Microchip Technology DM163025-1 Data Sheet

DS30684A-page 404

 2012 Microchip Technology Inc.

The LVP Configuration bit enables Single-Supply ICSP
Programming (formerly known as Low-Voltage ICSP
Programming or LVP). When Single-Supply Program-
ming is enabled, the microcontroller can be programmed
without requiring high voltage being applied to the
MCLR/V

PP

/RE3 pin. See “PIC18(L)F2X/4XK50 Flash

” (DS41630) for

more details about low voltage programming. 

The LVP bit may be set or cleared only when using
standard high-voltage programming (V

IHH

 applied to

the MCLR/V

PP

/RE3 pin). Once LVP has been disabled,

only the standard high-voltage programming is
available and must be used to program the device. 
Memory that is not code-protected can be erased using
either a block erase, or erased row by row, then written
at any specified V

DD

. If code-protected memory is to be

erased, a block erase is required.

High-voltage programming is always
available, regardless of the state of the
LVP bit, by applying V

IHH

 to the MCLR

pin.

By default, Single-Supply ICSP is
enabled in unprogrammed devices (as
supplied from Microchip) and erased
devices.

While in Low-Voltage ICSP mode, MCLR
is always enabled, regardless of the
MCLRE bit, and the RE3 pin can no
longer be used as a general purpose
input.