SyncMOS Technologies International, Inc.
SM59264
8-Bits Micro-controller
with 128KB flash & 1KB RAM & TWSI & SPWM embedded
4.1 Watch Dog Timer Registers:
Watch Dog Timer Registers - WDT Control Register (WDTC, $9F)
bit-7
bit-0
WDTE
R/W
0
Reserve
Clear
R/W
0
Unused
Unused
PS2
R/W
0
PS1
R/W
0
PS0
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]
Overflow Period (ms)
2.048
000
001
010
011
100
101
110
111
4.096
8.192
16.384
32.768
65.536
131.072
262.144
Watch Dog Key Register - (WDTKEY, $97H)
bit-7
bit-0
WDT
WDT
WDT
WDT
WDT
WDT
WDT
WDT
KEY7
KEY6
KEY5
KEY4
KEY3
KEY2
KEY1
KEY0
Read / Write:
Reset value:
W
0
W
0
W
0
W
0
W
0
W
0
W
0
W
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, # 0E1H
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, # 0E1H
MOV WDTKEY, # 1EH
Specifications subject to change without notice contact your sales representatives for the most recent information.
Ver 2.1 SM59264 08/2006
17
SYNCMOS [ SYNCMOS TECHNOLOGIES,INC ]
