PIC16F818-ESLASHML datasheet(103/176 Pages) MICROCHIP

103 / 176 page

 2004 Microchip Technology Inc.

DS39598E-page 101

PIC16F818/819

12.17 In-Circuit Serial Programming

PIC16F818/819

microcontrollers

can

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 (see Figure 12-10 for an example). 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

custom

firmware

programmed.

For more information on serial programming, please refer

to the “PIC16F818/819 Flash Memory Programming

Specification” (DS39603).

FIGURE 12-10:

TYPICAL IN-CIRCUIT

SERIAL PROGRAMMING

CONNECTION

Note:

The Timer1 oscillator shares the T1OSI

and T1OSO pins with the PGD and PGC

pins

used

for

programming

and

debugging.

When using the Timer1 oscillator, In-Circuit

Serial Programming™ (ICSP™) may not

function correctly (high voltage or low

voltage) or the In-Circuit Debugger (ICD)

may not communicate with the controller.

As a result of using either ICSP or ICD, the

Timer1 crystal may be damaged.

If ICSP or ICD operations are required, the

crystal should be disconnected from the

circuit (disconnect either lead) or installed

after programming. The oscillator loading

capacitors may remain in-circuit during

ICSP or ICD operation.

External

Connector

Signals

To Normal

Connections

To Normal

Connections

PIC16F818/819

VDD

VSS

MCLR/VPP

RB6

RB7

+5V

VPP

CLK

Data I/O

VDD

* Isolation devices (as required).

† RB3 only used in LVP mode.

RB3†

RB3/PGM

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