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AN3155 Datasheet(PDF) 14 Page - STMicroelectronics

Part # AN3155
Description  USART protocol used in the STM32 bootloader
PDF  37 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN3155 Datasheet(HTML) 14 Page - STMicroelectronics

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Bootloader command set
AN3155
14/37
DocID17066 Rev 6
Figure 8. Read Memory command: host side
1. RM = Read Memory.
Note:
Some products may return two NACKs instead of one single NACK when Read Protection
(RDP) is active (or Read Potection level 1 is active). To know if a given product returns one
•
byte 3: MSB
•
byte 6: LSB
Byte 7:
Checksum: XOR (byte 3, byte 4, byte 5, byte 6)
Wait for ACK
Byte 8:
The number of bytes to be read – 1 (0 < N
≤ 255);
Byte 9:
Checksum: XOR byte 8 (complement of byte 8)



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