PIC16F87-E Datasheet, PDF (144/228 Pages) Microchip Technology – 18/20/28-Pin Enhan lashMicrocontrollers with nanoWatt Technology

PIC16F87/88
REGISTER 15-3: WDTCON: WATCHDOG CONTROL REGISTER (ADDRESS 105h)
U-0
U-0
U-0
R/W-0
R/W-1 R/W-0 R/W-0
R/W-0
—
—
—
WDTPS3 WDTPS2 WDTPS1 WDTPS0 SWDTEN⁽¹⁾
bit 7
bit 0
bit 7-5
bit 4-1
bit 0
Unimplemented: Read as ‘0’
WDTPS<3:0>: Watchdog Timer Period Select bits
Bit Prescale
Value Rate
0000 = 1:32
0001 = 1:64
0010 = 1:128
0011 = 1:256
0100 = 1:512
0101 = 1:1024
0110 = 1:2048
0111 = 1:4096
1000 = 1:8192
1001 = 1:16394
1010 = 1:32768
1011 = 1:65536
SWDTEN: Software Enable/Disable for Watchdog Timer bit⁽¹⁾
1 = WDT is turned on
0 = WDT is turned off
Note 1: If WDTEN configuration bit = 1, then WDT is always enabled, irrespective of this
control bit. If WDTEN configuration bit = 0, then it is possible to turn WDT on/off with
this control bit.
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
TABLE 15-6: SUMMARY OF WATCHDOG TIMER REGISTERS
Address
Name
Bit 7 Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
81h,181h OPTION_REG
RBPU INTEDG T0CS T0SE
PSA
PS2
PS1
PS0
2007h Configuration bits LVP BOREN MCLRE FOSC2 PWRTEN WDTEN FOSC1 FOSC0
105h WDTCON
—
—
— WDTPS3 WDTPS2 WSTPS1 WDTPS0 SWDTEN
Legend: Shaded cells are not used by the Watchdog Timer.
Note 1: See Register 15-1 for operation of these bits.
DS30487C-page 142
 2005 Microchip Technology Inc.