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PIC16C63A/65B/73B/74B
DS30605C-page 96
2000 Microchip Technology Inc.
13.7.2
WDT PROGRAMMING
CONSIDERATIONS
It should also be taken into account that under worst
case conditions (V
DD
= Min., Temperature = Max., and
max. WDT prescaler), it may take several seconds
before a WDT time-out occurs.
FIGURE 13-6:
WATCHDOG TIMER BLOCK DIAGRAM
TABLE 13-7:
SUMMARY OF WATCHDOG TIMER REGISTERS
Note:
When a
CLRWDT
instruction is executed
and the prescaler is assigned to the WDT,
the prescaler count will be cleared, but the
prescaler assignment is not changed.
From TMR0 Clock Source
(Figure 6-1)
To TMR0 MUX (Figure 6-1)
Postscaler
WDT Timer
WDT
Enable Bit
0
1
M
U
X
PSA
8 - to - 1 MUX
PS2:PS0
0
1
MUX
PSA
WDT
Time-out
Note: PSA and PS2:PS0 are bits in the OPTION register.
8
Address
Name
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
2007h
Config. bits
–
BODEN
(1)
CP1
CP0
PWRTE
(1)
WDTE
FOSC1
FOSC0
81h
OPTION_REG
RBPU
INTEDG
T0CS
T0SE
PSA
PS2
PS1
PS0
Legend: Shaded cells are not used by the Watchdog Timer.
Note 1: See Register 13-1 for operation of these bits.
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