OPTION_REG datasheet(189/222 Pages) MICROCHIP

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DS22331A-page 189

MCP19111

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

•VDD

•VSS

In Program/Verify mode the Program Memory, User IDs

and the Configuration Words are programmed through

serial

communications.

The

ICSPDAT

bidirectional I/O used for transferring the serial data and

the ICSPCLK pin is the clock input. The device is placed

into a Program/Verify mode by holding the ICSPDAT and

ICSPCLK pins low, while raising the MCLR pin from VIL to

VIHH.

28.1

Common Programming Interfaces

Connection to a target device is typically done through

an ICSP header. A commonly found connector on

development tools is the RJ-11 in the 6P6C (6 pin,

6 connector) configuration. See Figure 28-1.

FIGURE 28-1:

ICD RJ-11 STYLE

CONNECTOR INTERFACE

Another connector often found in use with the PICkit™

programmers is a standard 6-pin header with 0.1 inch

spacing. Refer to Figure 28-2.

FIGURE 28-2:

PICkit-STYLE CONNECTOR INTERFACE

Target

Bottom Side

PC Board

MCLR

VSS

ICSPCLK

VDD

ICSPDAT

Pin Description

1 = MCLR

2 = VDDTarget

3 = VSS (ground)

4 = ICSPDAT

5 = ICSPCLK

6 = No Connect

The 6-pin header (0.100" spacing) accepts 0.025" square pins.

Pin Description*

1 = MCLR

2 = VDDTarget

3 = VSS (ground)

4 = ICSPDAT

5 = ICSPCLK

6 = No Connect

Pin 1 Indicator

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