SM59264IHHK SYNCMOS [SyncMOS Technologies,Inc], SM59264IHHK Datasheet - Page 17

• Manufacturer Part Number: SM59264IHHK
• Description: 8 - Bit Micro-controller with 128KB flash & 1KB RAM embedded
• Manufacturer: SYNCMOS [SyncMOS Technologies,Inc]

Specifications subject to change without notice,contact your sales representatives for the most recent information.
4.1 Watch Dog Timer Registers:
Watch Dog Timer Registers - WDT Control Register (WDTC, $9F)
Watch Dog Key Register - (WDTKEY, $97H)
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
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
CLEAR: Watch Dog Timer reset bit
PS[2:0]: Overflow period select bits
Read :
Write:
Reset value:
WDTE: Watch Dog Timer enable bit
Read:
Write :
Reset value:
SyncMOS Technologies Inc.
May 2002
WDTE
bit-7
KEY7
WDT
bit-7
0
*
PS [2:0]
MOV WDTKEY, # 1EH
MOV WDTKEY, # E1H
MOV WDTKEY, # E1H
MOV WDTKEY, # 1EH
000
001
010
011
100
101
110
111
Unused
KEY6
WDT
*
*
CLEAR
KEY5
WDT
*
0
Overflow Period (ms)
KEY4
Unused
WDT
*
17/32
*
KEY3
131.072
262.144
WDT
Unused
16.384
32.768
65.536
2.048
4.096
8.192
*
*
KEY2
WDT
*
PS2
0
KEY1
WDT
*
PS1
0
Ver 1.0
KEY0
WDT
bit-0
PID 59264 05/02
bit-0
PS0
SM59264
*
0