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UM0470 Datasheet(PDF) 13 Page - STMicroelectronics

No. de pieza UM0470
Descripción Electrónicos  STM8 SWIM communication protocol and debug module
PDF  37 Pages
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Fabricante Electrónico  STMICROELECTRONICS [STMicroelectronics]
Página de inicio  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

UM0470 Datasheet(HTML) 13 Page - STMicroelectronics

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UM0470
Single wire interface module (SWIM)
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3.8
SWIM communication in Halt mode
To maintain the communication link with the debug host, the HSI oscillator remains on when
the MCU enters Halt mode. This means that halt mode power consumption measurements
have no meaning when the SWIM module is active.
The NO_ACCESS bit in the SWIM_CSR register is set when the system is in HALT, WFI or
readout protection mode. This means the bus is not accessible in this case.
The OSCOFF bit in the SWIM_CSR register is used to switch off the oscillator. In this case,
debug control is lost as long as the device is in Halt mode and the SWIM pin is high. The
only way to recover the debug control is to induce a falling edge on SWIM pin: this will re-
enable the HSI oscillator.



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