ATmega32U2 datasheet(62/314 Pages) ATMEL

62 / 314 page

7799B–AVR–07/09

ATmega8U2/16U2/32U2

Table 10-8.

Watchdog Timer Prescale Select, DIV = 5 (CLKwdt = CLK128 / 11)

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

88 ms

176 ms

0001

4K (4096) cycles

176 ms

352 ms

0010

8K (8192) cycles

352 ms

704 ms

0011

16K (16384) cycles

704 ms

1.4 s

0100

32K (32768) cycles

1.4 s

2.8 s

0101

64K (65536) cycles

2.8 s

5.6 s

0110

128K (131072) cycles

5.6 s

11.2 s

0111

256K (262144) cycles

11.2 s

22.5 s

1000

512K (524288) cycles

22.5 s

45 s

1001

1024K (1048576) cycles

45s

90 s

1010

Reserved

1011

1100

1101

1110

1111

Table 10-9.

Watchdog Timer Prescale Select, DIV = 6(CLKwdt = CLK128 / 13)

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

104 ms

208 ms

0001

4K (4096) cycles

208 ms

416 ms

0010

8K (8192) cycles

416 ms

832 ms

0011

16K (16384) cycles

832 ms

1.64 s

0100

32K (32768) cycles

1.6 s

3.3 s

0101

64K (65536) cycles

3.3 s

6.6 s

0110

128K (131072) cycles

6.6 s

13.3 s

0111

256K (262144) cycles

13.3 s

26.6 s

1000

512K (524288) cycles

26.6 s

53.2 s

1001

1024K (1048576) cycles

53.2 s

106.4 s

ATmega32U2 Datasheet(PDF) 62 Page - ATMEL Corporation

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