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STR720 数据表(PDF) 372 Page - STMicroelectronics |
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STR720 数据表(HTML) 372 Page - STMicroelectronics |
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372 / 401 page  STR720 - SYSTEM RESET 372/401 exit from stand-by mode) a check on RTC Alarm registers can be done (see RTCA registers in Chapter 14: REAL TIME CLOCK (RTC) on page 150). These registers are reset to all-1 state, representing a time in the far future which is likely to be useless for any application using the alarm feature. Hence application software can use these registers as a flag to detect RTC reset events, thus distinguishing between a plain system reset (RTCA registers keep their value) and a power-on reset (RTCA registers are initialized). Similarly during power-off sequence or Stand-by entry, RSTIN pin should be driven low before switching off power supply, as depicted in next Figure 70 on page 372. Figure 70. Power-off supply sequence VDD3 VDD RSTIN Reset pin driven low |
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