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STM8S データシート(PDF) 58 Page - STMicroelectronics

部品番号 STM8S
部品情報  STM8S Series and STM8AF Series 8-bit microcontrollers
PDF  467 Pages
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メーカー  STMICROELECTRONICS [STMicroelectronics]
ホームページ  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

STM8S データシート(HTML) 58 Page - STMicroelectronics

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Single wire interface module (SWIM) and debug module (DM)
RM0016
58/467
DocID14587 Rev 14
There are two important considerations to highlight for the devices where the NRST pin is
not present:
•
If the SWIM pin should be used with the I/O pin functionality, it is recommended to add
a ~5 seconds delay in the firmware before changing the functionality on the pin with
SWIM functions. This action allows the user to set the device into SWIM mode after the
device power on and to be able to reprogram the device. If the pin with SWIM
functionality is set to I/O mode immediately after the device reset, the device is unable
to connect through the SWIM interface and it will be locked forever (if the NRST pin is
not available on the package). This initial delay can be removed in the final (locked)
code.
•
Their program memory must contain a valid program loop. If the device's memory is
empty, the program continues into non-existing memory space and executes invalid
opcode; this causes the device to reset (reading of non-existing memory is random
content). This behavior might lead to periodic device resets and to a difficulty to
connect to the device through the SWIM interface.



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