41594B datasheet(304/372 Pages) MICROCHIP

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PIC12LF1840T48A

DS41594B-page 304

Preliminary

 2011-2012 Microchip Technology Inc.

29.2

Low-Voltage Programming Entry

Mode

The Low-Voltage Programming Entry mode allows the

PIC12LF1840T48A device to be programmed using

VDD 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:

MCLR is brought to VIL.

A 32-bit key sequence is presented on

ICSPDAT, while clocking ICSPCLK.

Once the key sequence is complete, MCLR must be

held at VIL 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 Section 7.3 “MCLR” for more

information.

The LVP bit can only be reprogrammed to ‘0’ by using

the High-Voltage Programming mode.

29.3

Common Programming Interfaces

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 Figure 29-2.

FIGURE 29-2:

ICD RJ-11 STYLE

CONNECTOR INTERFACE

Another connector often found in use with the PICkit™

programmers is a standard 6-pin header with 0.1 inch

spacing. Refer to Figure 29-3.

FIGURE 29-3:

PICkit™ STYLE CONNECTOR INTERFACE

Target

Bottom Side

PC Board

VPP/MCLR

VSS

ICSPCLK

VDD

ICSPDAT

Pin Description*

1 = VPP/MCLR

2 = VDD Target

3 = VSS (ground)

4 = ICSPDAT

5 = ICSPCLK

6 = No Connect

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

Pin Description*

1 = VPP/MCLR

2 = VDD Target

3 = VSS (ground)

4 = ICSPDAT

5 = ICSPCLK

6 = No Connect

Pin 1 Indicator

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