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UM0470 Datasheet(PDF) 6 Page - STMicroelectronics |
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UM0470 Datasheet(HTML) 6 Page - STMicroelectronics |
6 / 37 page 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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