PIC16F636T-I Datasheet, PDF (146/234 Pages) Microchip Technology – 8/14-Pin, Flash-Based 8-Bit CMOS Microcontrollers with nanoWatt Technology

PIC12F635/PIC16F636/639
REGISTER 12-2: 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
Note 1:
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)
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 12-8: SUMMARY OF REGISTERS ASSOCIATED WITH WATCHDOG TIMER
Name
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Value on
POR, BOR
WDTCON
—
—
—
WDTPS3 WDTPS2 WSTPS1
OPTION_REG
RAPU INTEDG T0CS
T0SE
PSA
PS2
CONFIG
CPD
CP
MCLRE PWRTE WDTE FOSC2
Legend: Shaded cells are not used by the Watchdog Timer.
Note 1: See Register 12-1 for operation of all Configuration Word register bits.
WDTPS0
PS1
FOSC1
SWDTEN
PS0
FOSC0
---0 1000
1111 1111
—
Value on
all other
Resets
---0 1000
1111 1111
—
DS41232D-page 144
© 2007 Microchip Technology Inc.