參數(shù)資料
型號(hào)： DRM042
英文描述： Universal Serial Bus Wireless Optical Mouse and Multimedia Keyboard reference design designer reference manual
中文描述： 通用串行總線(xiàn)無(wú)線(xiàn)光學(xué)鼠標(biāo)和多媒體鍵盤(pán)參考設(shè)計(jì)，設(shè)計(jì)參考手冊(cè)
文件頁(yè)數(shù)： 30/80頁(yè)
文件大?。?/td> 1025K
代理商： DRM042
Software
Designer Reference Manual
DRM040 — Rev 0
30
Software
MOTOROLA
3.1.3 Timer2 ISR
The Tim2_ISR service routine services the periodic interrupt generated
by Timer2 overflow. A Timer2 overflow occurs every 2500 bus clock
cycles which is equal to 1600 Hertz. This rate assures that 32 samples
of voltage and current are taken for each complete period of the 50 Hertz
sinewave power signal. A programmable delay between acquisition of
line voltage and line currents compensates for the unequal phase shifts
introduced by the voltage and current transformers. Each A/D
conversion is stored in its associated memory locations. Additionally line
voltage and current samples are subtracted from the “baseline” (one-half
fullscale value) to obtain unshifted signed waveform samples. The
current samples are squared and accumulated to form the mean
squared value used for current range switching. The memory location
“samplecount” is decremented by one during each pass through the
interrupt service routine. When “samplecount” has been decremented
from 256 to zero, eight complete sinewave cycles have been sampled,
converted and added up to form the total real power contained in eight
cycles. This sum of powers (instantaneous power) is prepared for
scaling by the calibration coefficient using the signed 48-bit division
routine “SDiv48”. The actual division is performed in the main loop.
Finally, the accumulated mean square current value is compared
against a high-limit “hilimit” and low-limit “l(fā)olimit” value in the “attenflag”
register to determine the range setting. Tim2_ISR is shown in
Figure 3-3
.
F
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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