what is the meaning of in circuit programming ?

Archiver

Hi group:

I have a question about the meaning of in-circuit programming. When
programming PIC 16F84, only
+5volt to Vdd, 13~14 volt to /MCLR , RB7 for data
RB6 for clock , My question is my target circuit has OSC1 ( 4Mhz for example) ,
Do I have to disable
or remove this crystal when programming? Does any one know where I can find
the in circuit
programmer and how does it work ? My intension is do not remove any component
of target when
programming ( for example download frommserial or printer port). After
programming, then programmer
is automatically isolate from the target circuit electrically and the target run
program
automatically . I am wandering how since it is connected between programmer and
target circuit.

Is it the in circuit programming mean ? I am wandering how programmer is
isolated from target .
Does the progrmmer it in high impedance state after download
the program ? Thank u for your help

Baker

Archiver

Baker,

The PIC16F84 can be programmed in-circuit by connecting RB6, RB7, GND and
MCLR/Vpp
to a capable programmer.

"In-circuit" means that you can program the PIC16F84 while it's in your
application
circuit
(without) removing it from the circuit.

Connections to the programmer must be broken after the programming sequence has
been
completed to isolate your PIC16F84 circuit from the programmers circuitry.

We have in-circuit programmers for the Microchip FLASH-Based PICs at:
http://www.rentron.com/PicBasic/ICSP.HTM that work with the PIC16F877,
PIC16F874, PIC16F876, PIC16F873 and PIC16F84.

Connection/Isolation, to/from the programmer are handled (automatically) using
an
onboard 4PDT
relay. Our in-circuit programmers are specifically designed to be used with the
EPIC
PIC programmer and make prototyping with the FLASH PIC microcontrollers quick &
easy
by eliminating the need to constantly remove the device from the
programmer/application
circuit.

Regards,

Bruce



| I have a question about the meaning of in-circuit programming. When
programming
PIC 16F84, only
| +5volt to Vdd, 13~14 volt to /MCLR , RB7 for data
| RB6 for clock , My question is my target circuit has OSC1 ( 4Mhz for example)
, Do
I have to disable
| or remove this crystal when programming?

| Does any one know where I can find the in circuit
| programmer and how does it work ? My intension is do not remove any component
of
target when
| programming ( for example download frommserial or printer port). After
programming,
then programmer
| is automatically isolate from the target circuit electrically and the target
run
program
| automatically . I am wandering how since it is connected between programmer
and
target circuit.
|
| Is it the in circuit programming mean ? I am wandering how programmer is
isolated
from target .
| Does the progrmmer it in high impedance state after download
| the program ? Thank u for your help
|
| Baker
|
|
|
|
|
|
|
|