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ADE7759
REGISTER DESCRIPTIONS
All ADE7759 functionality is accessed via the on-chip registers.
Each register is accessed by first writing to the communications
register and then transferring the register data. A full description
of the serial interface protocol is given in the Serial Interface
section.
Communications Register
The communications register is an 8-bit, write-only register
that controls the serial data transfer between the ADE7759 and
the host processor. All data transfer operations must begin with
a write to the communications register. The data written to the
communications register determines whether the next operation
is a read or a write and which register is being accessed. Table V
outlines the bit designations for the communications register.
Table V. Communications Register
DB7
W/ R
DB6
0
DB5
0
DB4
A4
DB3
A3
DB2
A2
DB1
A1
DB0
A0
Bit
Bit
Location
0 to 4
5 to 6
7
Mnemonic
A0 to A4
RESERVED
W/ R
Description
The five LSBs of the communications register specify the register for the data transfer opera-
tion. Table III lists the address of each ADE7759 on-chip register.
These bits are unused and should be set to zero.
When this bit is a Logic 1, the data transfer operation immediately following the write to the
Communications register will be interpreted as a write to the ADE7759. When this bit is a
Logic 0, the data transfer operation immediately following the write to the communications
register will be interpreted as a read operation.
–30 –
REV. A
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