I like to communicate with the BSL of the MSP430FR5043. In the document slau550ab.pdf, page 34, table 7-11 it says the BSL is on eUSCI_A3. I find two sets of UCA3TX/RX pin sets; one on PIN2_0 and PIN2_1 and on PIN 4_1 and PIN4_2. Which one is the correct one?