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PIC18F87J72 Single-Phase Energy Meter Reference Design
3.6
LINE_CYC
Name
LINE_CYC
Bits
16
Cof
R/W
Number of line cycles as a power of two. A setting of 0 indicates 2 0 or one line cycle.
A setting of 1 is two line cycles (2 1 ), a setting of 2 is four line cycles (2 2 ), up to a setting
of eight which is 256 line cycles. When written, this register will not take effect until the
previous number of line cycles has been acquired.
3.7
LINE_CYC_CNT
Name
LINE_CYC_CNT
Bits
16
Cof
R
This register counts from 0 and finishes at 2 (LINE_CYC - 1) . Then re-starts at 0, where
LINE_CYC represents the value in the LINE_CYC register.
3.8
RAW2_I_RMS
Name
RAW2_I_RMS
Bits
64
Cof
R
This register is the square of the raw RMS value from the current A/D converter in
LSBs. By definition, this register will always contain a positive value, including the sit-
uation where power is negative from a backwards CT or otherwise. This register is
overwritten every LINE_CYC line cycle (written only once if the calibration is enabled).
3.9
RAW_I_RMS
Name
RAW_I_RMS
Bits
16
Cof
R
This register is the raw RMS value from the current A/D converter in LSBs (square root
of the top 32-bits of (RAW2_I_RMS + OFFSET_I_RMS). By definition, this register will
always contain a positive value (even if the CT is in backwards). This register is over-
written every LINE_CYC line cycle (written only once if the calibration is enabled).
3.10
I_RMS
I_RMS
Name
Bits
16
Cof
R
This register is the RMS value of phase A current in X A/LSB, as determined by the
value in the GAIN_I_RMS register. When displaying the RMS current, multiply the (dec-
imal) value in these registers by X to get the display value in Amperes. This register is
overwritten every LINE_CYC line cycle (written only once if the calibration is enabled).
DS51931A-page 24
? 2011 Microchip Technology Inc.
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