PIC16F1613 datasheet(16/38 Pages) MICROCHIP

16 / 38 page

PIC12(L)F1612/16(L)F161X

DS40001720C-page 16

Preliminary

 2013-2014 Microchip Technology Inc.

4.2

Low-Voltage Programming (LVP) Mode

The Low-Voltage Programming mode allows devices to be programmed using VDD only, without high voltage. When the

LVP bit of Configuration Word 2 register 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’. This can only be done while in the High-Voltage Entry

mode.

Entry into the Low-Voltage ICSP Program/Verify modes requires the following steps:

MCLR is brought to VIL.

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

The key sequence is a specific 32-bit pattern, '0100 1101 0100 0011 0100 1000 0101 0000' (more easily

remembered as MCHP in ASCII). The device will enter Program/Verify mode only if the sequence is valid. The Least

Significant bit of the Least Significant nibble must be shifted in first.

Once the key sequence is complete, MCLR must be held at VIL for as long as Program/Verify mode is to be maintained.

For low-voltage programming timing, see Figure 8-8 and Figure 8-9.

Exiting Program/Verify mode is done by no longer driving MCLR to VIL. See Figure 8-8 and Figure 8-9.

Note:

To enter LVP mode, the LSB of the Least Significant nibble must be shifted in first. This differs from entering

the key sequence on other parts.

PIC16F1613 Datasheet(PDF) 16 Page - Microchip Technology