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参数资料
型号： SAF-XC888C-8FFA3V3
厂商： INFINEON TECHNOLOGIES AG
元件分类： 微控制器/微处理器
英文描述： 8-BIT, FLASH, 24 MHz, MICROCONTROLLER, PQFP64
封装： PLASTIC, TQFP-64
文件页数： 132/144页
文件大小： 1455K
代理商： SAF-XC888C-8FFA3V3
XC886/888CLM
Functional Description
Data Sheet
81
V1.2, 2009-07
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:
(3.4)
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 29. 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
---------------------------------------------------------------------------------------------------------
=
相关PDF资料
PDF描述
SAF-XC888C-8FFI5V 8-BIT, FLASH, 24 MHz, MICROCONTROLLER, PQFP64
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相关代理商/技术参数
参数描述
SAF-XC888C-8FFI 制造商:INFINEON 制造商全称:Infineon Technologies AG 功能描述:8-Bit Single-Chip Microcontroller
SAF-XC888C-8FFI 3V3 AC 功能描述:8位微控制器 -MCU 8-Bit Single-Chip 3.3V 24MHz Flash RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT
SAF-XC888C-8FFI 5V AC 功能描述:8位微控制器 -MCU MICROCONTROLLER 8-BIT RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT
SAF-XC888C-8FFI3V3AC 功能描述:8位微控制器 -MCU 32KB FLASH 256 B RAM 2xUART SPI RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT
SAF-XC888CLM-6FFA 制造商:Rochester Electronics LLC 功能描述: 制造商:Infineon Technologies AG 功能描述:
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