Lpc2000

The web page also have the user manual available. You would probably find 
most of the answers to your questions.

Kerem


----- Original Message ----- 
From: "Lasse Madsen" <lasse.madsen@...>
To: <lpc2000@yahoogroups.com>
Sent: Friday, September 17, 2004 3:13 PM
Subject: [lpc2000] LPC2114 - basic questions


> Hi all
>
> I have some basic questions concerning the LPC2114:
>
> 1.
> If I want to be able to JTAG debug my code RTCK has to be used as a
> dedicated JTAG enable/disable during boot pin right?
>
> 2.
> Assuming the above is correct... I pull RTCK low during reset and all
> JTAG pins are forced into JTAG mode (TDI, TDO, RTCK, TRST, TMS, and TCK)
> is there a way to use these pins as either inputs or outputs while still
> having JTAG capability? Could I for instance connect LED's to some
> (all?) of these pins and then when I'm finished with JTAG debugging I
> can control LED's as "usual"?
>
> 3.
> I'm planning to use the TRACESYNC pin as an output driving a multiplexer
> select line and from what I'm reading in the datasheet (Internal
> pull-up) there's no need for me to connect a pull up on this pin to
> avoid the "mystical debug interface" to be triggered during reset. Is
> this correct?
>
> 4.
> I want to connect an SD card to SPI0 so the SPI0 interface has to
> operate in master mode is it correct that one has to connect SSEL0 to
> +3V in order to force MASTER mode and then use a regular output pin as
> the chip select on the SD card ?
>
> 5.
> I also would like to connect an Atmel data flash to SPI1 I assume I also
> have to connect SSEL1 to +3V to force master?
>
> 6.
> I would like to use the full modem port on UART1 but not wanting to use
> an additional multiplexer in my design I have connected P0.14 to a
> switch with a pull up resistor so I can take the pin low during reset.
> My DCD output from the modem is connected to P0.16 (EINT-0) so I should
> be able to have an interrupt when the DCD toggles but is the EINT pins
> active high or low (or even better can this be specified in software?)
>
> 7. As I understand it nearly all pins have 5V tolerance due to an
> internal diode to VCC... I have a resistor divider where I have an input
> range of 10 to 20V into a 120K resistor and a 22K to ground if how ever
> the input voltage should rise above 20V to for instance 30V my resistor
> divider would output 4.6V shouldn't the internal diode protect the ADC
> from burning up in flames :) ?
>
> As I see it the internal diode would consume
> ((4,6V-(VCC+Vdforward))/120K).
> Unfortunately I do not have the full datasheet so I don't know the
> Vdforward so I'm assuming a shottky with 200mV into the following
> formula:
> Ipin = ((4,6V-(3V+200mV))/120K) = approx 12uA which doesn't sound like
> enough to make flames if there is an internal diode in the chip!?
>
> 8.
> Does any one have the full datasheet the only thing I was able to find
> was a 33 page datasheet on the webpage?
>
> Thanks for reading and sharing your comments!
>
> Best regards
> Lasse Madsen
>
>
>
>
>
> Yahoo! Groups Links
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>