PIC16F753 datasheet(167/230 Pages) MICROCHIP

167 / 230 page

 2013-2015 Microchip Technology Inc.

DS40001709C-page 167

PIC16F753/HV753

19.10 In-Circuit Serial Programming™

The

PIC16F753/HV753

microcontrollers

can

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

“PIC16F753/HV753

Flash

Memory

Programming

Specification”

(DS41686)

for

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 19-11.

FIGURE 19-11:

TYPICAL IN-CIRCUIT

SERIAL PROGRAMMING

CONNECTION

Note:

To erase the device, VDD must be above

the Bulk Erase VDD minimum given in the

“PIC16F753/HV753

Flash

Memory

Programming Specification” (DS41686).

External

Connector

Signals

To Normal

Connections

To Normal

Connections

PIC16F753/HV753

VDD

VSS

MCLR/VPP

ICSPCLK

ICSPDAT

+5V

VPP

CLK

Data I/O

* Isolation devices (as required)

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