PIC18F87J72 datasheet(21/50 Pages) MICROCHIP

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Calculation Engine and Register Description

DS51931A-page 21

3.3

MODE

The MODE register controls the operation of the energy meter. The bit functions are

defined by the table below.

MAXIMUM CURRENT

R/W Maximum current of the meter (IMAX).

CALIBRATION_VOLTAGE

R/W Calibration Voltage of the meter (VCAL).

CALIBRATION_CURRENT

R/W Calibration Current of the meter (ICAL).

CALIBRATION_FREQUENCY

R/W Calibration Frequency of the meter.

METER_CONSTANT

R/W Meter Constant in imp/kWh or imp/kVARh.

CALIBRATION_LINE_CYCLE

R/W Number of line cycles for calibration.

GAIN_DENR_ENERGY_REACT

R/W Reactive Energy Pulse Output correction factor.

GAIN_NUMR_ENERGY_REACT

R/W Reactive Energy Pulse Output correction factor.

PHASE_COMPENSATION_90

R/W Phase delay for Reactive Power.

CREEP_THRSHOLD_MINUTE

R/W No Load threshold time (minutes).

CREEP_THRSHOLD_SECOND

R/W No Load threshold time (seconds).

ENERGY_ACT_FORWARD

R/W Forward Active Energy.

ENERGY_ACT_REVERSE

R/W Reverse Active Energy.

ENERGY_REACT_INDUCTIVE

R/W Inductive Reactive Energy.

ENERGY_REACT_CAPACITIVE

R/W Capacitive Reactive Energy.

TABLE 3-1:

INTERNAL REGISTER SUMMARY (CONTINUED)

Name

Bits

R/W

Description

MODE REGISTER

U-0

R/W-0

—

CREEP

PHASE

ABSOLUTE

bit 7

bit 0

Legend:

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

Unimplemented: Read as ‘0’

bit 3

CREEP: No-Load Threshold bit

Enabled

=Disabled

bit 2

PHASE: Phase bit

Single-Point Phase Correction

Multi-Point Phase Correction (future)

bit 1

ABSOLUTE: Positive Only Energy Accumulation Mode bit

Positive energy only

Both negative and positive energy accumulated (negative energy is subtracted)

bit 0

CF: Active Energy CF Phase Enable bit

Phase is enabled to be accumulated into the total energy registers or CF pulse output

Phase is DISABLED and is not accumulated into the total energy registers or CF pulse output

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