PIC16F1828T-I/SL Просмотр технического описания (PDF) - Microchip Technology

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PIC16F1828T-I/SL

28/40/44-Pin, Low-Power, High-Performance Microcontrollers with nanoWatt XLP Technology

Microchip Technology 

PIC16(L)F1824/1828

28.0 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).

28.1 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 28-1 for example circuit.

FIGURE 28-1:

VPP LIMITER EXAMPLE CIRCUIT

VPP

VDD

VSS

ICSP_DATA

ICSP_CLOCK

NC

1

2

3

4

5

6

RJ11-6PIN

To MPLAB® ICD 2

R1

270 Ohm

LM431BCMX

2

3

6

7

A

A

A

A

U1 K 1

NC

NC

4

5

VREF

8

R2

R3

10k 1% 24k 1%

RJ11-6PIN

6

5

4

3

2

1

To Target Board

Note:

The MPLAB ICD 2 produces a VPP volt-

age greater than the maximum VPP spec-

ification of the PIC16F/LF1824/1828.

 2010 Microchip Technology Inc.

Preliminary

DS41419B-page 333

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