MCP25020ESLASHP datasheet(50/66 Pages) MICROCHIP

50 / 66 page

MCP2502X/5X

DS21664D-page 50

8.7

In-Circuit Serial Programming

The MCP2502X/5X can be serially programmed while

in the end application circuit. This is simply done with

two lines for clock and data, and three other lines for

power, ground and the programming voltage. This

allows

customers

manufacture

boards

with

unprogrammed devices and then program the device

just before shipping the product, also allowing the

most recent firmware (or a custom firmware) to be

programmed.

The device is placed into a program/verify mode by

holding the GP4 and GP5 pins low while raising GP7

(VPP) pin from VIL to VIH (see the MCP2502X/5X

programming

specification,

“MCP250XX

In-Circuit

Serial Programming™ (ICSP)”, DS20072, for more

information). GP4 becomes the programming data and

GP5 becomes the programming clock. Both GP4 and

GP5 are Schmitt Trigger inputs in this mode. The signal

definitions are summarized in Table 8-1

TABLE 8-1:

IN-CIRCUIT SERIAL

PROGRAMMING PIN

FUNCTIONS

Pin Name

Number

Programming Mode

Function

VSS

Ground

GP4

Data

GP5

Clock

GP7

VPP

VDD

Power

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