參數(shù)資料
型號： SAX-XC878-16FFA3V3
廠商： INFINEON TECHNOLOGIES AG
元件分類： 微控制器/微處理器
英文描述： RISC MICROCONTROLLER, PQFP64
封裝： PLASTIC, TQFP-64
文件頁數(shù)： 127/139頁
文件大小： 4777K
代理商： SAX-XC878-16FFA3V3
XC878CLM
Functional Description
Advance Information
Data Sheet
81
V0.1, 2008-04
If the WDT is not serviced before the timer overflow, a system malfunction is assumed.
As a result, the WDT NMI is triggered (assert FNMIWDT) and the reset prewarning is
entered. The prewarning period lasts for 30H 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 0000H to the value obtained from the concatenation of WDTWINB and
00H.
After being serviced, the WDT continues counting up from the value (<WDTREL> * 28).
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 fPCLK/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:
(3.3)
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 24. This period can be calculated using the same formula by
replacing WDTREL with WDTWINB. For this feature to be useful, WDTWINB cannot be
smaller than WDTREL.
PWDT
2 1WDTIN
+
6
×
()
216 WDTREL
–
28
×
()
×
fPCLK
------------------------------------------------------------------------------------------------------
=
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相關代理商/技術參數(shù)
參數(shù)描述
SAX-XC878-16FFA5V 制造商:INFINEON 制造商全稱:Infineon Technologies AG 功能描述:8-Bit Single-Chip Microcontroller
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SAX-XC878C-13FFA 5V AA 功能描述:IC MCU 8BIT FLASH 64-LQFP RoHS:是 類別:集成電路 (IC) >> 嵌入式 - 微控制器， 系列:XC8xx 標準包裝:1,900 系列:XC8xx 核心處理器:XC800 芯體尺寸:8-位 速度:27MHz 連通性:CAN，SPI，SSI，UART/USART 外圍設備:欠壓檢測/復位，POR，PWM，WDT 輸入/輸出數(shù):40 程序存儲器容量:52KB（52K x 8） 程序存儲器類型:閃存 EEPROM 大小:- RAM 容量:3.25K x 8 電壓 - 電源 (Vcc/Vdd):4.5 V ~ 5.5 V 數(shù)據(jù)轉換器:A/D 8x10b 振蕩器型:內部 工作溫度:-40°C ~ 105°C 封裝/外殼:64-LQFP 包裝:帶卷 (TR)
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SAX-XC878C-16FFA 5V AA 功能描述:IC MCU 8BIT FLASH 64-LQFP RoHS:是 類別:集成電路 (IC) >> 嵌入式 - 微控制器， 系列:XC8xx 標準包裝:1,900 系列:XC8xx 核心處理器:XC800 芯體尺寸:8-位 速度:27MHz 連通性:CAN，SPI，SSI，UART/USART 外圍設備:欠壓檢測/復位，POR，PWM，WDT 輸入/輸出數(shù):40 程序存儲器容量:52KB（52K x 8） 程序存儲器類型:閃存 EEPROM 大小:- RAM 容量:3.25K x 8 電壓 - 電源 (Vcc/Vdd):4.5 V ~ 5.5 V 數(shù)據(jù)轉換器:A/D 8x10b 振蕩器型:內部 工作溫度:-40°C ~ 105°C 封裝/外殼:64-LQFP 包裝:帶卷 (TR)
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