PIC18(L)F26/45/46K40

3.7.3 CONFIG3

Windowed Watchdog Timer

Name:	CONFIG3
Offset:	0x300004

Configuration Word 3


Bit	15	14	13	12	11	10	9	8
			WDTCCS[2:0]			WDTCWS[2:0]
Access			R/W	R/W	R/W	R/W	R/W	R/W
Reset			1	1	1	1	1	1


Bit	7	6	5	4	3	2	1	0
		WDTE[1:0]		WDTCPS[4:0]
Access		R/W	R/W	R/W	R/W	R/W	R/W	R/W
Reset		1	1	1	1	1	1	1

Bits 13:11 – WDTCCS[2:0] WDT Input Clock Selector bits

Value	Name	Description
x	WDTE=00	These bits have no effect
111	WDTE≠00	Software Control
110 to 010	WDTE≠00	Reserved (Default to LFINTOSC)
001	WDTE≠00	WDT reference clock is the 31.25 kHz MFINTOSC
000	WDTE≠00	WDT reference clock is the 31.0 kHz LFINTOSC (default value)

Bits 10:8 – WDTCWS[2:0] WDT Window Select bits


WDTCWS	WDTCON1[WINDOW] at POR			Software control of WINDOW	Keyed access required?
WDTCWS	Value	Window delay Percent of time	Window opening Percent of time	Software control of WINDOW	Keyed access required?
111	111	n/a	100	Yes	No
110	110	n/a	100	No	Yes
101	101	25	75
100	100	37.5	62.5
011	011	50	50
010	010	62.5	37.5
001	001	75	25
000	000	87.5	12.5

Bits 6:5 – WDTE[1:0] WDT Operating Mode bits

Value	Description
11	WDT enabled regardless of Sleep; SEN bit in WDTCON0 is ignored
10	WDT enabled while Sleep = `0`, suspended when Sleep = `1`; SEN bit in WDTCON0 is ignored
01	WDT enabled/disabled by SEN bit in WDTCON0
00	WDT disabled, SEN bit in WDTCON0 is ignored

Bits 4:0 – WDTCPS[4:0] WDT Period Select bits


WDTCPS	WDTCON0[WDTPS] at POR				Software Control of WDTPS?
WDTCPS	Value	Divider Ratio		Typical Time Out (F_IN = 31 kHz)	Software Control of WDTPS?
11111	01011	1:65536	2¹⁶	2s	Yes
11110 ... 10011	11110 ... 10011	1:32	2⁵	1 ms	No
10010	10010	1:8388608	2²³	256s	No
10001	10001	1:4194304	2²²	128s
10000	10000	1:2097152	2²¹	64s
01111	01111	1:1048576	2²⁰	32s
01110	01110	1:524299	2¹⁹	16s
01101	01101	1:262144	2¹⁸	8s
01100	01100	1:131072	2¹⁷	4s
01011	01011	1:65536	2¹⁶	2s
01010	01010	1:32768	2¹⁵	1s
01001	01001	1:16384	2¹⁴	512 ms
01000	01000	1:8192	2¹³	256 ms
00111	00111	1:4096	2¹²	128 ms
00110	00110	1:2048	2¹¹	64 ms
00101	00101	1:1024	2¹⁰	32 ms
00100	00100	1:512	2⁹	16 ms
00011	00011	1:256	2⁸	8 ms
00010	00010	1:128	2⁷	4 ms
00001	00001	1:64	2⁶	2 ms
00000	00000	1:32	2⁵	1 ms

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