PIC12F752 datasheet(154/204 Pages) MICROCHIP

154 / 204 page

PIC12F752/HV752

DS41576A-page 154

Preliminary

 2011 Microchip Technology Inc.

17.10 In-Circuit Serial Programming™

ThePIC12F752/HV752 microcontrollers can be serially

programmed while in the end application circuit. This is

simply done with five connections for:

•clock

•data

• power

• ground

• programming voltage

This allows customers to manufacture boards with

unprogrammed

devices

and

then

program

the

microcontroller just before shipping the product. This

also allows the most recent firmware or a custom

firmware to be programmed.

The device is placed into a Program/Verify mode by

holding the ICSPDAT and ICSPCLK pins low, while

raising the MCLR (VPP) pin from VIL to VIHH. See the

Memory Programming Specification (DS41561) for

more information. ICSPDAT becomes the programming

data and ICSPCLK becomes the programming clock.

Both ICSPDAT and ICSPCLK are Schmitt Trigger

inputs in Program/Verify mode.

A typical In-Circuit Serial Programming connection is

shown in Figure 17-11.

FIGURE 17-11:

TYPICAL IN-CIRCUIT

SERIAL PROGRAMMING

CONNECTION

Note:

To erase the device, VDD must be above

the Bulk Erase VDD minimum given in the

“Program

Memory

Specification”

(DS41561)

External

Connector

Signals

To Normal

Connections

To Normal

Connections

PIC12F752/HV752

VDD

VSS

MCLR/VPP

ICSPCLK

ICSPDAT

+5V

VPP

CLK

Data I/O

* Isolation devices (as required)

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