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44-Pin Demo Board User’s Guide
FIGURE 3-10:
SWAPF INSTRUCTION
Before
After
1 0 1 0
0 0 1 1
0 0 1 1
1 0 1 0
3.2.11
Lesson 11: Indirect Data Addressing
The FSR (File Select Register) allows a file register address to be specified. A subse-
quent read or write to the INDF (Indirect File register) refers to the file register
addressed by the FSR.
This may be used to implement a moving average filter. The moving average keeps a
list of the last n values and averages them together. The Filter needs two parts: A
circular queue and a function to calculate the average.
FIGURE 3-11:
Conceptual View
Time
MOVING AVERAGES
Average
n
n+1
n+2
105
106
110
102
105
106
101
102
105
104
101
102
99
104
101
103
99
104
105
103
99
107
105
103
103
103
104
The rest move down one
Newest value inserted here
Implementation View
Time
Average
n
107
105
101
104
99
101
102
105
103
Pointer to oldest value
n+1
106
105
102
101
99
101
102
105
103
Older value overwritten, pointer advanced
n+2
106
110
103 99 99 101 102 105
104
Pointer advanced
Calculating averages in a mid-range PIC microcontroller is best accomplished by using
the FSR to keep track of where the next value will be inserted. This ensures the oldest
value is always overwritten with the newest and doesn’t waste time moving values
within the memory.
DS41296B-page 30
? 2007 Microchip Technology Inc.
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