I'm reading the back of my Teensy 4.1 card and realized that the PSRAM slot has two of its pins (D0, CLK) marked next to greyed out RX1 and TX1. I assume that these QSPI and UART1 features are on the same pins. So if I intend to add PSRAM or extra FLASH, I should not use Serial1, SPI2, UART8 (RX8 is CS0), or I2C1 (SCL1 is CS1), correct?
Also, RX1 and TX1 are marked as pins 0 and 1 on the front side of the card. I suppose pins 0 and 52 are the same physical pin, and if I use them as GPIOs, I can use either 0 or 52, correct? Thanks.
Also, RX1 and TX1 are marked as pins 0 and 1 on the front side of the card. I suppose pins 0 and 52 are the same physical pin, and if I use them as GPIOs, I can use either 0 or 52, correct? Thanks.