PIC16F946 Datasheet, PDF (209/274 Pages) Microchip Technology – 64-Pin Flash-Based, 8-Bit CMOS Microcontrollers with LCD Driver and nanoWatt Technology

PIC16F946
REGISTER 16-2:
WDTCON – WATCHDOG TIMER 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
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 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.
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 16-8: SUMMARY OF WATCHDOG TIMER REGISTERS
Address
Name
Bit 7 Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
105h WDTCON
—
—
— WDTPS3 WDTPS2 WSTPS1 WDTPS0 SWDTEN
81h
OPTION_REG
RBPU INTEDG T0CS
T0SE
PSA
2007h⁽¹⁾ CONFIG
CPD
CP
MCLRE PWRTE WDTE
Legend: Shaded cells are not used by the Watchdog Timer.
Note 1: See Register 16-1 for operation of all Configuration Word register bits.
PS2
PS1
PS0
FOSC2 FOSC1 FOSC0
© 2005 Microchip Technology Inc.
Preliminary
DS41265A-page 207