hi all
i am trying to interface a lcd 16x2 display onto my arm7 board which has lpc2148 and since i am new into arm i have a doubt regarding how do we send and read a data on to a particular port so that it can be dislayed on the display
The PLL is there because it allows a low-frequency crystal to be used, while still allowing you to run the processor at a large number of different speeds, depending on the actual requirements.
You can run without the PLL too - it will just make the program a bit slower, but the LCD does not need the extra speed.