Upon the release of a POR or BOR, the following must occur before the device will begin executing:
The Power-up Timer runs independently of MCLR Reset. If MCLR is kept low long enough, the Power-up Timer will expire. Upon bringing MCLR high, the device will begin execution after 10 FOSC cycles (see Figure 1). This is useful for testing purposes or for synchronizing more than one device operating in parallel.