PIC16LF877A-I Datasheet, PDF (157/234 Pages) Microchip Technology – 28/40/44-Pin Enhanced Flash Microcontrollers

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.
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.
FIGURE 14-11: WATCHDOG TIMER BLOCK DIAGRAM
From TMR0 Clock Source
(Figure 5-1)
WDT Timer
0
1
M
U
X
Postscaler
8
WDT
Enable Bit
PSA
8-to-1 MUX
PS2:PS0
To TMR0 (Figure 5-1)
0
1
MUX
PSA
Note:
WDT
Time-out
PSA and PS2:PS0 are bits in the OPTION_REG register.
TABLE 14-7: SUMMARY OF WATCHDOG TIMER REGISTERS
Address
Name
Bit 7
Bit 6
Bit 5 Bit 4
Bit 3
2007h
Config. bits
(1) BODEN⁽¹⁾ CP1 CP0
81h, 181h OPTION_REG RBPU INTEDG T0CS T0SE
Legend: Shaded cells are not used by the Watchdog Timer.
Note 1: See Register 14-1 for operation of these bits.
PWRTE⁽¹⁾
PSA
Bit 2
WDTE
PS2
Bit 1
FOSC1
PS1
Bit 0
FOSC0
PS0
 2003 Microchip Technology Inc.
DS39582B-page 155