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