Lpc2000

Phillips_apps,

I'm planning to update the bootloader on the lpc2114 chip that's 
running on a 14.7456 MHz Xtal. I only see frequency numbers provided 
for 10 MHz & 12 MHz that's supposed to go in Ram Buffer location 
0x40000200.

What's the safest value to put for 14.7456 MHz? 

Leighton

--- In lpc2000@yahoogroups.com, "philips_apps" <philips_apps@y...> 
wrote:
> Hello Leighton,
> 
> The version of the bootloaders that do not have the improved timing
> behavior is different for the LPC210x  and all other LPC2000 family
> members in the 64-pin or 144-pin package. 
> 
> For devices in the 64-pin package like yours, the updated version
> should be V1.63 or later. So, the bootloader you have could show 
the
> problem, however, as mentioned in the Errata Sheet it affects up to
> 10% of the devices ot in other words, 90%+ of the devices will 
never
> show this problem. 
> 
> The most critical event is an IAP call while running the device 
with
> max speed at hot temperature (could be 10% failure rate). The least
> critical running it at 10-12 MHz room temp (you will probably never
> see the issue). 
> 
> Look at this Errata like a patch from some big company for their
> Exploration software. In all likelyhood the devices that did not 
show
> the problems in a given enviroment will continue to work fine in 
the
> same enviroment. A change in enviroment, speed, temperature... 
could
> however trigger the misbehavior. So, if you have the opportunity to
> upgrade your bootloader version it is a good idea to do so, if not 
and
> your environment does not change, no sweat.
> 
> Hope this helps to clarify the issue. 
> 
> Best regards, Robert