Posted on May 17, 2011 at 13:23Hi, Since some SPI3/I2S3 pins are shared with JTAG pins (SPI3_NSS/I2S3_WS with JTDI and SPI3_SCK/I2S3_CK with JTDO), they are not controlled by the I/O controller and are reserved for JTAG usage (after each Reset). For...