PIC18LF24K Datasheet, PDF (84/594 Pages) –

PIC18(L)F26/45/46K40
9.1 Register Definitions: Windowed Watchdog Timer Control
REGISTER 9-1: WDTCON0: WATCHDOG TIMER CONTROL REGISTER 0
U-0
U-0
R/W⁽³⁾-q/q⁽²⁾ R/W⁽³⁾-q/q⁽²⁾ R/W⁽³⁾-q/q⁽²⁾ R/W⁽³⁾-q/q⁽²⁾ R/W⁽³⁾-q/q⁽²⁾
—
—
WDTPS<4:0>
bit 7
R/W-0/0
SEN
bit 0
Legend:
R = Readable bit
u = Bit is unchanged
‘1’ = Bit is set
W = Writable bit
x = Bit is unknown
‘0’ = Bit is cleared
U = Unimplemented bit, read as ‘0’
-n/n = Value at POR and BOR/Value at all other Resets
q = Value depends on condition
bit 7-6
bit 5-1
Unimplemented: Read as ‘0’
WDTPS<4:0>: Watchdog Timer Prescale Select bits⁽¹⁾
Bit Value = Prescale Rate
11111 = Reserved. Results in minimum interval (1:32)
•
•
•
10011 = Reserved. Results in minimum interval (1:32)
10010 = 1:8388608 (2²³) (Interval 256s nominal)
10001 = 1:4194304 (2²²) (Interval 128s nominal)
10000 = 1:2097152 (2²¹) (Interval 64s nominal)
01111 = 1:1048576 (2²⁰) (Interval 32s nominal)
01110 = 1:524288 (2¹⁹) (Interval 16s nominal)
01101 = 1:262144 (2¹⁸) (Interval 8s nominal)
01100 = 1:131072 (2¹⁷) (Interval 4s nominal)
01011 = 1:65536 (Interval 2s nominal) (Reset value)
01010 = 1:32768 (Interval 1s nominal)
01001 = 1:16384 (Interval 512 ms nominal)
01000 = 1:8192 (Interval 256 ms nominal)
00111 = 1:4096 (Interval 128 ms nominal)
00110 = 1:2048 (Interval 64 ms nominal)
00101 = 1:1024 (Interval 32 ms nominal)
00100 = 1:512 (Interval 16 ms nominal)
00011 = 1:256 (Interval 8 ms nominal)
00010 = 1:128 (Interval 4 ms nominal)
00001 = 1:64 (Interval 2 ms nominal)
00000 = 1:32 (Interval 1 ms nominal)
bit 0
SEN: Software Enable/Disable for Watchdog Timer bit
If WDTE<1:0> = 1x:
This bit is ignored.
If WDTE<1:0> = 01:
1 = WDT is turned on
0 = WDT is turned off
If WDTE<1:0> = 00:
This bit is ignored.
Note 1:
2:
3:
Times are approximate. WDT time is based on 31 kHz LFINTOSC.
When WDTCPS <4:0> in CONFIG3L = 11111, the Reset value of WDTPS<4:0> is 01011. Otherwise, the
Reset value of WDTPS<4:0> is equal to WDTCPS<4:0> in CONFIG3L.
When WDTCPS <4:0> in CONFIG3L ≠ 11111, these bits are read-only.
 2016 Microchip Technology Inc.
Preliminary
DS40001816C-page 84