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ADE7754
t 8
CS
SCLK
t 1
t 2 t 3
t 4
t 5
t 7
t 7
t 6
DIN
1
0
A5
A4
A3
A2
A1
A0
DB7
DB0
DB7
DB0
COMMAND BYTE
MOST SIGNIFICANT BYTE
LEAST SIGNIFICANT BYTE
Figure 44. 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 45. 12-Bit Serial Write Operation
Serial Read Operation
During a data read operation from the ADE7754, data is shifted
out at the DOUT logic output on the rising edge of SCLK. As
was the case with the data write operation, a data read must be
preceded by a write to the communications register.
With the ADE7754 in communications mode and CS logic low,
an 8-bit write to the communications register first takes place.
The MSB of this byte transfer must be a 0, indicating that the
next data transfer operation is a read. The six LSBs of this byte
contain the address of the register to be read. The ADE7754
starts shifting out of the register data on the next rising edge of
SCLK. See Figure 46. At this point, the DOUT logic output
switches from high impedance state and starts driving the data
bus. All remaining bits of register data are shifted out on subsequent
SCLK rising edges. The serial interface enters communications
CS
t 1
SCLK
t 9
mode again as soon as the read has been completed. The DOUT
logic output enters a high impedance state on the falling edge of
the last SCLK pulse. The read operation may be aborted by
bringing the CS logic input high before the data transfer is com-
pleted. The DOUT output enters a high impedance state on the
rising edge of CS .
When an ADE7754 register is addressed for a read operation,
the entire contents of that register are transferred to the serial
port. This allows the ADE7754 to modify its on-chip registers
without the risk of corrupting data during a multibyte transfer.
Note that when a read operation follows a write operation, the
read command (i.e., write to communications register) should
not happen for at least 1 μ s after the end of the write operation.
If the read command is sent within 1 μ s of the write operation,
the last byte of the write operation may be lost.
t 10
DIN
0
0
A5
A4
A3
A2
A1
A0
t 11
t 12
t 13
DOUT
DB7
DB0
DB7
DB0
COMMAND BYTE
MOST SIGNIFICANT BYTE
LEAST SIGNIFICANT BYTE
Figure 46. Serial Interface Read Timing Diagram
REV. 0
–29 –
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