S3P9228 Datasheet, PDF (279/462 Pages) Samsung semiconductor – 8-BIT CMOS MICROCONTROLLERS USERS MANUAL

S3C9228/P9228
CONTROL REGISTERS
CLKCON — System Clock Control Register
D4H
Bit Identifier
RESET Value
Read/Write
.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
.7
Oscillator IRQ Wake-up Function Bit
0 Enable IRQ for main or sub oscillator wake-up in power down mode
1 Disable 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