Цитата(Cosmojam @ Oct 25 2013, 15:37)

Подскажите в чём может быть проблема?
А каая температура ?!
4.1 IRC.1: Accuracy of the Internal RC oscillator (IRC) frequency may be
outside of the 4 MHz +/ 1 % specification only at extreme
temperatures
Introduction:
The device has a 4 MHz internal RC oscillator (IRC) which can be optionally used as the
clock source for the Watch Dog Timer (WDT), and/or as the clock that drives the PLL and
subsequently the CPU. The IRC frequency spec is 4 MHz +/ 1 % accuracy over the
entire voltage and temperature range. During In-System Programming (ISP), the
auto-baud routine is expecting the IRC frequency to be 4 MHz +/ 1 % and is used to
synchronize with the host via serial port 0.
Problem:
On the LPC2478 Rev D device (only with date codes 0949 and before), the accuracy of
internal RC oscillator (IRC) frequency does not meet the 4 MHz +/ 1 % specification for
temperatures between 20 C and 40 C and the accuracy of internal RC oscillator (IRC)
frequency is 4 MHz +/ 5 % instead. As a result, only at these temperatures, this may
affect the auto-baud routine's ability to synchronize with the host via serial port 0 during
In-System Programming (ISP) at higher baud rates. For temperatures above 20 C, the
accuracy of internal RC oscillator (IRC) frequency meets the 4 MHz +/ 1 % specification.
Work-around:
None
ERRATA
Марс - единственная планета, полностью населенная роботами (около 7 штук).