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ADE7758
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.
Data Sheet
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
register is 12 bits wide, for example, a two-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 ADE7758
would be the four MSBs of the 12-bit word. Figure 93 illustrates
this example.
This functionality is expressed in the timing specification t 6 (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
register.
t 8
CS
SCLK
t 1
t 3
t 7
t 7
t 6
t 2
t 4
t 5
DIN
1
A6
A5
A4
A3
A2
A1
A0
DB7
DB0
DB7
DB0
COMMAND BYTE
MOST SIGNIFICANT BYTE
LEAST SIGNIFICANT BYTE
Figure 92. Serial Interface Write Timing Diagram
SCLK
DIN
X
X
X
X
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
CS
t 1
t 13
SCLK
t 9
t 10
DIN
0
A6
A5
A4
A3
A2
A1
A0
t 11
t 12
DOUT
DB7
DB0
DB7
DB0
COMMAND BYTE
MOST SIGNIFICANT BYTE
Figure 94. Serial Interface Read Timing Diagram
Rev. E | Page 58 of 72
LEAST SIGNIFICANT BYTE
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