PIC16F720-ESLASHML datasheet(171/244 Pages) MICROCHIP

171 / 244 page

 2010 Microchip Technology Inc.

DS41430A-page 171

PIC16F/LF720/721

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 pin is a bidirectional I/O

used for transferring the serial data and the ISCPCLK pin

is the clock input. For more information on ICSP™ refer

the

“PIC16F72x/PIC16LF72x

Programming

Specification” (DS41332).

FIGURE 20-1:

TYPICAL CONNECTION FOR ICSP™ PROGRAMMING

Note:

The MPLAB® ICD 2 produces a VPP volt-

age greater than the maximum VPP spec-

ification of the PIC16F/LF720/721. When

using this programmer, an external circuit,

such as the AC164112 MPLAB ICD 2 VPP

voltage 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

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