PIC18F26/45/46Q10

4.7.3 CONFIG3

Windowed Watchdog Timer

Name:	CONFIG3
Address:	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; the SEN bit in WDTCON0 is ignored
10	WDT enabled while Sleep = `0`, suspended when Sleep = `1`; the SEN bit in WDTCON0 is ignored
01	WDT enabled/disabled by the SEN bit in WDTCON0
00	WDT disabled; the 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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