參數(shù)資料
型號: S80C32-44:RD
廠商: ATMEL CORP
元件分類: 微控制器/微處理器
英文描述: 8-BIT, 44 MHz, MICROCONTROLLER, PQCC44
封裝: PLASTIC, LCC-44
文件頁數(shù): 133/152頁
文件大?。?/td> 2528K
43
ATmega8535(L)
2502K–AVR–10/06
if the WDCE bit has logic level one. To disable an enabled Watchdog Timer, the follow-
ing 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.
In safety level 2, it is not possible to disable the Watchdog Timer, even with the algo-
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
Watchdog Timer is enabled. The different prescaling values and their corresponding
Timeout Periods are shown in Table 18.
Note:
1. Values are guidelines only.
Table 18. 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)
17.1 ms
16.3 ms
0
1
32K (32,768)
34.3 ms
32.5 ms
0
1
0
64K (65,536)
68.5 ms
65 ms
0
1
128K (131,072)
0.14 s
0.13 s
1
0
256K (262,144)
0.27 s
0.26 s
1
0
1
512K (524,288)
0.55 s
0.52 s
1
0
1,024K (1,048,576)
1.1 s
1.0 s
1
2,048K (2,097,152)
2.2 s
2.1 s
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