PIC16F15213 datasheet(104/439 Pages) MICROCHIP

104 / 439 page

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WDTE[1:0]

SEN

Device Mode

WDT Mode

Awake

Active

Sleep

Disabled

Active

Disabled

14.2.1

WDT Is Always On

When the WDTE bits are set to ‘11’, the WDT is always on. The WDT protection is active during Sleep mode.

14.2.2

WDT Is Off During Sleep

When the WDTE bits are set to ‘10’, the WDT is on except during Sleep mode. During Sleep mode, the WDT

protection is disabled.

14.2.3

WDT Controlled by Software

When the WDTE bits are set to ‘01’, the WDT is controlled by the Software Watchdog Timer Enable (SEN) bit. When

SEN is set (SEN = 1), WDT protection is active. When SEN is clear (SEN = 0), WDT protection is disabled.

14.2.4

WDT Is Off

When the WDTE bits are set to ‘00’, the WDT is disabled. In this mode, the SEN bit is ignored.

14.3

WDT Time-Out Period

The Watchdog Timer Prescale Select (PS) bits set the time-out period from 1 ms to 256 seconds (nominal). After a

Reset, the default time-out period is two seconds.

14.4

Clearing the WDT

The WDT is cleared when any of the following conditions occur:

• Any Reset

• Valid CLRWDT instruction is executed

• Device enters Sleep

• Devices wakes up from Sleep

• Any write to the WDTCON register

14.5

WDT Operation During Sleep

When the WDT enters Sleep, the WDT is cleared. If the WDT is enabled during Sleep, the WDT resumes counting.

When the WDT exits Sleep, the WDT is cleared again.

When a WDT time-out occurs while the device is in Sleep, no Reset is generated. Instead, the device wakes up and

resumes operation. The Time-Out (TO) and Power-Down (PD) bits are cleared to indicate the event. Additionally, the

Watchdog Timer Reset Flag (RWDT) bit is cleared, indicating a WDT Reset event occurred.

14.6

PIC16F15213/14/23/24/43/44

WDT - Watchdog Timer

and its subsidiaries

Data Sheet

DS40002195E-page 104

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