ADE7753ARSZ datasheet(50/60 Pages) AD

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ADE7753

Rev. C | Page 50 of 60

ADE7753 Serial Write Operation

The serial write sequence takes place as follows. With the

ADE7753 in communications mode (i.e., the CS input logic

low), a write to the communications register first takes place.

The MSB of this byte transfer is a 1, indicating that the data

transfer operation is a write. The LSBs of this byte contain the

address of the register to be written to. The ADE7753 starts

shifting in the register data on the next falling edge of SCLK. All

remaining bits of register data are shifted in on the falling edge

of subsequent SCLK pulses—see

. As explained earlier,

the data write is initiated by a write to the communications

the ADE7753, data is transferred to all on-chip registers one

byte at a time. After a byte is transferred into the serial port,

there is a finite time before it is transferred to one of the

ADE7753 on-chip registers. Although another byte transfer to

the serial port can start while the previous byte is being

transferred to an on-chip register, this second byte transfer

Figure 92

should not finish until at least 4 μs after the end of the previous

byte transfer. This functionality is expressed in the timing

specification t6—see Figure 92. If a write operation is aborted

during a byte transfer (CS brought high), then that byte cannot

be written to the destination register.

Destination registers can be up to 3 bytes wide—see the

ADE7753 Register Description tables. Therefore the first byte

shifted into the serial port at DIN is transferred to the MSB

(most significant byte) of the destination register. If, for

example, the addressed register is 12 bits wide, a 2-byte data

transfer must take place. The data is always assumed to be right

justified, therefore in this case, the four MSBs of the first byte

would be ignored and the four LSBs of the first byte written to

the ADE7753 would be the four MSBs of the 12-bit word.

Figure 93 illustrates this example.

DIN

SCLK

COMMAND BYTE

MOST SIGNIFICANT BYTE

LEAST SIGNIFICANT BYTE

DB7

DB0

DB7

DB0

02875-0-081

Figure 92. Serial Interface Write Timing

SCLK

DIN

DB11

DB10

DB9

DB8

DB7

DB6

DB5

DB4

DB3

DB2

DB1

DB0

MOST SIGNIFICANT BYTE

LEAST SIGNIFICANT BYTE

02875-0-082

Figure 93. 12-Bit Serial Write Operation

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