Hi,
In which cases do we need to use pull up or pull down resisters?
I need to interface some gates and buffers to the gpio pins of LPC2148
as dead time generator circuit.
1.Is there any dead time register available in LPC2148's PWM module as
in case of some Texas instrument's DSPs or will I have to use timers
and capture interrupts?
2.how would I know if the logic family I am using is compatible with
LPC2148 or not e.g. say 74ls00 or 74hc00 or 74hc132?
3.can you suggest some technical documents which can help me in this
regards.
4.what may happen if I interface an IC which is not compatible to
output levels of LPC2148?
Compatibility of LPC2148
Started by ●February 13, 2009
Reply by ●February 14, 20092009-02-14
On Saturday 14 February 2009 03:48, chintanjoshi2008 wrote:
> Hi,
> In which cases do we need to use pull up or pull down resisters?
Err.. i think you are in the wrong end of the pool. But...
Pullup when you want a high and pull down when you want a low.
> I need to interface some gates and buffers to the gpio pins of
> LPC2148 as dead time generator circuit.
> 1.Is there any dead time register available in LPC2148's PWM module
> as in case of some Texas instrument's DSPs or will I have to use
> timers and capture interrupts?
> 2.how would I know if the logic family I am using is compatible
> with LPC2148 or not e.g. say 74ls00 or 74hc00 or 74hc132?
I am sure you are in the deep end of the pool without knowing anything
about swimming.
> 3.can you suggest some technical documents which can help me in
> this regards.
The LPC2148 hardware manual AND the ttl device manuals.
> 4.what may happen if I interface an IC which is not compatible to
> output levels of LPC2148?
It depends. Sometimes they die quietly some times with a wisp of
smelly smoke. sometimes with a nice entertaining bang. On the rare
occasion it might be really entertaining - ignites a nice bonfire and
require evacuation of the building.
You need to read up on basic digital logic gates, fan-in, fanout, gate
delays, tristate, . Google is the perfect place to start.
--
Rgds
JTD
> Hi,
> In which cases do we need to use pull up or pull down resisters?
Err.. i think you are in the wrong end of the pool. But...
Pullup when you want a high and pull down when you want a low.
> I need to interface some gates and buffers to the gpio pins of
> LPC2148 as dead time generator circuit.
> 1.Is there any dead time register available in LPC2148's PWM module
> as in case of some Texas instrument's DSPs or will I have to use
> timers and capture interrupts?
> 2.how would I know if the logic family I am using is compatible
> with LPC2148 or not e.g. say 74ls00 or 74hc00 or 74hc132?
I am sure you are in the deep end of the pool without knowing anything
about swimming.
> 3.can you suggest some technical documents which can help me in
> this regards.
The LPC2148 hardware manual AND the ttl device manuals.
> 4.what may happen if I interface an IC which is not compatible to
> output levels of LPC2148?
It depends. Sometimes they die quietly some times with a wisp of
smelly smoke. sometimes with a nice entertaining bang. On the rare
occasion it might be really entertaining - ignites a nice bonfire and
require evacuation of the building.
You need to read up on basic digital logic gates, fan-in, fanout, gate
delays, tristate, . Google is the perfect place to start.
--
Rgds
JTD
