Hi Jeff, Thanks for your query. [quote userid="558363" url="~/support/microcontrollers/arm-based-microcontrollers-group/arm-based-microcontrollers/f/arm-based-microcontrollers-forum/1426704/am2431-trying-to-output-mcu_hfosc0_clk-on-mcu_spi0_cs1"]How do I set this up in sysconfig?[/quote] To configure the C6 pin as Chip select pin. Please add the MCPSI peripheral in example.syscfg file as shown below. Please refer below image. [quote userid="558363" url="~/support/microcontrollers/arm-based-microcontrollers-group/arm-based-microcontrollers/f/arm-based-microcontrollers-forum/1426704/am2431-trying-to-output-mcu_hfosc0_clk-on-mcu_spi0_cs1"]I need to set CTRLMMR_MCU_OBSCLK_CTRL bit 24 and I don't see any APIs to modify the MCU registers.[/quote] You can use the HW_RD_REG32() API to write the register. Hope the above information helps. Regards, Tushar
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