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UM0470 Datasheet(PDF) 22 Page - STMicroelectronics

Part # UM0470
Description  STM8 SWIM communication protocol and debug module
PDF  37 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

UM0470 Datasheet(HTML) 22 Page - STMicroelectronics

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Debug module (DM)
UM0470
22/37
4.5
Software breakpoint mode
Software breakpoint mode is reserved for debugging tools to insert breakpoints into user
code by substituting a user instruction with a software break (reserved BKPT instruction
#8b).
Software breakpoint mode is enabled using the SWBKPE bit in the DM control/status
register 2 (DM_CSR2).
When a BKPT instruction is decoded, the CPU is stalled and the STALL and SWBKF bits
are set by hardware to indicate that a software breakpoint has occurred. To resume
execution, the debugger must restore the user's instruction, then set the FLUSH bit and
clear the STALL bit.



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