ATmega32U2 datasheet(60/314 Pages) ATMEL

60 / 314 page

7799B–AVR–07/09

ATmega8U2/16U2/32U2

Table 10-5.

Watchdog Timer Prescale Select, DIV = 2 (CLKwdt = CLK128 / 5)

WDP3

WDP2

WDP1

WDP0

Number of WDT Oscillator

Cycles before 1st time-out

(Early warning)

Early warning Typical

Time-out at

CC = 5.0V

Watchdog

Reset/Interrupt Typical

Time-out at

CC = 5.0V

0000

2K (2048) cycles

80 ms

160 ms

0001

4K (4096) cycles

160 ms

320 ms

0010

8K (8192) cycles

320 ms

640 ms

0011

16K (16384) cycles

0.625 s

1.25 s

0100

32K (32768) cycles

1.25 s

2.5 s

0101

64K (65536) cycles

2.5 s

5 s

0110

128K (131072) cycles

5 s

10 s

0111

256K (262144) cycles

10 s

20 s

1000

512K (524288) cycles

20 s

40 s

1001

1024K (1048576) cycles

40 s

80 s

1010

Reserved

1011

1100

1101

1110

1111

Table 10-6.

Watchdog Timer Prescale Select, DIV = 3 (CLKwdt = CLK128 / 7)

WDP3

WDP2

WDP1

WDP0

Number of WDT Oscillator

Cycles before 1st time-out

(Early warning)

Early warning Typical

Time-out at

CC = 5.0V

Watchdog

Reset/Interrupt Typical

Time-out at

CC = 5.0V

0000

2K (2048) cycles

112 ms

224 ms

0001

4K (4096) cycles

224 ms

448 ms

0010

8K (8192) cycles

448 ms

896 ms

0011

16K (16384) cycles

0.875 s

1.75 s

0100

32K (32768) cycles

1.75 s

3.5 s

0101

64K (65536) cycles

3.5 s

7 s

0110

128K (131072) cycles

7 s

14 s

0111

256K (262144) cycles

14 s

28 s

1000

512K (524288) cycles

28 s

56 s

1001

1024K (1048576) cycles

56 s

112 s

ATmega32U2 Datasheet(PDF) 60 Page - ATMEL Corporation

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