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UM0470 Datasheet(PDF) 6 Page - STMicroelectronics

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

UM0470 Datasheet(HTML) 6 Page - STMicroelectronics

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Single wire interface module (SWIM)
UM0470
6/37
3
Single wire interface module (SWIM)
3.1
Operating modes
After a Power-On Reset (powering of the device) the SWIM module is reset and enters in its
OFF mode.
1.
OFF: In this mode the SWIM pin must not be used as an I/O by the application. It is
waiting for the SWIM entry sequence or to be switched to I/O mode by the application
software.
2.
I/O: This state is entered by the software application by setting the IOM bit in the core
configuration register (MCR). In this state, the user application can use the SWIM pin
as a standard I/O pin, the only drawback is that there is no way to debug the
functionality of this pin with the built-in debug capabilities.
In case of a reset, the SWIM goes back to OFF mode.
3.
ACTIVE: This mode is entered when a specific sequence is detected on the SWIM pin
while in OFF state. In this state, the SWIM pin is used by the host tool to control the
STM8 with 3 commands. (SRST System Reset, ROTF Read On The Fly, WOTF Write
On The Fly)
Note:
Please note that the SWIM can be set Active and communicate while the device is in
RESET state (NRST pin forced low)
Figure 3.
SWIM module activation sequence
POR
ACTIVE
I/O
OFF
IOM bit set
Y
SWIM entry
sequence
Y
ROTF
WOTF
RST bit set
reset
N
N
Y
N
CSR
SRST


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