Datasheet

 2010-2012 Microchip Technology Inc. DS41417B-page 183
PIC16(L)F722A/723A
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).
FIGURE 20-1: TYPICAL CONNECTION FOR ICSP™ PROGRAMMING
Note: The ICD 2 produces a VPP voltage greater
than the maximum V
PP specification of the
PIC16(L)F722A/723A. When using this
programmer, an external circuit, such as
the AC164112 MPLAB ICD 2 V
PP voltage
limiter, is required to keep the V
PP 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