Clkcon — system clock control register, Clkcon – Samsung S3C8275X User Manual

Page 77

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

Oscillator IRQ Wake-up Function Bit

Enable IRQ for main wake-up in power down mode

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

appropriate

values

to CLKCON.3 and CLKCON.4.

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