V_DD-First Entry Mode

To enter the Program/Verify mode via the V_DD-First Entry mode, the following sequence must be followed:

1. 1. Hold ICSPCLK and ICSPDAT low.
2. 2. Raise the voltage on V_DD from 0V to the desired operating voltage.
3. 3.Raise the voltage on MCLR from V_DD or below to V_IHH.

The V_DD-First Entry mode is useful for programming the device when the V_DD is already applied. It is not necessary to disconnect V_DD to enter the Program/Verify mode. See the timing diagram in Figure 1.

Figure 1. Programming Entry and Exit Modes – V_DD-First and Last