Samsung S3C8275X - Manual (Page 117)

S3C8275X/F8275X/C8278X/F8278X/C8274X/F8274X CONTROL REGISTER
4-47
WTCON
— Watch Timer Control Register E1H Set 1, Bank 1
Bit Identifier .7 .6 .5 .4 .3 .2 .1 .0
Reset Value 0 0 0 0 0 0 0 0
Read/Write R/W R/W R/W R/W R/W R/W R/W R/W
Addressing Mode Register addressing mode only
.7 Watch Timer Clock Selection Bit
0 Main system clock divided by 2 7 (fx/128)
1 Sub system clock (fxt)
.6
Watch Timer Interrupt Enable Bit
0 Disable watch timer interrupt
1 Enable watch timer interrupt
.5–.4
Buzzer Signal Selection Bits
0 0 0.5 kHz
0 1 1 kHz
1 0 2 kHz
1 1 4 kHz
.3–.2
Watch Timer Speed Selection Bits
0 0 Set watch timer interrupt to 1s
0 1 Set watch timer interrupt to 0.5s
1 0 Set watch timer interrupt to 0.25s
1 1 Set watch timer interrupt to 3.91ms
.1
Watch Timer Enable Bit
0 Disable watch timer; Clear frequency dividing circuits
1 Enable watch timer
.0
Watch Timer Interrupt Pending Bit
0 Interrupt is not pending, clear pending bit when write
1 Interrupt is pending
NOTE: Watch timer clock frequency (fw) is assumed to be 32.768 kHz.