Samsung S3C2440A - Manual (Page 271)

S3C2440A RISC MICROPROCESSOR I/O PORTS
9-25
CLKSEL1 (1) [10:8] Select source clock with CLKOUT1 pad
000 = MPLL output
001 = UPLL output
010 = RTC clock output
011 = HCLK
100 = PCLK
101 = DCLK1
11x = reserved
000
Reserved [7] - 0
CLKSEL0 (1) [6:4] Select source clock with CLKOUT0 pad
000 = MPLL INPUT Clock(XTAL)
001 = UPLL output
010 = FCLK
011 = HCLK
100 = PCLK
101 = DCLK0
11x = reserved 010
SEL_USBPAD [3] USB1 Host/Device select register.
0 = use USB1 as Device
1 = use USB1 as Host 0
Reserved [2] Reserved 0
SPUCR1 [1] 0 = DATA[31:16] port pull-up resister is enabled
1 = DATA[31:16] port pull-up resister is disabled 0
SPUCR0 [0] 0 = DATA[15:0] port pull-up resister is enabled
1 = DATA[15:0] port pull-up resister is disabled 0
Note 1) We recommend not to use this ouput pad to other device’s pll clock source.