Part Number: AM263P4 Tool/software: Hello, This is DongHoon. I designed a custom board using the AM263P4 and set the SOP to UART boot mode to check if the ROM code operates correctly. However, I am not seeing the 'C' character output via XMODEM on the UART0 channel. I can't see any signals on the UART0_TXD(A6). I suspect the clock source may be the issue. I did not design the board with a quartz crystal for XTAL_IN(T1) and XTAL_OUT(R1), leaving them floating, and instead applied a 25MHz clock oscillator to EXT_REFCLK0(P2). Based on my understanding of "5.6 PLL Configuration" and "6.4.1.2.1 PLL Module" in the SPRUJ55B, there should be no issue supplying the clock through EXT_REFCLK0 instead of XTAL. However, in the note of "5.6 PLL Configuration," it states that an XTAL clock source is required. Could this be causing the issue?
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