AT90S1200 Ver la hoja de datos (PDF) - Atmel Corporation

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AT90S1200

8-Bit Microcontroller with 1K bytes In-System Programmable Flash

Atmel Corporation 

Table 6. Watchdog Timer Prescale Select

WDP2

0

WDP1

0

WDP0

0

Number of WDT

Oscillator Cycles

16K cycles

Typical Time-out

at VCC = 3.0V

47 ms

Typical Time-out

at VCC = 5.0V

15 ms

0

0

1

32K cycles

94 ms

30 ms

0

1

0

64K cycles

0.19 s

60 ms

0

1

1

128K cycles

0.38 s

0.12 s

1

0

0

256K cycles

0.75 s

0,24 s

1

0

1

512K cycles

1.5 s

0.49 s

1

1

0

1,024K cycles

3.0 s

0.97 s

1

Note:

1

1

2,048K cycles

6.0 s

1.9 s

The frequency of the Watchdog Oscillator is voltage dependent as shown in “Typical

Characteristics” on page 51.

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 prescale settings. If the Watchdog Timer is enabled without Reset, the

Watchdog Timer may not start to count from zero.

To avoid unintentional MCU resets, the Watchdog Timer should be disabled or reset

before changing the Watchdog Timer Prescale Select.

24 AT90S1200

0838H–AVR–03/02

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