Motorola DSP56156 Manual page 181

terrupt routine can be used to perform these two functions since the two codec sections
(A/D and D/A) are synchronous.
The time the DSP core spends on the decimation/compensation and interpolation/com-
pensation filters is a function of:
• the antialiasing and reconstruction filter characteristics
• the characteristic of the compensation that needs to be performed
• the master DSP core clock speed
• the number of registers that need to be saved and restored
• the number and size of general tasks handled by the interrupt routine itself
Figure 6-39 shows an example of a flowchart for a long interrupt routine.
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DSP PROGRAM FLOWCHART
DSP56156 ON-CHIP SIGMA/DELTA CODEC MOTOROLA