The Power-up Timer provides a nominal 72 millisecond delay after a Power On Reset (POR), Brown Out Reset (BOR) or after MCLR pin reset is initiated. The PWRT operates on a dedicated internal RC Oscillator. The device is kept in reset as long as the PWRT has not timed out. The PWRT is used to allow the Vdd voltage of the PIC® MCU to rise to an acceptable level before operating. The PWRT delay may vary from device to device due to Vdd, temperature, and process variations. The DC parameters section of the device data sheet will specify the details.
For most applications we recommend enabling the PWRT, especially when the BOR is enabled, since the voltage level of brownout may be just below the trigger point and the extra PWRT delay will guarantee a stable return from reset.
The PWRT has an enable/disable bit in the configuration registers for the device. For newer devices, the PWRTE bit is set to zero (0) to enable the PWRT. On older devices the enable is set to one (1).
Refer to the device data sheet to confirm the proper setting.
The PIC16F1713/6 data sheet shows the PWRTE bit in the CONFIG1 register.