st link v2 stm8 not reset

after program the mcu by STVP, the mcu does not reset and start up, why?

swim does not have reset function?

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Visitor II

Hi David,

I have the ST-LINK V2/ISOL.

At least these 2 conditions must be met:

1. You also need to connect the ST-LINK-V2 RESET pin to the target MCU RESET pin !

Make sure to have all connections in user manual UM1075, par. 3.1.3 "SWIM signals and connections", table 2.

2. The ST-LINK-V2 RESET pin must be ABLE to pull the MCU-RESET pin low enough.

So if you drive the target MCU-RESET pin by a push-pull driver or your pull-up resistor is very low,

the ST-LINK-V2 RESET pin driver might not reach a sufficent low level to cause a MCU reset.

The ST-LINK-V2 RESET pin is an input and an open drain output with a 680 Ohm pull-up.

Best use a wired-or aproach on your target board.

Hope this helps,

John

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