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AN3985 bảng dữ liệu(PDF) 92 Page - STMicroelectronics

tên linh kiện AN3985
Giải thích chi tiết về linh kiện  Using the CR95HF library with STM8L microcontrollers
PDF  105 Pages
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nhà sản xuất  STMICROELECTRONICS [STMicroelectronics]
Trang chủ  http://www.st.com
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AN3985 bảng dữ liệu(HTML) 92 Page - STMicroelectronics

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Application example
AN3985
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Doc ID 022255 Rev 2
Figure 8.
Wait for interrupt mode flowchart
Mode#2: Halt Mode
The Halt State is the low power consumption state of the STM8L. The main clock and all
peripherals are switched off. Only an interrupt on I/O pin or reset can wake up the STM8L. In
this state, only tag detection or a pressure on the reset button can wake up the system.
Figure 9.
Halt mode schematic
MS19964V1
Start of Wait for interrupt mode
End of Wait for interrupt mode
Wake Up STM8L
STM8L timeout
= 5s ?
No
Yes
CR95HF Detect
a tag ?
No
Yes
Test communication
Ok ?
Yes
Wake Up CR95HF
Wake Up CR95HF
Wake Up STM8L
Put to sleep CR95HF
MS19965V1
CR95HF
1) Contactless tag
into operating
volume
2) A tag is detected, CR95HF
sent a pulse to wake up STM8L
STM8L



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