參數資料
型號： AT43USB355E-AU
廠商： ATMEL CORP
元件分類： 微控制器/微處理器
英文描述： Full-speed USB Microcontroller with Embedded Hub, ADC and PWM
中文描述： 8-BIT, 12 MHz, RISC MICROCONTROLLER, PQFP64
封裝： 1.40 MM, GREEN, PLASTIC, MS-026ACB, LQFP-64
文件頁數： 52/115頁
文件大?。?/td> 610K
代理商： AT43USB355E-AU
52
AT43USB355
2603G–USB–04/06
Watchdog Timer Control Register – WDTCR
Bits 7..5
–
Res: Reserved Bits
These bits are reserved bits in the AT43USB355 and will always read as zero.
Bit 4
–
WDTOE: Watch Dog Turn-Off Enable
This bit must be set (one) when the WDE bit is cleared. Otherwise, the watchdog will not be
disabled. Once set, the hardware will clear this bit to zero after four clock cycles. Refer to the
description of the WDE bit for a watchdog disable procedure.
Bit 3
–
WDE: Watch Dog Enable
When the WDE is set (one) the Watchdog Timer is enabled, and if the WDE is cleared (zero)
the Watchdog Timer function is disabled. WDE can only be cleared if the WDTOE bit is set
(one). To disable an enabled watchdog timer, the following procedure must be followed:
1.
In the same operation, write a logical one to WDTOE and WDE. A logical 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 logical 0 to WDE. This disables the watchdog.
Bits 2..0
–
WDP2, WDP1, WDP0: Watch Dog Timer Prescaler 2, 1 and 0
The WDP2, WDP1 and WDP0 bits determine the Watchdog Timer prescaling when the
Watchdog Timer is enabled. The different prescaling values and their corresponding Time-out
Periods are shown in Table 18.
Note:
The WDR (Watchdog Reset) instruction should always be executed before the Watchdog Timer
is enabled. This ensures that the reset period will be in accordance with the Watchdog Timer
prescale settings. If the Watchdog Timer is enabled without reset, the watchdog timer may not
start to count from zero. To avoid unintentional MCU reset, the Watchdog Timer should be dis-
abled or reset before changing the Watchdog Timer Prescale Select.
Bit
7
6
5
4
3
2
1
0
$21 ($41)
–
–
–
WDTOE
WDE
WDP2
WDP1
WDP0
WDTCR
Read/Write
R
R
R
R/W
R/W
R/W
R/W
R/W
Initial Value
0
0
0
0
0
0
0
0
Table 18.
Watchdog Timer Prescale Select
WDP2
WDP1
WDP0
Number of WDT Oscillator cycles
Time-out
0
0
0
8K cycles
8.2 ms
0
0
1
16K cycles
16.4 ms
0
1
0
32K cycles
33.8 ms
0
1
1
64K cycles
65.6 ms
1
0
0
128K cycles
0.131 s
1
0
1
256K cycles
0.262 s
1
1
0
512K cycles
0.524 s
1
1
1
1,024K cycles
1.048 s
相關PDF資料
PDF描述
AT43USB355M-AC Full-speed USB Microcontroller with Embedded Hub, ADC and PWM
AT43USB355M-AU Full-speed USB Microcontroller with Embedded Hub, ADC and PWM
AT43USB380 On-The-Go Upgrade of the AT43USB370 USB 2.0 Full-Speed Host/Function Processor
AT45BR3214B 32-MEGABIT DATAFLASH + 4-MEGABIT SRAM STACK MEMORY
AT45BR3214B-C1 32-MEGABIT DATAFLASH + 4-MEGABIT SRAM STACK MEMORY
相關代理商/技術參數
參數描述
AT43USB355M-AC 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:Full-speed USB Microcontroller with Embedded Hub, ADC and PWM
AT43USB355M-AU 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:Full-speed USB Microcontroller with Embedded Hub, ADC and PWM
AT43USB370 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:USB 2.0 Full-Speed Host/Function Processor
AT43USB370E-AC 功能描述:USB 接口集成電路 USB HOST DEVICE CONTROL - COM TEMP RoHS:否 制造商:Cypress Semiconductor 產品:USB 2.0 數據速率: 接口類型:SPI 工作電源電壓:3.15 V to 3.45 V 工作電源電流: 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:WLCSP-20
AT43USB380 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:On-The-Go Upgrade of the AT43USB370 USB 2.0 Full-Speed Host/Function Processor
發(fā)布緊急采購，3分鐘左右您將得到回復。

采購需求

(若只采購一條型號，填寫一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購。也可以進入我的后臺，查看報價

發(fā)布成功！您可以繼續(xù)發(fā)布采購。也可以進入我的后臺，查看報價

*型號 *數量 廠商 批號 封裝
添加更多采購

我的聯系方式

*
*
*