Lpc2000

I am using an LPC2148 with a 32.768KHz crystal on the RTC oscillator 
pins. I need to internally route the resulting 32.768KHz clock and 
output it to a GPIO pin. Is this possible? If so how and what pin is 
best to use as the output GPIO pin? The datasheet I have been looking 
at does not seem to have (as far as I can see) a detailed block 
diagram which shows the clock schemes for this device and how I could 
achieve this. If anyone has done this or knows how to do this I would 
appreciate the help. Thanks. Alan