ADE7758_15 datasheet(58/72 Pages) AD

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ADE7758

Data Sheet

Rev. E | Page 58 of 72

As explained earlier, the data write is initiated by a write to the

communications register followed by the data. During a data

write operation to the ADE7758, 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 duration before the content

in the serial port buffer is transferred to one of the ADE7758

on-chip registers. Although another byte transfer to the serial

port can start while the previous byte is being transferred to the

destination register, this second-byte transfer should not finish

until at least 900 ns 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 is not written to the destination

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

Accessing the On-Chip Registers section). Therefore, the first

byte shifted into the serial port at DIN is transferred to the most

significant byte (MSB) of the destination register. If the destination

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 ADE7758

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

1A6

DB7

DB0

DB7

DB0

Figure 92. Serial Interface Write Timing Diagram

SCLK

DIN

DB11 DB10

DB9

DB8

DB7

DB6

DB5

DB4

DB3

DB2

DB1

DB0

MOST SIGNIFICANT BYTE

LEAST SIGNIFICANT BYTE

Figure 93. 12-Bit Serial Write Operation

SCLK

t10

t13

DB0

DB7

DB0

DB7

DIN

DOUT

t11

t12

COMMAND BYTE

MOST SIGNIFICANT BYTE

LEAST SIGNIFICANT BYTE

Figure 94. Serial Interface Read Timing Diagram

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