PIC16F887I-PT Datasheet, PDF (229/338 Pages) Microchip Technology – 28/40/44-Pin Flash-Based, 8-Bit CMOS Microcontrollers

PIC16F882/883/884/886/887
REGISTER 14-3: 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⁽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 REGISTERS ASSOCIATED WITH WATCHDOG TIMER
Name
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Register
on Page
OPTION_REG RBPU INTEDG T0CS T0SE
PSA
PS2
PS1
PS0
32
WDTCON
—
—
— WDTPS3 WDTPS2 WSTPS1 WDTPS0 SWDTEN 229
Legend: Shaded cells are not used by the Watchdog Timer.
TABLE 14-9: SUMMARY OF CONFIGURATION WORD ASSOCIATED WITH WATCHDOG TIMER
Name
Bits Bit -/7 Bit -/6 Bit 13/5 Bit 12/4 Bit 11/3 Bit 10/2 Bit 9/1
Bit 8/0
Register
on Page
CONFIG1⁽¹⁾ 13:8
—
—
DEBUG LVP
FCMEN IESO BOREN 1 BOREN0 214
7:0 CPD
CP MCLRE PWRTE WDTE FOSC 2 FOSC 1 FOSC 0
Legend: – = unimplemented locations read as ‘0’. Shaded cells are not used by the Watchdog Timer.
Note 1: See Configuration Word Register 1 (Register 14-1) for operation of all register bits.
 2006-2012 Microchip Technology Inc.
DS41291G-page 229