參數(shù)資料
型號： DRM040
英文描述： Single Phase Digital Power Meter Reference Design
中文描述： 單相電能表的數(shù)字參考設計
文件頁數(shù)： 35/80頁
文件大?。?/td> 1025K
代理商： DRM040
Software
Software Routines
DRM040 — Rev 0
Designer Reference Manual
MOTOROLA
Software
35
3.1.5 Meansq
This Subroutine is used to calculate the mean squared current. The
measured current is copied and multiplied with itself using the “smpy16”
routine. The squared current value is then added to the previous squares
to build up a mean value composed of 256 samples.
Figure 3-6
shows
meansq flow diagram.
Figure 3-6. meansq
3.1.6 Add2tar
Subroutine “add2tar” adds the scaled instantaneous power to the active
tariff buffer and checks whether the value in the active tariff buffer
(48-bit) fits into the 8-digit LCD display. If the result (in decimal) is greater
than 99999999 it is made to rollover to 00000000. If the meter is
recording power delivered to the utility, the display displays
decrementing numbers and a rollover from all zero to all nines is
performed.
meansq
copy temp_long+2
to rms_long (16-bit)
copy temp_long+2
to rms_long+2 (16-bit)
call smpy16
16x16 signed multiply
add 32-bit result to
previous squares
return
F
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
n
.
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