RTCC devices feature a power-fail time-stamp feature. This feature will save the time at which VCC crosses the VTRIP voltage. To use this feature, a VBAT supply must be present and the oscillator must also be running. There are two separate sets of registers that are used to record this information: • The first set located at 0x18h through 0x1Bh are loaded at the time when VCC fails and the RTCC operates on the VBAT. The VBAT (register 0x03h bit 4) bit is also set at this time. • The second set of registers, located at 0x1Ch through 0x1Fh, are loaded at the time when VCC is restored and the RTCC switches to VCC. The power-fail time-stamp registers are cleared when the VBAT bit is cleared in software. |
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