ADE5166 datasheet(38/156 Pages) AD

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ADE5166/ADE5169/ADE5566/ADE5569

Rev. B | Page 38 of 156

ENERGY MEASUREMENT

The ADE5166/ADE5169/ADE5566/ADE5569 offer a fixed func-

tion, energy measurement, digital processing core that provides

all the information needed to measure energy in single-phase

energy meters. The part provides two ways to access the energy

measurements: direct access through SFRs for time sensitive

information and indirect access through address and data SFRs

for the majority of energy measurements. The Irms, Vrms, interrupt,

and waveform registers are readily available through the SFRs, as

shown in Table 31. Other energy measurement information is

mapped to a page of memory that is accessed indirectly through

the MADDPT, MDATL, MDATM, and MDATH SFRs. The

address and data SFRs act as pointers to the energy measurement

internal registers.

ACCESS TO ENERGY MEASUREMENT SFRs

Access to the energy measurement SFRs is achieved by reading

or writing to the SFR addresses detailed in Table 31. The internal

data for the MIRQx SFRs is latched byte by byte into the SFR

when the SFR is read.

The WAV1x, WAV2x, VRMSx, and IRMSx registers are all 3-byte

SFRs. The 24-bit data is latched into these SFRs when the high

byte is read. Reading the low or medium byte before the high

byte results in reading the data from the previous latched sample.

Sample code to read the VRMSx register is as follows:

MOV

R1, VRMSH

//latches data in VRMSH,

VRMSM, and VRMSL SFRs

MOV

R2, VRMSM

MOV

R3, VRMSL

ACCESS TO INTERNAL ENERGY MEASUREMENT

REGISTERS

Access to the internal energy measurement registers is achieved

by writing to the energy measurement pointer address SFR

(MADDPT, Address 0x91). This SFR selects the energy measure-

ment register to be accessed and determines if a read or a write

is performed (see Table 30).

Table 30. Energy Measurement Pointer Address SFR

(MADDPT, Address 0x91)

Bit

Description

1 = write

0 = read

[6:0]

Energy measurement internal register address

Writing to the Internal Energy Measurement Registers

When Bit 7 of the energy measurement pointer address SFR

(MADDPT, Address 0x91) is set, the contents of the MDATx SFRs

(MDATL, MDATM, and MDATH) are transferred to the internal

energy measurement register designated by the address in the

MADDPT SFR. If the internal register is one byte long, only the

MDATL SFR contents are copied to the internal register. The

MDATM SFR and MDATH SFR contents are ignored.

The energy measurement core functions with an internal clock of

4.096 MHz∕5 or 819.2 kHz. Because the 8052 core functions with

another clock, 4.096 MHz∕2CD, synchronization between the two

clock environments when CD = 0 or 1 is an issue. When data is

written to the internal energy measurement registers, a small

wait period needs to be implemented before another read or

write to these registers can take place.

Sample code to write 0x0155 to the 2-byte SAGLVL register,

located at Address 0x14 in the energy measurement memory

space, is as follows:

MOV

MDATM,#01h

MOV

MDATL,#55h

MOV

MADDPT,#SAGLVL_W (Address 0x94)

MOV

A,#05h

DJNZ

ACC,$

;Next write or read to energy

measurement SFR can be done after

this.

Reading the Internal Energy Measurement Registers

When Bit 7 of energy measurement pointer address SFR

(MADDPT, Address 0x91) is cleared, the contents of the inter-

nal energy measurement register designated by the address in

MADDPT are transferred to the MDATx SFRs. If the internal

updated with a new value. The MDATM SFR and MDATH SFR

contents are reset to 0x00.

The energy measurement core functions with an internal clock

of 4.096 MHz∕5 or 819.2 kHz. Because the 8052 core functions

with another clock, 4.096 MHz∕2CD, synchronization between

the two clock environments is an issue when CD = 0 or CD = 1.

When data is read from the internal energy measurement registers,

a small wait period needs to be implemented before the MDATx

SFRs are transferred to another SFR.

Sample code to read the peak voltage in the 2-byte VPKLVL

follows:

MOV

MADDPT,#VPKLVL_R (Address 0x16)

MOV

A,#05h

DJNZ

ACC,$

MOV

DPH,MDATM

MOV

DPL,MDATL

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