Datasheet

AD7323 Data Sheet
Rev. B | Page 22 of 36
REGISTERS
The AD7323 has three programmable registers: the control
register, sequence register, and range register. These registers
are write-only registers.
ADDRESSING REGISTERS
A serial transfer on the AD7323 consists of 16 SCLK cycles. The
three MSBs on the DIN line during the 16 SCLK transfer are
decoded to determine which register is addressed. The three
MSBs consist of the write bit, the Register Select 1 bit, and the
Register Select 2 bit. The register select bits are used to
determine which of the three on-board registers is selected. The
write bit determines if the data on the DIN line following the
register select bits loads into the addressed register. If the write
bit is 1, the bits load into the register addressed by the register
select bits. If the write bit is 0, the data on the DIN line does not
load into any register.
Combinations of the write bit, the Register Select 1 bit, and the
Register Select 2 bit other than those specified in Table 8 access
registers for Analog Devices internal use only. Accessing these
registers may lead to unspecified operation of the device.
Table 8. Decoding Register Select Bits and Write Bit
Write Register Select 1 Register Select 2 Description
0 0 0 Data on the DIN line during this serial transfer is ignored.
1 0 0
This combination selects the control register. The subsequent 12 bits are loaded into
the control register.
1 0 1
This combination selects the range register. The subsequent eight bits are loaded into
the range register.
1 1 1
This combination selects the sequence register. The subsequent four bits are loaded
into the sequence register.