Samsung C8278X ユーザーズマニュアル
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.