Lpc2000

Mark,

put your finger on top of the chip, as long as this does not feel
uncomfortably warm there should be no damage or shortened life cycle. 
To have a lottle headromm, you want to overclock the CPU a lot more
than you did and try to find out when it fails. Then go backwards from
there. 
Tests we did showed flakiness when MAMTIM was set to 3 and running the
core at approx. 100 MHz!
With MAMTIM set to 4 even 100 MHz at room temp seemed stable. Te
devices got warm but not hot. Keep in mind that external temps of 85C
could change the picture a little bit.
IMHO, 
the LPC213x runs easily at 80 MHz with your calculated access time
between 35 and 40ns seems very save.

Bob

--- In lpc2000@yahoogroups.com, "mark_dell555" <mark_dell555@y...> wrote:
>
> Hi, I needed a bit more speed in my app, and I suppose i could of
> tried to optimize it a bit, but I was feeling kinda lazy.  So I
> decided to overclock my lpc2134.  I'm using a 14.745Mhz XTAL, normally
> i was running at 59.0 Mhz with a flash access time of 51ns.  First I
> went to 73.7 Mhz (xtal*5) and 54ns flash access time.  Everything
> seemed stable and my app ran about 8.1% faster, my current draw went
> to 65mA.  Then I decided to up the flash access time (73.7 / 3 ~
> 24.5mhz) to 41ns.  With this config my app ran 23% faster, and the
> current draw rised to 67mA.  The current draw at 59Mhz is 56.5mA. 
> I've summerized my results in the table below:
> 
> +--------+---------+--------------+--------------+---------+---------+
> | PLL_M  |  MAM_T  | SYSTEM CLOCK | FLASH ACCESS | CURRENT |  SPEED  |
> +--------+---------+--------------+--------------+---------+---------+
> |   4    |    3    |   59.0 Mhz   |    51 ns     | 56.5 mA |  100 %  |
> |   4    |    2    |   59.0 Mhz   |    34 ns     | 59.0 mA |  116 %  |
> |   5    |    4    |   73.7 Mhz   |    54 ns     | 65.0 mA |  108 %  |
> |   5    |    3    |   73.7 Mhz   |    41 ns     | 67.3 mA |  123 %  |
> +--------+---------+--------------+--------------+---------+---------+
> Note:  My application blinks an LED that draws about 3 mA.  
> 
> Has anyone else experimented with overclocking the LPC21xx series?
> Do you think overclocking this chip significantly reduces its lifetime?
> 
> Cheers,
> Mark
>