and also the crystal has to be connected... right
Arun
lpc2368 isp circuit
Started by ●March 19, 2012
Reply by ●March 21, 20122012-03-21
Reply by ●March 21, 20122012-03-21
--- In l..., arun wrote:
>
> and also the crystal has to be connected... right
>
>
> Arun
>
>
>
And probably a lot of other stuff if you're talking about a bare chip. There are a lot of required pull-up and pull-down resistors around the JTAG lines. Something is also required around the MCLR' (or nReset or whatever it is called).
Use the schematic to find out what is required. They didn't put all those resistors and capacitors in just for fun. There will be decoupling capacitors at every power pin.
I don't know if the crystal is actually required. Read the User Manual and see if the ISP runs on an internal RC oscillator.
Richard
>
> and also the crystal has to be connected... right
>
>
> Arun
>
>
>
And probably a lot of other stuff if you're talking about a bare chip. There are a lot of required pull-up and pull-down resistors around the JTAG lines. Something is also required around the MCLR' (or nReset or whatever it is called).
Use the schematic to find out what is required. They didn't put all those resistors and capacitors in just for fun. There will be decoupling capacitors at every power pin.
I don't know if the crystal is actually required. Read the User Manual and see if the ISP runs on an internal RC oscillator.
Richard
Reply by ●March 21, 20122012-03-21
making a pcb for a bare chip is my plan.... what else is possible??
are the resistors around jtag required if im not going to use jtag?
...
the max circuit, circuit to power up the controller, pull up resistors, capacitors and crystal.....
anything else that is essential?
Arun
are the resistors around jtag required if im not going to use jtag?
...
the max circuit, circuit to power up the controller, pull up resistors, capacitors and crystal.....
anything else that is essential?
Arun
Reply by ●March 21, 20122012-03-21
Hello Arun,
If you're planning to make a pcb on your own you should take a look at the
uController user manual and datasheet, you'll find there the resistors
you'll need, capacitors and crystal. Take a look at other pcb schematics
(from Olimex, from Keil and others) and understand what others have done
and what for, if you don't know what a specific IC is for just get its
datasheet and read it, you'll find out what a lot of resistors and
capacitors are for. After that, when you're able to look at a pcb and know
with one quick glance which components are the ones for ISP and which are
for clock and power then do your own pcb. The first one won't work, try and
do another one and with luck your second may.
I'm sorry to tell you this but you won't be able to do a pcb if you need to
ask what resistors you need and where to place them. There is plenty of
information on that you just need to read it. Many of us did several pcbs
for several different uControllers but I can assure you that none just
asked which components were needed for the pcb and where to place them.
Study first, learn, and then just do it. If you need help on something
specific ask it, we'll be glad to help you, but a question like 'how can I
make a whole pcb?' without knowing which resistors are needed and crystal
and decoupling capacitors is a wrong question and you won't get an answer
that will make you capable of drawing a pcb.
The answer to the question about JTAG you asked is in the LPC manual, if
you're planning to make a pcb you should have already taken a look at it
and not need to ask the question.
Rebards,
Bernardo.
On Wed, Mar 21, 2012 at 12:53 PM, arun wrote:
> **
> making a pcb for a bare chip is my plan.... what else is possible??
>
> are the resistors around jtag required if im not going to use jtag?
>
> ...
>
> the max circuit, circuit to power up the controller, pull up resistors,
> capacitors and crystal.....
>
> anything else that is essential?
> Arun
>
>
>
>
>
If you're planning to make a pcb on your own you should take a look at the
uController user manual and datasheet, you'll find there the resistors
you'll need, capacitors and crystal. Take a look at other pcb schematics
(from Olimex, from Keil and others) and understand what others have done
and what for, if you don't know what a specific IC is for just get its
datasheet and read it, you'll find out what a lot of resistors and
capacitors are for. After that, when you're able to look at a pcb and know
with one quick glance which components are the ones for ISP and which are
for clock and power then do your own pcb. The first one won't work, try and
do another one and with luck your second may.
I'm sorry to tell you this but you won't be able to do a pcb if you need to
ask what resistors you need and where to place them. There is plenty of
information on that you just need to read it. Many of us did several pcbs
for several different uControllers but I can assure you that none just
asked which components were needed for the pcb and where to place them.
Study first, learn, and then just do it. If you need help on something
specific ask it, we'll be glad to help you, but a question like 'how can I
make a whole pcb?' without knowing which resistors are needed and crystal
and decoupling capacitors is a wrong question and you won't get an answer
that will make you capable of drawing a pcb.
The answer to the question about JTAG you asked is in the LPC manual, if
you're planning to make a pcb you should have already taken a look at it
and not need to ask the question.
Rebards,
Bernardo.
On Wed, Mar 21, 2012 at 12:53 PM, arun wrote:
> **
> making a pcb for a bare chip is my plan.... what else is possible??
>
> are the resistors around jtag required if im not going to use jtag?
>
> ...
>
> the max circuit, circuit to power up the controller, pull up resistors,
> capacitors and crystal.....
>
> anything else that is essential?
> Arun
>
>
>
>
>
Reply by ●June 27, 20122012-06-27
Hi All:
I was developing some software for STM32F0 Cortex-M0 on STM32F0DISCOVERY kit which came with Keil IDE. It was running well with other software I developed, yet with new software it kept on posting the error "No Target Connected". I reinstalled the ST-Link driver again
but still gave the same error. I am at a loss.
I wonder if you could shed some light what is causing it.
Thanks
Best Wishes!
Noman
________________________________
From: rtstofer
To: l...
Sent: Wednesday, March 21, 2012 1:23:01 AM
Subject: [lpc2000] Re: lpc2368 isp circuit
--- In l..., arun wrote:
>
> and also the crystal has to be connected... right
>
>
> Arun
>
>
>
And probably a lot of other stuff if you're talking about a bare chip. There are a lot of required pull-up and pull-down resistors around the JTAG lines. Something is also required around the MCLR' (or nReset or whatever it is called).
Use the schematic to find out what is required. They didn't put all those resistors and capacitors in just for fun. There will be decoupling capacitors at every power pin.
I don't know if the crystal is actually required. Read the User Manual and see if the ISP runs on an internal RC oscillator.
Richard
I was developing some software for STM32F0 Cortex-M0 on STM32F0DISCOVERY kit which came with Keil IDE. It was running well with other software I developed, yet with new software it kept on posting the error "No Target Connected". I reinstalled the ST-Link driver again
but still gave the same error. I am at a loss.
I wonder if you could shed some light what is causing it.
Thanks
Best Wishes!
Noman
________________________________
From: rtstofer
To: l...
Sent: Wednesday, March 21, 2012 1:23:01 AM
Subject: [lpc2000] Re: lpc2368 isp circuit
--- In l..., arun wrote:
>
> and also the crystal has to be connected... right
>
>
> Arun
>
>
>
And probably a lot of other stuff if you're talking about a bare chip. There are a lot of required pull-up and pull-down resistors around the JTAG lines. Something is also required around the MCLR' (or nReset or whatever it is called).
Use the schematic to find out what is required. They didn't put all those resistors and capacitors in just for fun. There will be decoupling capacitors at every power pin.
I don't know if the crystal is actually required. Read the User Manual and see if the ISP runs on an internal RC oscillator.
Richard
Reply by ●June 27, 20122012-06-27
