HMS87C5216 Datasheet, PDF (58/76 Pages) List of Unclassifed Manufacturers – CMOS SINGLE-CHIP 8-BIT MICROCONTROLLER FOR UR(Universal Remocon) & WIRELESS KEYBOARD

HMS87C5216
14. 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
WDT5
CLR
WDTON
To Reset circuit
6BIT COMPARATOR
IF WDT
WDTR WDTR0 WDTR1 WDTR2 WDTR3 WDTR4 WDTR5 WDTCL
0
6
W <00C8 h>
Internal Data Bus
Figure 14-1 Block diagram of Watch Dog Timer
14.1 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 <00C7 h>
WDTON
0
1
Watch Dog Timer Function Control
6-bit Timer
Watch Dog Timer
By assigning bit6(WDTCL) of WDTR, 6-bit counter can be
cleared.
SEP. 2004 Ver 1.01