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W78LE812-24 Datasheet(PDF) 10 Page - Winbond |
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W78LE812-24 Datasheet(HTML) 10 Page - Winbond |
10 / 25 page W78LE812 - 10 - PS2, PS1, PS0 : Watch-dog prescaler timer select. Prescaler is selected when set PS2 −0 as follows: PS2 PS1 PS0 PRESCALER SELECT 0 0 0 2 0 0 1 4 0 1 0 8 0 1 1 16 1 0 0 32 1 0 1 64 1 1 0 128 1 1 1 256 The time-out period is obtained using the following equation : 1 2 1000 12 14 OSC PRESCALER × × × × mS Before Watchdog time-out occurs, the program must clear the 14-bit timer by writing 1 to WDTC.6 (CLRW). After 1 is written to this bit, the 14-bit timer , prescaler and this bit will be reset on the next instruction cycle. The Watchdog timer is cleared on reset. OSC 1/12 PRESCALER 14-BIT TIMER CLEAR CLRW EXTERNAL RESET INTERNAL RESET WIDL IDLE ENW Watchdog Timer Block Diagram Typical Watch-Dog time-out period when OSC = 20 MHz PS2 PS1 PS0 WATCHDOG TIME-OUT PERIOD 0 0 0 19.66 mS 0 0 1 39.32 mS 0 1 0 78.64 mS 0 1 1 157.28 mS 1 0 0 314.57 mS 1 0 1 629.14 mS 1 1 0 1.25 s 1 1 1 2.50 s |
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