Microchip Technology AC244045 Data Sheet

DS41440C-page 330

 2010-2012 Microchip Technology Inc.

The Low-Voltage Programming Entry mode allows the
PIC16(L)F1825/1829 devices to be programmed using
V

DD

 only, without high voltage. When the LVP bit of

Configuration Word 2 is set to ‘1’, the low-voltage ICSP
programming entry is enabled. To disable the
Low-Voltage ICSP mode, the LVP bit must be
programmed to ‘0’. 
Entry into the Low-Voltage Programming Entry mode
requires the following steps:
1.

MCLR is brought to V

IL

.

2.

A 32-bit key sequence is presented on
ICSPDAT, while clocking ICSPCLK.

Once the key sequence is complete, MCLR must be
held at V

IL

 for as long as Program/Verify mode is to be

maintained.
If low-voltage programming is enabled (LVP = 1), the
MCLR Reset function is automatically enabled and
cannot be disabled. See 

 for more

information.
The LVP bit can only be reprogrammed to ‘0’ by using
the High-Voltage Programming mode.

Connection to a target device is typically done through
an ICSP™ header. A commonly found connector on
development tools is the RJ-11 in the 6P6C (6-pin, 6
connector) configuration. See 

.

Another connector often found in use with the PICkit™
programmers is a standard 6-pin header with 0.1 inch
spacing. Refer to 

. 

1

2

3

4

5

6

Target

Bottom Side

PC Board

V

PP

/MCLR

V

SS

ICSPCLK

V

DD

ICSPDAT

NC

Pin Description*

1 = V

PP

/MCLR

2 = V

DD

 Target

3 = V

SS

 (ground)

4 = ICSPDAT

5 = ICSPCLK

6 = No Connect

1
2
3

4
5
6

* The 6-pin header (0.100" spacing) accepts 0.025" square pins.

Pin Description*

1 = V

PP

/MCLR

2 = V

DD

 Target

3 = V

SS

 (ground)

4 = ICSPDAT
5 = ICSPCLK
6 = No Connect

Pin 1 Indicator