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參數(shù)資料
| 型號： | XC866L-2FR |
| 廠商： | INFINEON TECHNOLOGIES AG |
| 元件分類： | 8位微控制器 |
| 英文描述： | 8-bit Microcontroller with 2/4/8K Bytes In-System Programmable Flash |
| 中文描述： | 8位微控制器與2/4/8K字節(jié)在系統(tǒng)可編程閃存 |
| 文件頁數(shù)： | 62/108頁 |
| 文件大?。?/td> | 979K |
| 代理商： | XC866L-2FR |
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XC866
Functional Description
Data Sheet
58
V1.0, 2006-02
3.10
Watchdog Timer
The Watchdog Timer (WDT) provides a highly reliable and secure way to detect and
recover from software or hardware failures. The WDT is reset at a regular interval that is
predefined by the user. The CPU must service the WDT within this interval to prevent the
WDT from causing an XC866 system reset. Hence, routine service of the WDT confirms
that the system is functioning properly. This ensures that an accidental malfunction of
the XC866 will be aborted in a user-specified time period. In debug mode, the WDT is
suspended and stops counting. Therefore, there is no need to refresh the WDT during
debugging.
Features:
16-bit Watchdog Timer
Programmable reload value for upper 8 bits of timer
Programmable window boundary
Selectable input frequency of f
PCLK
/2 or f
PCLK
/128
Time-out detection with NMI generation and reset prewarning activation (after which
a system reset will be performed)
The WDT is a 16-bit timer incremented by a count rate of f
PCLK
/2 or f
PCLK
/128. This
16-bit timer is realized as two concatenated 8-bit timers. The upper 8 bits of the WDT
can be preset to a user-programmable value via a watchdog service access in order to
modify the watchdog expire time period. The lower 8 bits are reset on each service
access.
Figure 26
shows the block diagram of the WDT unit.
Figure 26
WDT Block Diagram
WDTREL
MUX
WDT Low Byte
1:2
Clear
WDT
Control
1:128
WDT High Byte
WDTTO
WDTIN
f
PCLK
Logic
ENWDT
ENWDT_P
WDTRST
Overflow/Time-out Control &
Window-boundary control
WDTWINB
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| XC866L-2RR | 8-bit Microcontroller with 2/4/8K Bytes In-System Programmable Flash |
| XC866L-4FR | 8-bit Microcontroller with 2/4/8K Bytes In-System Programmable Flash |
| XC866L-4RR | 8-bit Microcontroller with 2/4/8K Bytes In-System Programmable Flash |
| XC886 | 8-bit Microcontroller with 2/4/8K Bytes In-System Programmable Flash |
| XC886C | 8-bit Microcontroller with 2/4/8K Bytes In-System Programmable Flash |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| XC866L2FRA3VBELXUMA1 | 制造商:Infineon Technologies AG 功能描述:8 BIT FLASH 制造商:Infineon Technologies AG 功能描述:8 BIT FLASH - Tape and Reel |
| XC866L2FRA5VBELXUMA1 | 制造商:Infineon Technologies AG 功能描述:8 BIT FLASH 制造商:Infineon Technologies AG 功能描述:8 BIT FLASH - Tape and Reel |
| XC866L-2RR | 制造商:INFINEON 制造商全稱:Infineon Technologies AG 功能描述:8-Bit Single Chip Microcontroller |
| XC866L-4FR | 制造商:INFINEON 制造商全稱:Infineon Technologies AG 功能描述:8-Bit Single Chip Microcontroller |
| XC866L4FRA3VBEKXUMA1 | 制造商:Infineon Technologies AG 功能描述:MCU 8-BIT XC800 8051 CISC 12KB FLASH 2.5V/3.3V 38-PIN TSSOP 制造商:Infineon Technologies AG 功能描述:8 BIT FLASH - Tape and Reel 制造商:Infineon Technologies AG 功能描述:IC MCU 8BIT 16KB FLASH 38TSSOP |
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