ATMEGA163 ATMEL [ATMEL Corporation], ATMEGA163 Datasheet - Page 61

• Manufacturer Part Number: ATMEGA163
• Description: 8-bit Microcontroller with 16K Bytes In-System Programmable Flash
• Manufacturer: ATMEL [ATMEL Corporation]

1142E–AVR–02/03
1. In the same operation, write a logical one to WDTOE and WDE. A logical one
2. Within the next four clock cycles, write a logical 0 to WDE. This disables the
• 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 23.
Table 23. Watchdog Timer Prescale Select
WDP2
0
0
0
0
1
1
1
1
must be written to WDE even though it is set to one before the disable operation
starts.
Watchdog.
WDP1
0
0
1
1
0
0
1
1
WDP0
0
1
0
1
0
1
0
1
Oscillator Cycles
Number of WDT
1,024K cycles
2,048K cycles
128K cycles
256K cycles
512K cycles
16K cycles
32K cycles
64K cycles
Typical Time-out
at V
47 ms
94 ms
0.19 s
0.38 s
0.75 s
CC
1.5 s
3.0 s
6.0 s
= 3.0V
ATmega163(L)
Typical Time-out
at V
15 ms
30 ms
60 ms
0.12 s
0.24 s
0.49 s
0.97 s
CC
1.9 s
= 5.0V
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