Datasheet

 2001-2013 Microchip Technology Inc. DS39582C-page 155
PIC16F87XA
14.13 Watchdog Timer (WDT)
The Watchdog Timer is a free running, on-chip RC
oscillator which does not require any external
components. This RC oscillator is separate from the
RC oscillator of the OSC1/CLKI pin. That means that
the WDT will run even if the clock on the OSC1/CLKI
and OSC2/CLKO pins of the device has been stopped,
for example, by execution of a SLEEP instruction.
During normal operation, a WDT time-out generates a
device Reset (Watchdog Timer Reset). If the device is
in Sleep mode, a WDT time-out causes the device to
wake-up and continue with normal operation (Watch-
dog Timer Wake-up). The TO
bit in the Status register
will be cleared upon a Watchdog Timer time-out.
The WDT can be permanently disabled by clearing
configuration bit, WDTE (Section 14.1 “Configuration
Bits”).
WDT time-out period values may be found in
Section 17.0 “Electrical Characteristics” under
parameter #31. Values for the WDT prescaler (actually
a postscaler but shared with the Timer0 prescaler) may
be assigned using the OPTION_REG register.
FIGURE 14-11: WATCHDOG TIMER BLOCK DIAGRAM
TABLE 14-7: SUMMARY OF WATCHDOG TIMER REGISTERS
Note 1: The CLRWDT and SLEEP instructions
clear the WDT and the postscaler, if
assigned to the WDT and prevent it from
timing out and generating a device Reset
condition.
2: 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 5-1)
To TMR0 (Figure 5-1)
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
8
Note: PSA and PS2:PS0 are bits in the OPTION_REG register.
Address Name Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
2007h Config. bits (1) BODEN
(1)
CP1 CP0 PWRTE
(1)
WDTE FOSC1 FOSC0
81h, 181h OPTION_REG
RBPU INTEDG T0CS T0SE PSA PS2 PS1 PS0
Legend: Shaded cells are not used by the Watchdog Timer.
Note 1: See Register 14-1 for operation of these bits.