PIC12F1822-ISLASHMF datasheet(315/398 Pages) MICROCHIP

315 / 398 page

 2010 Microchip Technology Inc.

Preliminary

DS41413A-page 315

PIC12F/LF1822/16F/LF1823

27.0 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

In Program/Verify mode the program memory, user IDs

and the Configuration Words are programmed through

serial communications. The ICSPDAT pin is a bidirec-

tional I/O used for transferring the serial data and the

ICSPCLK pin is the clock input. For more information on

ICSP™ refer to the “PIC16F/LF182X/PIC12F/LF1822

Memory Programming Specification” (DS41403).

27.1

High-Voltage Programming Entry

Mode

The device is placed into High-Voltage Programming

Entry mode by holding the ICSPCLK and ICSPDAT

pins low then raising the voltage on MCLR/VPP to VIHH.

Some programmers produce VPP greater than VIHH

(9.0V), an external circuit is required to limit the VPP

voltage. See Figure 27-1 for example circuit.

FIGURE 27-1:

VPP LIMITER EXAMPLE CIRCUIT

VREF

VPP

VDD

VSS

ICSP_DATA

ICSP_CLOCK

RJ11-6PIN

270 Ohm

To MPLAB® ICD 2

To Target Board

10k 1%

24k 1%

LM431BCMX

Note:

The ICD 2 produces a VPP voltage greater

than the maximum VPP specification of the

PIC12F/LF1822/16F/LF1823.

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