i am using an ARM7 lpc2148 board with 12mhz crystal..and i have not used any PLL registers,so then is my PCLK =3mhz...since pclk=1/4th of cclk ??
That's a question for NXP - nothing to do with ARM !
https://community.nxp.com/
https://community.arm.com/developer/tools-software/tools/f/keil-forum/43773/adc-using-stm32/159190#159190
ok..thank you