GMS81004 Datasheet, PDF (45/101 Pages) Hynix Semiconductor – 8-BIT SINGLE CHIP MICROCOMPUTERS

Chapter 4. Peripheral Hardware
4.1.5 Watch Dog Timer
Watch Dog Timer(WDT) consists of 6-bit binary counter, 6-bit comparator, and Watch
Dog Timer Register (WDTR).
IFBIT
0
WDT0
WDT1
WDT2
WDT3
WDT4
5
CLR
WDT5
WDTON
To Reset circuit
WDTR
6BIT COMPARATOR
IF WDT
0
6
WDTR0 WDTR1 WDTR2 WDTR3 WDTR4 WDTR5 WDTCL W <00C8H>
Internal Data Bus
Fig. 4.5 Block diagram of Watch Dog Timer
4.1.5.1 Control of WDT
Watch Dog Timer can be used 6-bit general Timer or specific Watch dog timer by setting
bit5(WDTON) of Clock Control Register(CKCTLR).
7
CKCTLR
-
Clock Control Register
0
-
WDTON ENPCK BTCL
BTS2
BTS1
BTS0
W <00C7H>
WDTON
0
1
Watch Dog Timer Function Control
6-bit Timer
Watch Dog Timer
4 -7