參數(shù)資料
型號： W77IE58
廠商： WINBOND ELECTRONICS CORP
元件分類： 微控制器/微處理器
英文描述： 8-BIT MICROCONTROLLER
中文描述： 8-BIT, FLASH, 25 MHz, MICROCONTROLLER, PDIP40
封裝： DIP-40
文件頁數(shù)： 53/90頁
文件大小： 409K
代理商： W77IE58
Preliminary W77IE58
Publication Release Date: July 2000
- 53 -
Revision A1
Watchdog Timer Reset
The Watchdog timer is a free running timer with programmable time-out intervals. The user can clear the
watchdog timer at any time, causing it to restart the count. When the time-out interval is reached an
interrupt flag is set. If the Watchdog reset is enabled and the watchdog timer is not cleared, then 512
clocks from the flag being set, the watchdog timer will generate a reset . This places the device into the
reset condition. The reset condition is maintained by hardware for two machine cycles. Once the reset is
removed the device will begin execution from 0000h.
Reset State
Most of the SFRs and registers on the device will go to the same condition in the reset state. The
Program Counter is forced to 0000h and is held there as long as the reset condition is applied. However,
the reset state does not affect the on-chip RAM. The data in the RAM will be preserved during the reset.
However, the stack pointer is reset to 07h, and therefore the stack contents will be lost. The RAM
contents will be lost if the V
DD
falls below approximately 2V, as this is the minimum voltage level required
for the RAM to operate normally. Therefore after a first time power on reset the RAM contents will be
indeterminate. During a power fail condition, if the power falls below 2V, the RAM contents are lost.
After a reset most SFRs are cleared. Interrupts and Timers are disabled. The Watchdog timer is disabled
if the reset source was a POR. The port SFRs have FFh written into them which puts the port pins in a
high state. Port 0 floats as it does not have on-chip pull-ups.
Table 6. SFR Reset Value
SFR Name
Reset Value
SFR Name
Reset Value
P0
11111111b
IE
00000000b
SP
00000111b
SADDR
00000000b
DPL
00000000b
P3
11111111b
DPH
00000000b
IP
x0000000b
DPL1
00000000b
SADEN
00000000b
DPH1
00000000b
T2CON
00000000b
DPS
00000000b
T2MOD
00000x00b
PCON
00xx0000b
RCAP2L
00000000b
TCON
00000000b
RCAP2H
00000000b
TMOD
00000000b
TL2
00000000b
TL0
00000000b
TH2
00000000b
TL1
00000000b
TA
11111111b
TH0
00000000b
PSW
00000000b
TH1
00000000b
WDCON
0x0x0xx0b
CKCON
00000001b
ACC
00000000b
P1
11111111b
EIE
xxx
00000b
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
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