I see that you intend to use the UM232R. This is a module from FTDI that actually uses the FT232R chip that I had recommended in another posting in this thread. This module looks like this:



There is a very detailed PDF manual for using this module at this link:

Detailed 28 page UM232R Module Data Sheet

You should be able to directly connect the TxD and RxD of your MCU to the UM232 module. Make sure to set the jumper J1 on the module in the correct position (5V versus 3.3V) to match the supply voltage you are using for your microcontroller. Do note that the TxD pin of your MCU is probably an output from the controller. That will need to connect to the RxD input of the UM232R module. In like manner the TxD output of the UM232R module will have to connect to the RxD pin of your microcontroller.

Note that when you use the UM232R module all the communications between the MCU and the module on the TxD amd RxD pins are standard TTL level asynchronous serial protocol. You will have to install the FTDI driver for the FT232R chip on the PC end so that the PC can "see the module" as a COM: port. Application software on the PC side that interfaces to this COM: port will setup the baud rate and port format for the serial protocol. You will then have to program your MCU to work at that baud rate and serial port format.

Michael Karas