Thanks for your reply. I want a trigger pin using which I can trigger the hsadc externally in lpc link 2 board. From the datasheet I have found that I can trigger the hsadc using SGPIO10. I have configured the sgpio10 to the P1_3 pin of LPC4370 controller. Then I have connected the SGPIO10 as a trigger to HSADC using GIMA. Please suggest me a way to trigger HSADC externally.