
HYUNDAI MicroElectronics
20
The interval of WDT interrupt is decided by the interrupt interval of Basic Interval Timer and the
contents of WDTR.
The interval of WDT = The contents of WDTR
The interval of B.I.T.
Caution) Do not use the contents of WDTR = "0"
The relationship between the input clock of B.I.T and the output of W.D.T. (@8MHz)
BTS2 BTS1 BTS0 B.I.T. Input Clock The cycle of B.I.T. The cycle of W.D.T.(max)
0
0
0
PS4 ( 2
) 512
32,256
0
0
1
PS5 ( 4
) 1,024
64,512
0
1
0
PS6 ( 8
) 2,048
129,024
0
1
1
PS7 ( 16
) 4,096
258,048
1
0
0
PS8 ( 32
) 8,192
516,096
1
0
1
PS9 ( 64
) 16,384
1,032,192
1
1
0
PS10 ( 128
) 32,768
2,064,384
1
1
1
PS11 ( 256
) 65,536
4,128,768
2.5.2. The output of WDT signal
The overflow of WDT can be output through R54/WDT O port by setting bit4 of PMR5(WDTS) to
"1".
PORT R5 MODE REGISTER
<00D1
H
>
PMR5
7
-
6
-
5
BUZS
4
WDTS
3
-
2
-
1
-
0
-
W
W
R54/WDT O Selection
0 : R54 ( Input / Output )
1 : WDTO ( Output )