PIC16F72X/PIC16LF72X
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
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:
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).
• ICSPCLK
• ICSPDAT
• MCLR/VPP
• VDD
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.
• VSS
FIGURE 20-1:
TYPICAL CONNECTION FOR ICSP™ PROGRAMMING
External
Programming
Signals
Device to be
Programmed
VDD
VDD
VDD
10k
VPP
MCLR/VPP
VSS
GND
Data
ICSPDAT
ICSPCLK
Clock
*
*
*
To Normal Connections
Isolation devices (as required).
*
© 2009 Microchip Technology Inc.
DS41341E-page 195
MICROCHIP [ MICROCHIP ]
