Programming Information
37
Table 3.5.5: Demodulator Carrier Frequency NCO Group Register Definition
Programming
Example
1.
For the programming example given, the following equation must be
evaluated:
Register Value = Demod f
c
x 214.74837
Register Value = 8000 x 214.74837 = 1717986.96
2.
Rounding results as shown below:
Register Value = 1717987
3.
By successively dividing the above value by the bit weight values shown in
Figure 3.5.5
, the appropriate hexadecimal equivalent can be obtained:
Register Value = 001A36E3h
4.
Cleave the results into the four respective registers and write as shown:
Register 03h= 00h
Register 02h= 1Ah
Register 01h= 36h
Register 00h= E3h
Bit No.
Bit Name(s)
Functional Description
31-24
Demod Carrier Frequency
Most significant carrier frequency word (See
Figure
3.5.5
for register assignments)
25-16
Demod Carrier Frequency
Carrier frequency word 3 (See
Figure 3.5.5
for register
assignments)
15-8
Demod Carrier Frequency
Carrier frequency word 2 (See
Figure 3.5.5
for register
assignments)
7-0
Demod Carrier Frequency
Least significant carrier frequency word (See
Figure
3.5.5
for register assignments)
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com