S9408
RECALL COMMAND
The recall command will retrieve data from the selected
nonvolatile register and write it into the data register of the
associated DAC. This operation is initiated by taking CS#
low and clocking in a start bit followed by the recall
command and the address of the nonvolatile register to be
recalled. The eight bits of data are don’t care, so CS# can
be taken high any time after the address bits are clocked
in. Refer to Figure 4 for an illustration of the sequence of
bus conditions for a Recall operation.
Power-on recall
Whenever the S9408 is powered on the DAC output
values will be returned to the selected default setting. The
default setting can be the nonvolatile register contents or
all zeroes. The state of the 00/REG# pin will determine
which operation will be performed. If it is tied to ground (or
left floating) the nonvolatile register contents will be re-
called. Conversely, if it is tied to V
DD
the S9408 will recall
zeroes.
CS#
CLK
DI
S
T
A
R
T
C1
C0
A1
A0
V
OUT
2015 T fig04 2.0
FIGURE 4. RECALL COMMAND SEQUENCE
2015 2.2 8/2/00
SUMMIT MICROELECTRONICS, Inc.
5
SUMMIT [ SUMMIT MICROELECTRONICS, INC. ]
