PIC16F747 Microchip Technology Inc., PIC16F747 Datasheet - Page 189

• Manufacturer Part Number: PIC16F747
• Description: 28/40/44-pin, 8-bit Cmos Flash Microcontrollers With 10-bit A/d And Nanowatt Technology
• Manufacturer: Microchip Technology Inc.

REGISTER 15-4:
TABLE 15-6:
 2004 Microchip Technology Inc.
81h, 181h OPTION_REG RBPU INTEDG T0CS
2007h
105h
Legend:
Note 1:
Address
Configuration
bits
WDTCON
Shaded cells are not used by the Watchdog Timer.
See Register 15-1 for operation of these bits.
bit 7-5
bit 4-1
bit 0
(1)
Name
SUMMARY OF WATCHDOG TIMER REGISTERS
bit 7
Unimplemented: Read as ‘0’
WDTPS<3:0>: Watchdog Timer Period Select bits
0000 = 1:32 Prescale rate
0001 = 1:64 Prescale rate
0010 = 1:128 Prescale rate
0011 = 1:256 Prescale rate
0100 = 1:512 Prescale rate
0101 = 1:1024 Prescale rate
0110 = 1:2048 Prescale rate
0111 = 1:4096 Prescale rate
1000 = 1:8192 Prescale rate
1001 = 1:16394 Prescale rate
1010 = 1:32768 Prescale rate
1011 = 1:65536 Prescale rate
1100 = 1:1 Prescale rate
SWDTEN: Software Enable/Disable for Watchdog Timer bit
1 = WDT is turned on
0 = WDT is turned off
Legend:
R = Readable bit
-n = Value at POR
WDTCON: WATCHDOG TIMER CONTROL REGISTER (ADDRESS 105h)
Note 1: If WDTEN configuration bit = 1, then WDT is always enabled irrespective of this
BORV0 BOREN MCLRE FOSC2 PWRTEN WDTEN
U-0
Bit 7
—
—
Bit 6
control bit. If WDTEN configuration bit = 0, then it is possible to turn WDT on/off with
this control bit.
—
U-0
—
Bit 5
—
WDTPS3 WDTPS2 WSTPS1 WDTPS0 SWDTEN ---0 1000 ---0 1000
T0SE
U-0
Bit 4
W = Writable bit
‘1’ = Bit is set
—
Bit 3
WDTPS3
PSA
R/W-0
Bit 2
PS2
WDTPS2 WDTPS1 WDTPS0 SWDTEN
U = Unimplemented bit, read as ‘0’
‘0’ = Bit is cleared
R/W-1
FOSC1
Bit 1
PS1
(1)
R/W-0
FOSC0 1111 1111 1111 1111
Bit 0
PS0
PIC16F7X7
x = Bit is unknown
1111 1111 1111 1111
POR, BOR
Value on
R/W-0
DS30498C-page 187
Value on
R/W-0
all other
Resets
bit 0