abstract.txt

lpc单片机内部看门狗计时器程序

LPC932 EXAMPLE:    AUTOCALIBRATION OF INTERNAL LOW POWER OSCILLATOR FOR    
                                   CLOCKING THE UART
Christian Kulig, 12/06/02


INTRODUCTION:
The LPC932 provides a number of features, which help to reduce power 
consumption as well as to minimize external components.

For example, it might be an option for applications in battery powered and 
handheld devices to clock the 礐 with the internal watchdog timer (WDT). 
(See figure 1) This lowers the power consumption considerably compared to 
the use of an external crystal or the internal RC oscillator. And of 
course, there's no need for the crystal and its two capacitors anymore. 
Thus, applications, which don't need a high clock frequency, can be 
developed more economically.


APPLICATION TO THE UART:
Nevertheless, it's possible to achieve a highly accurate time base if 
required. For example to drive the integrated UART, it's necessary to set 
up a baud rate with a deviation smaller than