Samsung 8-Bit CMOS Microcontroller, S3C9228/P9228 user manual Clkcon System Clock Control Register

S3C9228/P9228CONTROL REGISTERS

CLKCON — System Clock Control Register D4H

Bit Identifier

RESET Value

Read/Write

.7

.7	.6	.5	.4	.3	.2	.1	.0
0	0	0	0	0	0	0	0
R/W	R/W	R/W	R/W	R/W	R/W	R/W	R/W

Oscillator IRQ Wake-up Function Bit

0Enable IRQ for main or sub oscillator wake-up in power down mode

1Disable IRQ for main or sub oscillator wake-up in power down mode

.6-.5	Bits 6-5
	0	Always logic zero
.4-.3	CPU Clock (System Clock) Selection Bits
	0	0	Divide by 16 (fxx/16)
	0	1	Divide by 8 (fxx /8)
	1	0	Divide by 2 (fxx /2)
	1	1	Non-divided clock (fxx)
.2-.0	Bits 2-0

0 Always logic zero

4-7