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STR720 bảng dữ liệu(PDF) 372 Page - STMicroelectronics

tên linh kiện STR720
Giải thích chi tiết về linh kiện  ARM720T 16/32-BIT MCU WITH 16K RAM, USB, CAN, 3 TIMERS, ADC, 6 COMMUNICATIONS INTERFACES
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nhà sản xuất  STMICROELECTRONICS [STMicroelectronics]
Trang chủ  http://www.st.com
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STR720 bảng dữ liệu(HTML) 372 Page - STMicroelectronics

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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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