PIC16F631_08 Datasheet, PDF (215/306 Pages) Microchip Technology – 20-Pin Flash-Based, 8-Bit CMOS Microcontrollers with nanoWatt Technology

PIC16F631/677/685/687/689/690
REGISTER 14-2: WDTCON: WATCHDOG TIMER CONTROL REGISTER
U-0
—
bit 7
U-0
U-0
R/W-0
R/W-1
R/W-0
—
—
WDTPS3 WDTPS2 WDTPS1
R/W-0
WDTPS0
R/W-0
SWDTEN⁽¹⁾
bit 0
Legend:
R = Readable bit
-n = Value at POR
W = Writable bit
‘1’ = Bit is set
U = Unimplemented bit, read as ‘0’
‘0’ = Bit is cleared
x = Bit is unknown
bit 7-5
bit 4-1
bit 0
Unimplemented: Read as ‘0’
WDTPS<3:0>: Watchdog Timer Period Select bits
Bit Value = Prescale Rate
0000 = 1:32
0001 = 1:64
0010 = 1:128
0011 = 1:256
0100 = 1:512 (Reset value)
0101 = 1:1024
0110 = 1:2048
0111 = 1:4096
1000 = 1:8192
1001 = 1:16384
1010 = 1:32768
1011 = 1:65536
1100 = reserved
1101 = reserved
1110 = reserved
1111 = reserved
SWDTEN: Software Enable or Disable the Watchdog Timer bit⁽¹⁾
1 = WDT is turned on
0 = WDT is turned off (Reset value)
Note 1: If WDTE Configuration bit = 1, then WDT is always enabled, irrespective of this control bit. If WDTE
Configuration bit = 0, then it is possible to turn WDT on/off with this control bit.
TABLE 14-8: SUMMARY OF WATCHDOG TIMER REGISTER
Name
Bit 7 Bit 6 Bit 5 Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Value on
POR, BOR
Value on
all other
Resets
CONFIG⁽¹⁾
CPD
CP MCLRE PWRTE WDTE FOSC2 FOSC1 FOSC0
—
—
OPTION_REG RABPU INTEDG T0CS T0SE
PSA
PS2
PS1
PS0 1111 1111 1111 1111
WDTCON
—
—
— WDTPS3 WDTPS2 WSTPS1 WDTPS0 SWDTEN ---0 1000 ---0 1000
Legend: Shaded cells are not used by the Watchdog Timer.
Note 1: See Register 14-1 for operation of all Configuration Word register bits.
© 2008 Microchip Technology Inc.
DS41262E-page 213