W78LE365_07 Datasheet, PDF (18/42 Pages) Winbond – 8-BIT MICROCONTROLLER

W78LE365/W78L365A
PS2, PS1, PS0: Watch-dog prescaler timer select. Prescaler is selected when set PS2−0 as follows:
PS2 PS1 PS0
00 0
00 1
01 0
01 1
10 0
10 1
11 0
11 1
PRESCALER SELECT
2
4
8
16
32
64
128
256
The time-out period is obtained using the following equation:
1 _{× 214 × PRESCALER × 1000 × 12 mS}
OSC
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.
WIDL
IDLE
OSC
1/12
ENW
EXTERNAL
RESET
PRESCALER
14-BIT TIMER
CLEAR
INTERNAL
RESET
Watchdog Timer Block Diagram
CLRW
Typical Watch-Dog time-out period when OSC = 20 MHz
PS2 PS1 PS0
00 0
00 1
01 0
01 1
10 0
10 1
11 0
11 1
WATCHDOG TIME-OUT PERIOD
19.66 mS
39.32 mS
78.64 mS
157.28 mS
314.57 mS
629.14 mS
1.25 S
2.50 S
- 18 -