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參數(shù)資料
| 型號： | XC866L-4FR |
| 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)： | 63/108頁 |
| 文件大?。?/td> | 979K |
| 代理商： | XC866L-4FR |
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XC866
Functional Description
Data Sheet
59
V1.0, 2006-02
If the WDT is not serviced before the timer overflow, a system malfunction is assumed.
As a result, the WDT NMI is triggered (assert WDTTO) and the reset prewarning is
entered. The prewarning period lasts for 30
H
count, after which the system is reset
(assert WDTRST).
The WDT has a “programmable window boundary” which disallows any refresh during
the WDT’s count-up. A refresh during this window boundary constitutes an invalid
access to the WDT, causing the reset prewarning to be entered but without triggering the
WDT NMI. The system will still be reset after the prewarning period is over. The window
boundary is from 0000
H
to the value obtained from the concatenation of WDTWINB and
00
H
.
After being serviced, the WDT continues counting up from the value (<WDTREL> * 2
8
).
The time period for an overflow of the WDT is programmable in two ways:
the input frequency to the WDT can be selected to be either f
PCLK
/2 or f
PCLK
/128
the reload value WDTREL for the high byte of WDT can be programmed in register
WDTREL
The period, P
WDT
, between servicing the WDT and the next overflow can be determined
by the following formula:
If the Window-Boundary Refresh feature of the WDT is enabled, the period P
WDT
between servicing the WDT and the next overflow is shortened if WDTWINB is greater
than WDTREL, see
Figure 27
. This period can be calculated using the same formula by
replacing WDTREL with WDTWINB. For this feature to be useful, WDTWINB should not
be smaller than WDTREL.
Figure 27
WDT Timing Diagram
P
WDT
1
2
WDTIN
+
6
×
(
)
2
16
f
PCLK
WDTREL
–
2
8
×
(
)
×
=
WDTREL
WDTWINB
time
Count
FFFF
H
No refresh
allowed
Refresh allowed
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 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 |
| XC866L4FRA3VBELXUMA1 | 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 |
| XC866L4FRA5VBELXUMA1 | 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 |
| XC866L4FRABEKXUMA1 | 制造商:Infineon Technologies AG 功能描述:MCU 8-BIT XC800 8051 CISC 12KB FLASH 2.5V/5V 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 FLASH 38-TSSOP |
| XC866L4FRIBEKXUMA1 | 制造商:Infineon Technologies AG 功能描述:MCU 8-BIT XC800 8051 CISC 12KB FLASH 2.5V/5V 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 FLASH 38-TSSOP |
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