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Keil uVision simulator. Serial port VTREGs, AGSI

Hello
I need simulate project for MCU which don't provided by IDE in uVision simulator. But my MCU has Cortex M3 architecture. So I am using Cortex-M3 device in Target device menu. Unfortunately, it doesn't provide any VTREGs for UART simulation. (SxIN, SxOUT). Because of their absence I can't send strings to SIN for control my device. And writing in SFRs of UART I don't get anything in Serial Windows (UARTx). I think about writing DLL-file (using AGSI) which will provide VTREGs (SOUT and SIN) and SFR for UART. But I want to understand if is there any connection between SOUT and Serial Window (UARTx). And if I write data to SOUT, this data will appear in Serial Window. Or I am wrong and the window and VTREGs are independent things???

Thanks in advance.

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