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參數(shù)資料
| 型號： | W78E52B |
| 廠商： | WINBOND ELECTRONICS CORP |
| 英文描述： | 8-BIT MTP Monitor Microcontroller(多次可編程的8位的監(jiān)視微控制器) |
| 中文描述： | 8位微控制器監(jiān)視器中期計劃（多次可編程的8位的監(jiān)視微控制器） |
| 文件頁數(shù)： | 7/22頁 |
| 文件大?。?/td> | 306K |
| 代理商： | W78E52B |
Preliminary W78E52B
Publication Release Date: December 1998
- 7 -
Revision A1
The power-off flag is located at PCON.4. This bit is set when V
DD
has been applied to the part. It can
be used to determine if a reset is a warm boot or a cold boot if it is subsequently reset by software.
Watchdog Timer
The Watchdog timer is a free-running timer which can be programmed by the user to serve as a
system monitor, a time-base generator or an event timer. It is basically a set of dividers that divide
the system clock. The divider output is selectable and determines the time-out interval. When the
time-out occurs a system reset can also be caused if it is enabled. The main use of the Watchdog
timer is as a system monitor. This is important in real-time control applications. In case of power
glitches or electro-magnetic interference, the processor may begin to execute errant code. If this is
left unchecked the entire system may crash. The watchdog time-out selection will result in different
time-out values depending on the clock speed. The Watchdog timer will de disabled on reset. In
general, software should restart the Watchdog timer to put it into a known state. The control bits that
support the Watchdog timer are discussed below.
Watchdog Timer Control Register
Bit:
7
6
5
4
-
3
-
2
1
0
ENW
CLRW
WIDL
PS2
PS1
PS0
Mnemonic: WDTC
Address: 8FH
ENW : Enable watch-dog if set.
CLRW : Clear watch-dog timer and prescaler if set. This flag will be cleared automatically
WIDL : If this bit is set, watch-dog is enabled under IDLE mode. If cleared, watch-dog is disabled
under IDLE mode. Default is cleared.
PS2, PS1, PS0 : Watch-dog prescaler timer select. Prescaler is selected when set PS2~0 as follows:
PS2 PS1 PS0
PRESCALER SELECT
0 0 0
2
0 1 0
4
0 0 1
8
0 1 1
16
1 0 0
32
1 0 1
64
1 1 0
128
1 1 1
256
The time-out period is obtained using the following equation:
1
OSC
2
PRESCALER 1000 12 mS
14
×
×
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| W78E52BF-24 | 8-BIT MTP MICROCONTROLLER |
| W78E52B-24 | 8-BIT MTP MICROCONTROLLER |
| W78E52B-40 | 8-BIT MTP MICROCONTROLLER |
| W78L33 | |
| W78M32V100BC | 8Mx32 Flash 3.3V Page Mode Simultaneous Read/Write Operation Multi-Chip Package |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| W78E52B-24 | 制造商:WINBOND 制造商全稱:Winbond 功能描述:8-BIT MTP MICROCONTROLLER |
| W78E52B-40 | 制造商:WINBOND 制造商全稱:Winbond 功能描述:8-BIT MTP MICROCONTROLLER |
| W78E52BF-24 | 制造商:WINBOND 制造商全稱:Winbond 功能描述:8-BIT MTP MICROCONTROLLER |
| W78E52BF-40 | 制造商:WINBOND 制造商全稱:Winbond 功能描述:8-BIT MTP MICROCONTROLLER |
| W78E52BP-24 | 制造商:WINBOND 制造商全稱:Winbond 功能描述:8-BIT MTP MICROCONTROLLER |
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