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Calculation Engine and Register Description
TABLE 3-1:
INTERNAL REGISTER SUMMARY (CONTINUED)
Name
Bits
R/W
Description
3.3
MODE
16
16
16
16
16
16
8
16
8
8
8
32
32
32
32
R/W Maximum current of the meter (I MAX ).
R/W Calibration Voltage of the meter (V CAL ).
R/W Calibration Current of the meter (I CAL ).
R/W Calibration Frequency of the meter.
R/W Meter Constant in imp/kWh or imp/kVARh.
R/W Number of line cycles for calibration.
R/W Reactive Energy Pulse Output correction factor.
R/W Reactive Energy Pulse Output correction factor.
R/W Phase delay for Reactive Power.
R/W No Load threshold time (minutes).
R/W No Load threshold time (seconds).
R/W Forward Active Energy.
R/W Reverse Active Energy.
R/W Inductive Reactive Energy.
R/W Capacitive Reactive Energy.
The MODE register controls the operation of the energy meter. The bit functions are
defined by the table below.
REGISTER 3-1:
MODE REGISTER
U-0
—
U-0
—
U-0
—
U-0
—
R/W-0
CREEP
R/W-0
PHASE
R/W-0
ABSOLUTE
R/W-0
CF
bit 7
Legend:
bit 0
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
bit 7-4
bit 3
bit 2
bit 1
bit 0
Unimplemented: Read as ‘ 0 ’
CREEP: No-Load Threshold bit
1 = Enabled
0 = Disabled
PHASE: Phase bit
1 = Single-Point Phase Correction
0 = Multi-Point Phase Correction (future)
ABSOLUTE: Positive Only Energy Accumulation Mode bit
1 = Positive energy only
0 = Both negative and positive energy accumulated (negative energy is subtracted)
CF: Active Energy CF Phase Enable bit
1 = Phase is enabled to be accumulated into the total energy registers or CF pulse output
0 = Phase is DISABLED and is not accumulated into the total energy registers or CF pulse output
? 2011 Microchip Technology Inc.
DS51931A-page 21
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