PIC16F726-I/SP 查看數據表（PDF） - Microchip Technology

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PIC16F726-I/SP

28/40/44-Pin Flash Microcontrollers with nanoWatt XLP Technology

Microchip Technology 

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 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 to the “PIC16F72x/PIC16LF72x

Programming Specification” (DS41332).

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.

FIGURE 20-1:

TYPICAL CONNECTION FOR ICSP™ PROGRAMMING

External

Programming

Signals

VDD

VPP

GND

Data

Clock

VDD

10k

Device to be

Programmed

VDD

MCLR/VPP

VSS

ICSPDAT

ICSPCLK

*

*

*

To Normal Connections

* Isolation devices (as required).

© 2009 Microchip Technology Inc.

DS41341E-page 195

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