參數(shù)資料
型號: ATMEGA8
廠商: Atmel Corp.
元件分類: 8位微控制器
英文描述: -bit AVR Microcontroller with 8K Bytes In- System Programmable Flash
中文描述: 位AVR微控制器具有8K字節(jié)的系統(tǒng)內(nèi)可編程閃存
文件頁數(shù): 112/125頁
文件大小: 6456K
代理商: ATMEGA8
44
2486AA–AVR–02/2013
ATmega8(L)
Bit 3 – WDE: Watchdog Enable
When the WDE is written to logic one, the Watchdog Timer is enabled, and if the WDE is written
to logic zero, the Watchdog Timer function is disabled. WDE can only be cleared if the WDCE bit
has logic level one. To disable an enabled Watchdog Timer, the following procedure must be
followed:
1.
In the same operation, write a logic one to WDCE and WDE. A logic one must be written
to WDE even though it is set to one before the disable operation starts
2.
Within the next four clock cycles, write a logic 0 to WDE. This disables the Watchdog
Bits 2..0 – WDP2, WDP1, WDP0: Watchdog Timer Prescaler 2, 1, and 0
The WDP2, WDP1, and WDP0 bits determine the Watchdog Timer prescaling when the Watch-
dog Timer is enabled. The different prescaling values and their corresponding Timeout Periods
are shown in Table 17.
The following code example shows one assembly and one C function for turning off the WDT.
The example assumes that interrupts are controlled (for example, by disabling interrupts glob-
ally) so that no interrupts will occur during execution of these functions.
Table 17. Watchdog Timer Prescale Select
WDP2
WDP1
WDP0
Number of WDT
Oscillator Cycles
Typical Time-out
at VCC = 3.0V
Typical Time-out
at VCC = 5.0V
0
16K (16,384)
17.1ms
16.3ms
0
1
32K (32,768)
34.3ms
32.5ms
0
1
0
64K (65,536)
68.5ms
65ms
0
1
128K (131,072)
0.14s
0.13s
1
0
256K (262,144)
0.27s
0.26s
1
0
1
512K (524,288)
0.55s
0.52s
1
0
1,024K (1,048,576)
1.1s
1.0s
1
2,048K (2,097,152)
2.2s
2.1s
相關(guān)PDF資料
PDF描述
ATMEGA8515 -bit AVR Microcontroller with 8K Bytes In- System Programmable Flash
ATMEGA88 -bit AVR Microcontroller with 8K Bytes In- System Programmable Flash
AT93C56A-10PI-2.7 3-wire Serial EEPROMs 2K (256 x 8 or 128 x 16)
AT93C56A-10SI-1.8 3-wire Serial EEPROMs 2K (256 x 8 or 128 x 16)
AT93C56A-10SI-2.7 3-wire Serial EEPROMs 2K (256 x 8 or 128 x 16)
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
ATMEGA8-16AC 功能描述:8位微控制器 -MCU AVR 8K FLASH 512B EE 1K SRAM ADC RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風格:SMD/SMT
ATMEGA8-16AI 功能描述:8位微控制器 -MCU AVR 8K FLASH 512B EE 1K SRAM ADC RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風格:SMD/SMT
ATMEGA8-16AI SL383 制造商:Atmel Corporation 功能描述:MCU 8-Bit ATmega AVR RISC 8KB Flash 5V 32-Pin TQFP T/R
ATMEGA8-16AJ 功能描述:IC MCU AVR 8K 5V 16MHZ 32-TQFP RoHS:是 類別:集成電路 (IC) >> 嵌入式 - 微控制器, 系列:AVR® ATmega 標準包裝:9 系列:87C 核心處理器:8051 芯體尺寸:8-位 速度:40/20MHz 連通性:UART/USART 外圍設(shè)備:POR,WDT 輸入/輸出數(shù):32 程序存儲器容量:32KB(32K x 8) 程序存儲器類型:OTP EEPROM 大小:- RAM 容量:256 x 8 電壓 - 電源 (Vcc/Vdd):4.5 V ~ 5.5 V 數(shù)據(jù)轉(zhuǎn)換器:- 振蕩器型:內(nèi)部 工作溫度:0°C ~ 70°C 封裝/外殼:40-DIP(0.600",15.24mm) 包裝:管件
ATmega8-16AU 功能描述:8位微控制器 -MCU 8kB Flash 0.5kB EEPROM 23 I/O Pins RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風格:SMD/SMT