Hi Manca I have been trying Power Modes on LPC11A14 after you advised. I am using IRC as PLL input (ie 12MHz). According to UM the PLL divider can have a max....
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Olivier Gautherot
ogautherot
May 9, 2013 3:04 pm
Dear Shashank, what do you mean when you say that it hangs? If you monitor the activity through a JTAG link, the debug interface is very likely to hang because...
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M. Manca
micronpn
May 9, 2013 3:34 pm
... 1. The debug mode is not supported in low power modes and I don't know what could happen with it enabled. 2. In sleep mode the MCU clk is stopped. 3. If...
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Shashank Maheshwari
shashankiim
May 9, 2013 3:43 pm
Thanks for the replies. Have a look at this code : command[0] = 48; //system freq 48 MHz command[1] =...
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Michael Anton
mike_antonca
May 9, 2013 10:35 pm
Perhaps you are getting some response other than PLL_CMD_SUCCESS from your set_pll call. This would result in the LED staying on. Mike ... From:...
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Shashank Maheshwari
shashankiim
May 10, 2013 3:19 am
ok I tried all the result options of set_pll. I set one LED for each of the five options however none of the LED glows. ie the system halts at set_pll command....
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Daniel Widyanto
daniel.widyanto
May 10, 2013 4:45 am
The LPC11Axx PLL is designed to multiplies the input frequency, NOT DIVIDING IT. You cannot convert core speed 12Mhz to 50kHz. Use the divider in your...
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Michael Anton
mike_antonca
May 10, 2013 4:50 am
Actually, the user manual indicates that it can output lower frequencies than the oscillator. Mike ... From: lpc2000@yahoogroups.com...
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Daniel Widyanto
daniel.widyanto
May 10, 2013 4:58 am
Which part of User Manual ? The PLL only operates in single mode: Fclkout = M x Fclkin (M=1..32). So there's no way the PLL output will be less than input...
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Michael Anton
mike_antonca
May 10, 2013 5:38 am
I see your point, but take a look at page 284 where they show an example of creating a 40kHz clock, and explain why it is not possible. But using their ...
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Shashank Maheshwari
shashankiim
May 10, 2013 5:42 am
How about System clock divider register (SYSAHBCLKDIV) ? The UM says : This register controls how the main clock is divided to provide the system clock to the...
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Shashank Maheshwari
shashankiim
May 10, 2013 5:44 am
@Michael... Yes thats what has been bothering me. According to that set_pll must work. However the system hangs ! On Fri, May 10, 2013 at 11:12 AM, Shashank...
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M. Manca
micronpn
May 10, 2013 6:47 am
... Technically there is no reason to use the PLL if you need a FCLK less then the crystal or IRC frequency, it is better to power down the PLL. Then, to...
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Shashank Maheshwari
shashankiim
May 10, 2013 7:10 am
According to the convention, a low frequency should reduce the power consumption. However when I use LF Oscillator at its lowest frequency and shut down the...
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M. Manca
micronpn
May 10, 2013 7:26 am
... There are many things that you aren't considering or you are doing wrong because at 12MHz with PLL and SYSOSC disabled in power down you should have a...
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Shashank Maheshwari
shashankiim
May 10, 2013 8:20 am
Thanks for that input Manca. This group is a real saver! So I was just trying out all the alternatives and following is the result : Before going into sleep...
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M. Manca
micronpn
May 10, 2013 8:42 am
... yes it should. I think you could turn down everything except flash, ram and something to awake the microcontroller. ... Not so much. I have no data to say...
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Bernardo Marques
thisaliasisi...
May 10, 2013 1:33 pm
Isn't it possible to place the code that enters sleep mode in RAM, interrupt vectors in RAM, interrupt routines in RAM and disable flash power? When you wake...
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Shashank Maheshwari
shashankiim
May 10, 2013 5:59 pm
Hey So finally after setting up the GPIO pins right, turning off the peripherals as explained in the earlier threads (including flash), turning on the LFO...
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M. Manca
micronpn
May 10, 2013 7:05 pm
... Technically having an EEPROM you should design your application to switch totally off the microcontroller. ... [Non-text portions of this message have been...
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Donald H
donhamilton2002
May 11, 2013 9:21 pm
... This is a Sheldon Cooper moment !! "Of course something has changed, but I don't get anything wrong." Do you have a working board that you can change to a...
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Mahesh Kumar
mbededkumar
May 14, 2013 7:34 am
GSM SIM300 modules 500 nos in stock with me contact if any body can lift the stock with me. ... From: Vladimir Ljaschko <vl@...> Subject: Re: RE:RE: Re:...
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dherity
May 14, 2013 5:58 pm
The LPC2458 Data Sheet gives a typical value of 11ns SPI_MISO setup time in Table 10 on page 52, but not a minimum. Does anyone know the minimum setup time? ...
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Paul Curtis
paul_l_curtis
May 14, 2013 6:13 pm
... Ask NXP? ... Perhaps NXP haven't characterised it for the LPC2458? -- Paul Curtis, Rowley Associates Ltd http://www.rowley.co.uk SolderCore Development...
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Leon
leon_heller
May 14, 2013 7:27 pm
... It's probably the same as other similar LPC2000 devices. They are likely to use similar peripheral hardware. Leon...
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firmware111
May 16, 2013 10:09 am
Hi Guys, We have a product that uses the real time clock of the lpc1788. When the RTC is enabled it normally starts counting seconds then minutes, hours and so...
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Tim Mitchell
congoblue10
May 16, 2013 10:15 am
... From: lpc2000@yahoogroups.com [mailto:lpc2000@yahoogroups.com] On Behalf Of firmware111 Sent: 16 May 2013 11:10 To: lpc2000@yahoogroups.com Subject:...
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firmware111
May 16, 2013 10:33 am
We just found it... btw It seems that the internal test mode controls are not reset to 0. Keep in mind that those bits are not touched by the firmware and thus...
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lawzaz
May 16, 2013 3:43 pm
I have appnote 11008 open right now and this seems like overkill for what I want (and I'm confused as to how I would extend for char arrays). I have a board...
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rtstofer
May 17, 2013 2:41 am
... You just need to think about it a little more. The AN is trying to create a new copy in a separate area before it erases the previous area. The size of...
