PIC16F722-ESLASHML datasheet(195/302 Pages) MICROCHIP

195 / 302 page

DS41341E-page 195

PIC16F72X/PIC16LF72X

20.0

IN-CIRCUIT SERIAL

PROGRAMMING™ (ICSP™)

ICSP™ programming allows customers to manufacture

circuit boards with unprogrammed devices. Programming

can be done after the assembly process allowing the

device to be programmed with the most recent firmware

or a custom firmware. Five pins are needed for ICSP™

programming:

• ICSPCLK

• ICSPDAT

•MCLR/VPP

•VDD

•VSS

The device is placed into Program/Verify mode by

holding the ICSPCLK and ICSPDAT pins low then

raising the voltage on MCLR/VPP from 0v to VPP. In

Program/Verify mode the Program Memory, User IDs

and the Configuration Words are programmed through

serial

communications.

The

ICSPDAT

bidirectional I/O used for transferring the serial data and

the ISCPCLK pin is the clock input. For more information

on ICSP™ refer to the “PIC16F72x/PIC16LF72x

Programming Specification” (DS41332).

FIGURE 20-1:

TYPICAL CONNECTION FOR ICSP™ PROGRAMMING

Note:

The ICD 2 produces a VPP voltage greater

than the maximum VPP specification of the

PIC16F72X/PIC16LF72X.

When

using

this programmer, an external circuit, such

as the AC164112 MPLAB ICD 2 VPP volt-

age limiter, is required to keep the VPP

voltage within the device specifications.

VDD

VPP

GND

External

Device to be

Data

Clock

VDD

MCLR/VPP

VSS

ICSPDAT

ICSPCLK

To Normal Connections

* Isolation devices (as required).

10k

Programming

Signals

Programmed

VDD

PIC16F722-E/ML Datasheet(PDF) 195 Page - Microchip Technology

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