ADE5166 datasheet(33/148 Pages) AD

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Preliminary Technical Data

ADE5166/ADE5169/ADE5566/ADE5569

Rev. PrB | Page 33 of 148

ENERGY MEASUREMENT

The ADE5166/ADE5169/ADE5566/ADE5569 offer a fixed

function, 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 SFR registers for the majority of energy measurements.

The Irms, Vrms, interrupts, and waveform registers are readily

available through SFRs, as shown in Table 30. 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 registers 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 30. The internal

data for the MIRQx SFRs are 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, 0x91). This SFR selects the energy measurement

performed (see Table 29).

Table 29. Energy Measurement Pointer Address SFR

(MADDPT, 0x91)

Bit

Description

1 = write, 0 = read

6 to 0

Energy measurement internal register address

Writing to the Internal Energy Measurement Registers

When Bit 7 of the energy measurement pointer address SFR

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

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

energy measurement register designated by the address in the

MADDPT SFR. If the internal register is 1 byte long, only the

MDATL SFR content is copied to the internal register, while 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, 4.096MHz ∕ 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 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, 0x91) is cleared, the content of the internal energy

measurement register designated by the address in MADDPT

is transferred to the MDATx SFRs. If the internal register is

1 byte long, only the MDATL SFR content is updated with a

new value, while 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, 4.096MHz ∕ 2CD, synchronization between

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

MOV

MADDPT,#VPKLVL_R (Address 0x16)

MOV

A,#05h

DJNZ

ACC,$

MOV

DPH,MDATM

MOV

DPL,MDATL

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