4.7.3 CONFIG3

Windowed Watchdog Timer
Name: CONFIG3
Address: 0x300004

Configuration Word 3

Bit 15141312111098 
   WDTCCS[2:0]WDTCWS[2:0] 
Access R/WR/WR/WR/WR/WR/W 
Reset 111111 
Bit 76543210 
  WDTE[1:0]WDTCPS[4:0] 
Access R/WR/WR/WR/WR/WR/WR/W 
Reset 1111111 

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

ValueNameDescription
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?
Value Window Delay Percent of Time Window Opening Percent of Time
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

ValueDescription
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?
Value Divider Ratio Typical Time-Out

(FIN = 31 kHz)

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