參數(shù)資料
型號(hào)： AT43USB325E-AU
廠商： ATMEL CORP
元件分類： 微控制器/微處理器
英文描述： Multimedia USB Keyboard Controller with Embedded Hub
中文描述： 8-BIT, 12 MHz, RISC MICROCONTROLLER, PQFP64
封裝： 1.40 MM HEIGHT, GREEN, PLASTIC, MS-026ACB, LQFP-64
文件頁(yè)數(shù)： 54/109頁(yè)
文件大?。?/td> 643K
代理商： AT43USB325E-AU
54
3355C–USB–4/05
AT43USB325
6.5.1
Watch Dog Timer Control Register – WDTCR
Bits 7..5
–
Res: Reserved Bits
These bits are reserved bits in the AT43USB325 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 dis-
abled. 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.
Within the next four clock cycles, write a logical 0 to WDE. This disables the watchdog.
2.
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 Watch-
dog Timer is enabled. The different prescaling values and their corresponding Time-out Periods
are shown in
Table 6-8
.
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 pres-
cale 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 disabled 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 6-8.
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
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AT43USB326 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:Missed Watchdog Timer Reset
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