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EVAL-AD74111EB
MASTERRESET:
//this subroutine keeps DIN low during reset for Master Mode
ax0=0x0800; dm(SYS_CTRL_REG)=ax0;
reset FLAG_OUT;
cntr=200; do KT1 until ce;
KT1:
KT2:
nop; //kill time
set fl1; //reset high
cntr=200; do KT2 until ce;
nop; //kill time
rts; //return
16-BIT DATA MODE, 16-BIT DATA, MASTER MODE
This example demonstrates how to program the AD74111 in
mixed mode and then switch to data mode when the
programming is completed. The program uses a data buffer to
store the control words that are sent to the AD74111 and the
initial values that are sent to the DAC. The DAC is programmed
with a midscale value until the AD74111 is put into data mode.
At that point, the ADC results are sent to the DAC to create a
loopback effect. Because the number of control words and DAC
end of the buffer, then a control or DAC value is taken from the
control buffer and transmitted to the AD74111. Address Pointer I0
is automatically incremented by this procedure. If the address
pointer is equal to the last address in the buffer, the program
reads the ADC result that was just received and sends it to the
DAC to create a loopback effect. Because no value was read
from the control buffer, the address pointer is not incremented,
and it will equal the last address of the control buffer for subsequent
interrupts. Figure 7 shows the flowchart for this program.
data-words is known, the program checks the value of Address
Pointer I0 at each received interrupt. If the value is less than the
Rev. 0 | Page 7 of 16
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