I'm using LPC4357 256 pin ARM for my embedded system and use an external SDRAM (IS42S16160G).
The SDRAM's clk is connected to CLK1(EMC_CLK1) that is the pin T10. I don't use another CLK Pin such as CLK0, CLK2 and CKL3. The four of clock pins (CLK0 ~ 3) will be enable and set to default value to function 0 as a EMC_CLK output. Actually ,I want to disable the CLK0, 2 and 3 because need to solve EMI/EMC issue. I set the pin function mode to function 2 in CLK0 and CLK2, it could work. Clk0 and Clk2 pin don't have any clock signal now. Unfortunately, when i set the Clk3 to mode 2, the MCU will shutdown even could not enter to main function. I have to pull high the pin ISP Mode Pin, if wanna to program it again. Really confuse about this problem, hope everyone could give me some advice.