UCFG1 register

I want to set up the MCB900 to use an external oscillator (12MHz),but I can't assign any values to the UCFG1 register to set up FOSC..How do I access UCFG1 to set the ext. osc, and do I have to configure...
UCFG1 register

I want to set up the MCB900 to use an external oscillator (12MHz),but I can't assign any values to the UCFG1 register to set up FOSC..How do I access UCFG1 to set the ext. osc, and do I have to configure...
regarding ucfg1 config in my file

sir, i am using your keil LPC 51 C-COMPILER as i request you send a one file startlpc.a51. But i facing one error in it Error L121 : IMPROPER FIXUP MODULE : Startlpc.obj Segment : ABSOLUTE ...
regarding ucfg1 config in my file

sir, i am using your keil LPC 51 C-COMPILER as i request you send a one file startlpc.a51. But i facing one error in it Error L121 : IMPROPER FIXUP MODULE : Startlpc.obj Segment : ABSOLUTE ...
external clock selection using UCFG1 for P89LPC9408

I am selecting external clock using UCFG1 SFR register in START900.A51 file for P89LPC9408 is the following code is sufficient to activate my external clock in my hardware?. NAME ?C_STARTUP...