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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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MCP7940N-E/ST датащи(PDF) 17 Page - Microchip Technology |
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MCP7940N-E/ST датащи(HTML) 17 Page - Microchip Technology |
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17 / 42 page  2011-2013 Microchip Technology Inc. DS25010E-page 17 MCP7940N 5.2.5 POWER-FAIL TIME-STAMP The MCP7941X family of RTCC devices feature a power-fail time-stamp feature. This feature will store the time at which VCC crosses the VTRIP voltage and is shown in Figure 5-4. 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, is loaded at the time when VCC falls below VTRIP 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, is 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. FIGURE 5-4: POWER-FAIL GRAPH VCC VTRIP(max) VTRIP(min) Power-Down Power-Up Time-Stamp Time-Stamp |
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