PIC16F882-I datasheet(230/328 Pages) MICROCHIP

230 / 328 page

PIC16F882/883/884/886/887

DS41291F-page 228

FIGURE 14-11:

TYPICAL IN-CIRCUIT

SERIAL

PROGRAMMING™

CONNECTION

14.10 Low-Voltage (Single-Supply) ICSP

Programming

The LVP bit of the Configuration Word enables

low-voltage ICSP programming. This mode allows the

microcontroller to be programmed via ICSP using a

VDD source in the operating voltage range. This only

means that VPP does not have to be brought to VIHH but

can instead be left at the normal operating voltage. In

this mode, the RB3/PGM pin is dedicated to the

programming function and ceases to be a general

purpose I/O pin. During programming, VDD is applied to

the MCLR pin. To enter Programming mode, VDD must

be applied to the RB3/PGM provided the LVP bit is set.

The LVP bit defaults to on (‘1’) from the factory.

If Low-Voltage Programming mode is not used, the LVP

bit can be programmed to a ‘0’ and RB3/PGM becomes

a digital I/O pin. However, the LVP bit may only be

programmed when programming is entered with VIHH

on MCLR. The LVP bit can only be charged when using

high voltage on MCLR.

It should be noted, that once the LVP bit is programmed

to ‘0’, only the High-Voltage Programming mode is

available and only High-Voltage Programming mode

can be used to program the device.

When using low-voltage ICSP, the part must be

supplied at 4.5V to 5.5V if a bulk erase will be executed.

This includes reprogramming of the code-protect bits

from an on state to an off state. For all other cases of

low-voltage ICSP, the part may be programmed at the

normal operating voltage. This means calibration

values, unique user IDs or user code can be

reprogrammed or added.

External

Connector

Signals

To Normal

Connections

To Normal

Connections

PIC16F882/883/

VDD

VSS

RE3/MCLR/VPP

RB6

RB7

+5V

VPP

CLK

Data I/O

Isolation devices (as required)

884/886/887

Note 1: The High-Voltage Programming mode is

always available, regardless of the state

of the LVP bit, by applying VIHH to the

MCLR pin.

2: While in Low-Voltage ICSP mode, the

RB3 pin can no longer be used as a

general purpose I/O pin.

3: When using Low-Voltage ICSP Program-

ming (LVP) and the pull-ups on PORTB

are enabled, bit 3 in the TRISB register

must be cleared to disable the pull-up on

RB3 and ensure the proper operation of

the device.

4: RB3 should not be allowed to float if LVP

is enabled. An external pull-down device

should be used to default the device to

normal operating mode. If RB3 floats

high, the PIC16F882/883/884/886/887

device will enter Programming mode.

5: LVP mode is enabled by default on all

devices shipped from Microchip. It can be

disabled by clearing the LVP bit in the

CONFIG register.

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