Clkcon System Clock Control Register - Samsung S3C8275X User Manual

S3C8275X/F8275X/C8278X/F8278X/C8274X/F8274X
CLKCON
— System Clock Control Register
Bit Identifier
Reset Value
Read/Write
Addressing Mode
.7
.6–.5
.4–.3
.2–.0
NOTE: After a reset, the slowest clock (divided by 16) is selected as the system clock. To select faster clock speeds, load
the appropriate values to CLKCON.3 and CLKCON.4.
.7 .6
0 –
R/W –
Register addressing mode only
Oscillator IRQ Wake-up Function Bit
0 Enable IRQ for main wake-up in power down mode
1 Disable IRQ for main wake-up in power down mode
Not used for the S3C8275X/C8278X/C8274X (must keep always "0")
CPU Clock (System Clock) Selection Bits
0 0 fxx/16
0 1 fxx/8
1 0 fxx/2
1 1 fxx
Not used for the S3C8275X/C8278X/C8274X (must keep always "0")
.5 .4 .3
– 0 0
– R/W R/W
(note)
CONTROL REGISTER
D4H
.2 .1
– –
– –
Set 1
.0
–
–
4-7