SyncMOS Technologies International. Inc.
SM79164
3.1 Watch Dog Timer Registers:
Watch Dog Timer Registers - WDT Control Register (WDTC, $9F)
bit-7
bit-0
PS0
R/W
0
WDTE
R/W
0
Reserve
CLEAR
R/W
0
Unused
Unused
PS2
R/W
0
PS1
R/W
0
Read / Write:
Reset value:
-
-
-
*
*
*
WDTE : Watch Dog Timer enable bit
CLEAR : Watch Dog Timer reset bit
PS[2:0] : Overflow period select bits
PS [2:0]
000
Overflow Period (ms)
2.048
001
4.096
010
8.192
011
16.384
100
32.768
101
65.536
110
131.072
262.144
111
Watch Dog Key Register - (WDTKEY, $97H)
bit-7
bit-0
WDT
KEY0
W
WDT
KEY7
W
WDT
KEY6
W
WDT
KEY5
W
WDT
KEY4
W
WDT
KEY3
W
WDT
KEY2
W
WDT
KEY1
W
Read / Write:
Reset value:
0
0
0
0
0
0
0
0
By default, the WDTC is read only. User need to write values 1EH, E1H sequentially to the WDTKEY($97H) register to
enable the WDTC write attribute, That is
MOV WDTKEY, # 1EH
MOV WDTKEY, # E1H
When WDTC is set, user need to write another values E1H, 1EH sequentially to the WDTKEY($97H) register to disable the
WDTC write attribute, That is
MOV WDTKEY, # E1H
MOV WDTKEY, # 1EH
Specifications subject to change without notice,contact your sales representatives for the most recent information.
12/26
Ver 2.1
SM79164 08/2006
SYNCMOS [ SYNCMOS TECHNOLOGIES,INC ]
